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Python News
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What's New in Python 3.2 Alpha 3?
=================================

*Release date: XX-Oct-2010*

Core and Builtins
-----------------

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- Issue #9738: Document PyErr_SetString() and PyErr_SetFromErrnoWithFilename()
  encodings

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- ast.literal_eval() can now handle negative numbers.  It is also a little
  more liberal in what it accepts without compromising the safety of the
  evaluation.  For example, 3j+4 and 3+4+5 are both accepted.

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- Issue #10006: type.__abstractmethods__ now raises an AttributeError.  As a
  result metaclasses can now be ABCs (see #9533).

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- Issue #8670: ctypes.c_wchar supports non-BMP characters with 32 bits wchar_t.

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- Issue #8670: PyUnicode_AsWideChar() and PyUnicode_AsWideCharString() replace
  UTF-16 surrogate pairs by single non-BMP characters for 16 bits Py_UNICODE
  and 32 bits wchar_t (eg. Linux in narrow build).

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- Issue #10003: Allow handling of SIGBREAK on Windows. Fixes a regression
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  introduced by issue #9324.
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- Issue #9979: Create function PyUnicode_AsWideCharString().

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- Issue #7397: Mention that importlib.import_module() is probably what someone
  really wants to be using in __import__'s docstring.

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- Issue #8521: Allow CreateKeyEx, OpenKeyEx, and DeleteKeyEx functions
  of winreg to use named arguments.

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- Issue #9930: Remove bogus subtype check that was causing (e.g.)
  float.__rdiv__(2.0, 3) to return NotImplemented instead of the
  expected 1.5.

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- Issue #9808: Implement os.getlogin for Windows. Patch by Jon Anglin.

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- Issue #9901: Destroying the GIL in Py_Finalize() can fail if some other
  threads are still running.  Instead, reinitialize the GIL on a second call to
  Py_Initialize().

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- All SyntaxErrors now have a column offset and therefore a caret when the
  error is printed.
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- Issue #9252: PyImport_Import no longer uses a fromlist hack to return the
  module that was imported, but instead gets the module from sys.modules.

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- Issue #9212: The range type_items now provides index() and count()
  methods, to conform to the Sequence ABC.  Patch by Daniel Urban and
  Daniel Stutzbach.

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- Issue #7994: Issue a PendingDeprecationWarning if object.__format__
  is called with a non-empty format string. This is an effort to
  future-proof user code. If a derived class does not currently
  implement __format__ but later adds its own __format__, it would
  most likely break user code that had supplied a format string. This
  will be changed to a DeprecationWaring in Python 3.3 and it will be
  an error in Python 3.4.

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- Issue #9828: Destroy the GIL in Py_Finalize(), so that it gets properly
  re-created on a subsequent call to Py_Initialize().  The problem (a crash)
  wouldn't appear in 3.1 or 2.7 where the GIL's structure is more trivial.

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- Issue #9210: Configure option --with-wctype-functions was removed.  Using the
  functions from the libc caused the methods .upper() and lower() to become
  locale aware and created subtly wrong results.

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- Issue #9738: PyUnicode_FromFormat() and PyErr_Format() raise an error on
  a non-ASCII byte in the format string.

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- Issue #4617: Previously it was illegal to delete a name from the local
  namespace if it occurs as a free variable in a nested block.  This limitation
  of the compiler has been lifted, and a new opcode introduced (DELETE_DEREF).

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- Issue #9804: ascii() now always represents unicode surrogate pairs as
  a single ``\UXXXXXXXX``, regardless of whether the character is printable
  or not.  Also, the "backslashreplace" error handler now joins surrogate
  pairs into a single character on UCS-2 builds.

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- Issue #9757: memoryview objects get a release() method to release the
  underlying buffer (previously this was only done when deallocating the
  memoryview), and gain support for the context management protocol.

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- Issue #9797: pystate.c wrongly assumed that zero couldn't be a valid
  thread-local storage key.

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Library
-------

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- Issue #4661: email can now parse bytes input and generate either converted
  7bit output or bytes output.  Email version bumped to 5.1.0.

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- Issue #1589: Add ssl.match_hostname(), to help implement server identity
  verification for higher-level protocols.

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- Issue #9759: GzipFile now raises ValueError when an operation is attempted
  after the file is closed.  Patch by Jeffrey Finkelstein.

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- Issue #9042: Fix interaction of custom translation classes and caching in
  gettext.

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- Issue #6706: asyncore.dispatcher now provides a handle_accepted() method
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  returning a (sock, addr) pair which is called when a connection has been
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  established with a new remote endpoint. This is supposed to be used as a
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  replacement for old handle_accept() and avoids the user to call accept()
  directly.

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- Issue #9065: tarfile no longer uses "root" as the default for the uname and
  gname field.

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- Issue #8980: Fixed a failure in distutils.command check that was shadowed
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  by an environment that does not have docutils. Patch by Arfrever.
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- Issue #1050268: parseaddr now correctly quotes double quote and backslash
  characters that appear inside quoted strings in email addresses.

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- Issue #10004: quoprimime no longer generates a traceback when confronted
  with invalid characters after '=' in a Q-encoded word.

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- Issue #1491: BaseHTTPServer nows send a 100 Continue response before sending
  a 200 OK for the Expect: 100-continue request header.

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- Issue #9360: Cleanup and improvements to the nntplib module.  The API
  now conforms to the philosophy of bytes and unicode separation in Python 3.
  A test suite has also been added.

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- Issue #9962: GzipFile now has the peek() method.

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- Issue #9090: When a socket with a timeout fails with EWOULDBLOCK or EAGAIN,
  retry the select() loop instead of bailing out.  This is because select()
  can incorrectly report a socket as ready for reading (for example, if it
  received some data with an invalid checksum).

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- Issue #3612: Added new types to ctypes.wintypes. (CHAR and pointers)

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- Issue #9950: Fix socket.sendall() crash or misbehaviour when a signal is
  received.  Now sendall() properly calls signal handlers if necessary,
  and retries sending if these returned successfully, including on sockets
  with a timeout.

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- Issue #9947: logging: Fixed locking bug in stopListening.

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- Issue #9945: logging: Fixed locking bugs in addHandler/removeHandler.

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- Issue #9936: Fixed executable lines' search in the trace module.

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- Issue #9790: Rework imports necessary for samefile and sameopenfile
  in ntpath.

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- Issue #9928: Properly initialize the types exported by the bz2 module.

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- Issue #1675951: Allow GzipFile to work with unseekable file objects.
  Patch by Florian Festi.

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- Logging: Added QueueListener class to facilitate logging usage for
  performance-critical threads.

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- Issue #9916: Add some missing errno symbols.

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- Issue #9877: Expose sysconfig.get_makefile_filename()

- logging: Added hasHandlers() method to Logger and LoggerAdapter.

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- Issue #9908: Fix os.stat() on bytes paths under Windows 7.

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- Issue #2643: msync() is not called anymore when deallocating an open mmap
  object, only munmap().

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- logging: Changed LoggerAdapter implementation internally, to make it
  easier to subclass in a useful way.

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- logging: hasHandlers method was added to Logger, and isEnabledFor,
  getEffectiveLevel, hasHandlers and setLevel were added to LoggerAdapter.
  LoggerAdapter was introduced into the unit tests for logging.

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- Issue #1686: Fix string.Template when overriding the pattern attribute.

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- Issue #9854: SocketIO objects now observe the RawIOBase interface in
  non-blocking mode: they return None when an operation would block (instead
  of raising an exception).

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- Issue #1730136: Fix the comparison between a tk.font.Font and an object of
  another kind.

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- Issue #9441: logging has better coverage for rotating file handlers.

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- Issue #9865:  collections.OrderedDict now has a __sizeof__ method.

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- Issue #9854: The default read() implementation in io.RawIOBase now
  handles non-blocking readinto() returning None correctly.

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- Issue #1552: socket.socketpair() now returns regular socket.socket
  objects supporting the whole socket API (rather than the "raw"
  _socket.socket objects).

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- Issue #9853: Fix the signature of SSLSocket.recvfrom() and
  SSLSocket.sendto() to match the corresponding socket methods.

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- Issue 9840: Added a decorator to reprlib for wrapping __repr__ methods
  to make them handle recursive calls within the same thread.

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- logging: Enhanced HTTPHandler with secure and credentials initializers.

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- Issue #767645: Set os.path.supports_unicode_filenames to True on Mac OS X.
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- Issue #9837: The read() method of ZipExtFile objects (as returned by
  ZipFile.open()) could return more bytes than requested.

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- Issue #9826: OrderedDict.__repr__ can now handle self-referential
  values:   d['x'] = d.

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- Issue #9825: Using __del__ in the definition of collections.OrderedDict made
  it possible for the user to create self-referencing ordered dictionaries
  which become permanently uncollectable GC garbage. Reinstated the Py3.1
  approach of using weakref proxies so that reference cycles never get created
  in the first place.

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- Issue #9579, #9580: Fix os.confstr() for value longer than 255 bytes and
  encode the value with filesystem encoding and surrogateescape (instead of
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  utf-8 in strict mode). Patch written by David Watson.
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- Issue #9632: Remove sys.setfilesystemencoding() function: use
  PYTHONFSENCODING environment variable to set the filesystem encoding at
  Python startup. sys.setfilesystemencoding() creates inconsistencies because
  it is unable to reencode all filenames in all objects.

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- Issue #9410: Various optimizations to the pickle module, leading to
  speedups up to 4x (depending on the benchmark).  Mostly ported from
  Unladen Swallow; initial patch by Alexandre Vassalotti.

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- The pprint module now supports printing OrderedDicts in their given
  order (formerly, it would sort the keys).

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- Logging: Added QueueHandler class to facilitate logging usage with
  multiprocessing.

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- Issue #9707: Rewritten reference implementation of threading.local which
  is friendlier towards reference cycles.  This change is not normally
  visible since an optimized C implementation (_thread._local) is used
  instead.

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- Issue #6394: os.getppid() is now supported on Windows.  Note that it will
  still return the id of the parent process after it has exited.  This process
  id may even have been reused by another unrelated process.

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- Issue #9792: In case of connection failure, socket.create_connection()
  would swallow the exception and raise a new one, making it impossible
  to fetch the original errno, or to filter timeout errors.  Now the
  original error is re-raised.

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- Issue #9758: When fcntl.ioctl() was called with mutable_flag set to True,
  and the passed buffer was exactly 1024 bytes long, the buffer wouldn't
  be updated back after the system call.  Original patch by Brian Brazil.

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- Updates to the random module:

  * Document which parts of the module are guaranteed to stay the same
    across versions and which parts are subject to change.

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  * Update the seed() method to use all of the bits in a string
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    instead of just the hash value.  This makes better use of the
    seed value and assures the seeding is platform independent.
    Issue #7889.

  * Improved the random()-->integer algorithm used in choice(),
    shuffle(), sample(), randrange(), and randint().  Formerly, it
    used int(n*random()) which has a slight bias whenever n is not
    a power of two.  Issue #9025.

  * Improved documentation of arguments to randrange().  Issue #9379.
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- collections.OrderedDict now supports a new method for repositioning
  keys to either end.

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- Issue #9754: Similarly to assertRaises and assertRaisesRegexp, unittest
  test cases now also have assertWarns and assertWarnsRegexp methods to
  check that a given warning type was triggered by the code under test.

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- Issue #5506: BytesIO objects now have a getbuffer() method exporting a
  view of their contents without duplicating them.  The view is both readable
  and writable.

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- Issue #7566: Implement os.path.sameopenfile for Windows.

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- Issue #9293: I/O streams now raise ``io.UnsupportedOperation`` when an
  unsupported operation is attempted (for example, writing to a file open
  only for reading).

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- hashlib has two new constant attributes: algorithms_guaranteed and
  algorithms_avaiable that respectively list the names of hash algorithms
  guaranteed to exist in all Python implementations and the names of hash
  algorithms available in the current process.

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- A new package ``concurrent.futures`` as defined by PEP 3148.

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C-API
-----

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- Add PyErr_SyntaxLocationEx, which supports passing a column offset.

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- Issue #9834: Don't segfault in PySequence_GetSlice, PySequence_SetSlice, or
  PySequence_DelSlice when the object doesn't have any mapping operations
  defined.

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Tools/Demos
-----------

- Issue #9188: The gdb extension now handles correctly narrow (UCS2) as well
  as wide (UCS4) unicode builds for both the host interpreter (embedded
  inside gdb) and the interpreter under test.

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Tests
-----

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- Issue #1051: Add a script (Lib/test/make_ssl_certs.py) to generate the
  custom certificate and private key files used by SSL-related certs.

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- Issue #9978: Wait until subprocess completes initialization. (Win32KillTests
  in test_os)

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- Issue #7110: regrtest now sends test failure reports and single-failure
  tracebacks to stderr rather than stdout.

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- Issue #9628: fix runtests.sh -x option so more than one test can be excluded.

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- Issue #9899: Fix test_tkinter.test_font on various platforms.  Patch by
  Ned Deily.

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- Issue #9894: Do not hardcode ENOENT in test_subprocess.

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- Issue #9315: Added tests for the trace module.  Patch by Eli Bendersky.

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- Issue #9323: Make test.regrtest.__file__ absolute, this was not always the
  case when running profile or trace, for example.

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- Issue #9568: Fix test_urllib2_localnet on OS X 10.3.

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Build
-----

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- Issue #10055: Make json C89-compliant in UCS4 mode.

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- Issue #9552: Avoid unnecessary rebuild of OpenSSL. (Windows)

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- Issue #1633863: Don't ignore $CC under AIX.

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- Issue #9810: Compile bzip2 source files in python's project file
  directly. It used to be built with bzip2's makefile.

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- Issue #9848: Stopping trying to build _weakref in setup.py as it is a
  built-in module.

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- Issue #9806: python-config now has an ``--extension-suffix`` option that
  outputs the suffix for dynamic libraries including the ABI version name
  defined by PEP 3149.

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- Issue #941346: Improve the build process under AIX and allow Python to
  be built as a shared library.  Patch by Sébastien Sablé.

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- Issue #4026: Make the fcntl extension build under AIX.  Patch by Sébastien
  Sablé.

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- Issue #9701: The MacOSX installer can patch the shell profile to ensure that
  the "bin" directory inside the framework is on the shell's search path. This
  feature now also supports the ZSH shell.

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What's New in Python 3.2 Alpha 2?
=================================

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*Release date: 05-Sep-2010*
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Core and Builtins
-----------------

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- Issue #9225: Remove the ROT_FOUR and DUP_TOPX opcode, the latter replaced by
  the new (and simpler) DUP_TOP_TWO.  Performance isn't changed, but our
  bytecode is a bit simplified.  Patch by Demur Rumed.
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- Issue #9766: Rename poorly named variables exposed by _warnings to prevent
  confusion with the proper variables names from 'warnings' itself.

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- Issue #9212: dict_keys and dict_items now provide the isdisjoint() method, to
  conform to the Set ABC.  Patch by Daniel Urban.
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- Issue #9737: Fix a crash when trying to delete a slice or an item from a
  memoryview object.
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- Issue #9549: sys.setdefaultencoding() and PyUnicode_SetDefaultEncoding() are
  now removed, since their effect was inexistent in 3.x (the default encoding is
  hardcoded to utf-8 and cannot be changed).
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- Issue #7415: PyUnicode_FromEncodedObject() now uses the new buffer API
  properly.  Patch by Stefan Behnel.

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- Issue #5553: The Py_LOCAL_INLINE macro now results in inlining on most
  platforms.  Previously, it inlined only when using Microsoft Visual C.
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- Issue #9712: Fix tokenize on identifiers that start with non-ascii names.

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- Issue #9688: __basicsize__ and __itemsize__ must be accessed as Py_ssize_t.

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- Issue #9684: Added a definition for SIZEOF_WCHAR_T to PC/pyconfig.h, to match
  the pyconfig.h generated by configure on other systems.
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- Issue #9666: Only catch AttributeError in hasattr(). All other exceptions that
  occur during attribute lookup are now propagated to the caller.
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- Issue #8622: Add PYTHONFSENCODING environment variable to override the
  filesystem encoding.

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- Issue #5127: The C functions that access the Unicode Database now accept and
  return characters from the full Unicode range, even on narrow unicode builds
  (Py_UNICODE_TOLOWER, Py_UNICODE_ISDECIMAL, and others).  A visible difference
  in Python is that unicodedata.numeric() now returns the correct value for
  large code points, and repr() may consider more characters as printable.

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- Issue #9425: Create PyModule_GetFilenameObject() function to get the filename
  as a unicode object, instead of a byte string. Function needed to support
  unencodable filenames. Deprecate PyModule_GetFilename() in favor on the new
  function.

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- Issue #8063: Call _PyGILState_Init() earlier in Py_InitializeEx().

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- Issue #9612: The set object is now 64-bit clean under Windows.

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- Issue #8202: sys.argv[0] is now set to '-m' instead of '-c' when searching for
  the module file to be executed with the -m command line option.
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- Issue #9599: Create PySys_FormatStdout() and PySys_FormatStderr() functions to
  write a message formatted by PyUnicode_FromFormatV() to sys.stdout and
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  sys.stderr.

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- Issue #9542: Create PyUnicode_FSDecoder() function, a ParseTuple converter:
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  decode bytes objects to unicode using PyUnicode_DecodeFSDefaultAndSize(); str
  objects are output as-is.
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- Issue #9203: Computed gotos are now enabled by default on supported compilers
  (which are detected by the configure script).  They can still be disable
  selectively by specifying --without-computed-gotos.
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- Issue #9425: Create PyErr_WarnFormat() function, similar to PyErr_WarnEx() but
  use PyUnicode_FromFormatV() to format the warning message.
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- Issue #8530: Prevent stringlib fastsearch from reading beyond the front of an
  array.
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- Issue #5319: Print an error if flushing stdout fails at interpreter shutdown.
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- Issue #9337: The str() of a float or complex number is now identical to its
  repr().
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- Issue #9416: Fix some issues with complex formatting where the output with no
  type specifier failed to match the str output:
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    - format(complex(-0.0, 2.0), '-') omitted the real part from the output,
    - format(complex(0.0, 2.0), '-') included a sign and parentheses.

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Extensions
----------

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- Issue #6608: time.asctime is now checking struct tm fields its input
  before passing it to the system asctime.  Patch by MunSic Jeong.

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- Issue #8734: Avoid crash in msvcrt.get_osfhandle() when an invalid file
  descriptor is provided.  Patch by Pascal Chambon.

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- Issue #7736: Release the GIL around calls to opendir() and closedir() in the
  posix module.  Patch by Marcin Bachry.
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- Issue #4835: make PyLong_FromSocket_t() and PyLong_AsSocket_t() private to the
  socket module, and fix the width of socket descriptors to be correctly
  detected under 64-bit Windows.
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- Issue #1027206: Support IDNA in gethostbyname, gethostbyname_ex, getaddrinfo
  and gethostbyaddr.  getnameinfo is now restricted to numeric addresses as
  input.
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- Issue #9214: Set operations on a KeysView or ItemsView in collections now
  correctly return a set.  Patch by Eli Bendersky.
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- Issue #5737: Add Solaris-specific mnemonics in the errno module.  Patch by
  Matthew Ahrens.

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- Restore GIL in nis_cat in case of error. Decode NIS data to fs encoding, using
  the surrogate error handler.
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- Issue #665761: ``functools.reduce()`` will no longer mask exceptions other
  than ``TypeError`` raised by the iterator argument.
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- Issue #9570: Use PEP 383 decoding in os.mknod and os.mkfifo.

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- Issue #6915: Under Windows, os.listdir() didn't release the Global Interpreter
  Lock around all system calls.  Original patch by Ryan Kelly.
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- Issue #8524: Add a detach() method to socket objects, so as to put the socket
  into the closed state without closing the underlying file descriptor.
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- Issue #477863: Print a warning at shutdown if gc.garbage is not empty.

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- Issue #6869: Fix a refcount problem in the _ctypes extension.

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- Issue #5504: ctypes should now work with systems where mmap can't be
  PROT_WRITE and PROT_EXEC.
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- Issue #9507: Named tuple repr will now automatically display the right name in
  a tuple subclass.
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- Issue #9324: Add parameter validation to signal.signal on Windows in order to
  prevent crashes.
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- Issue #9526: Remove some outdated (int) casts that were preventing the array
  module from working correctly with arrays of more than 2**31 elements.
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- Fix memory leak in ssl._ssl._test_decode_cert.

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- Issue #8065: Fix memory leak in readline module (from failure to free the
  result of history_get_history_state()).
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- Issue #9450: Fix memory leak in readline.replace_history_item and
  readline.remove_history_item for readline version >= 5.0.

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- Issue #8105: Validate file descriptor passed to mmap.mmap on Windows.

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- Issue #8046: Add context manager protocol support and .closed property to mmap
  objects.
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Library
-------

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- Issue #7451: Improve decoding performance of JSON objects, and reduce the
  memory consumption of said decoded objects when they use the same strings as
  keys.
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- Issue #1100562: Fix deep-copying of objects derived from the list and dict
  types.  Patch by Michele Orrù and Björn Lindqvist.
545

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- Issue #9753: Fixed socket.dup, which did not always work correctly on Windows.
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- Issue #9421: Made the get<type> methods consistently accept the vars and
  default arguments on all parser classes.
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- Issue #7005: Fixed output of None values for RawConfigParser.write and
  ConfigParser.write.

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- Issue #8990: array.fromstring() and array.tostring() get renamed to
  frombytes() and tobytes(), respectively, to avoid confusion.  Furthermore,
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  array.frombytes(), array.extend() as well as the array.array() constructor now
  accept bytearray objects.  Patch by Thomas Jollans.
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- Issue #808164: Fixed socket.close to avoid references to globals, to avoid
  issues when socket.close is called from a __del__ method.
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- Issue #9706: ssl module provides a better error handling in various
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  circumstances.

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- Issue #1868: Eliminate subtle timing issues in thread-local objects by getting
  rid of the cached copy of thread-local attribute dictionary.
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- Issue #1512791: In setframerate() in the wave module, non-integral frame rates
  are rounded to the nearest integer.
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- Issue #8797: urllib2 does a retry for Basic Authentication failure instead of
  falling into recursion.

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- Issue #1194222: email.utils.parsedate now returns RFC2822 compliant four
  character years even if the message contains RFC822 two character years.

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- Issue #8750: Fixed MutableSet's methods to correctly handle reflexive
  operations on its self, namely x -= x and x ^= x.
579

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- Issue #9129: smtpd.py is vulnerable to DoS attacks deriving from missing error
  handling when accepting a new connection.
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- Issue #9601: ftplib now provides a workaround for non-compliant
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  implementations such as IIS shipped with Windows server 2003 returning invalid
  response codes for MKD and PWD commands.
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- Issue #658749: asyncore's connect() method now correctly interprets winsock
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  errors.
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- Issue #9501: Fixed logging regressions in cleanup code.

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- Fix functools.total_ordering() to skip methods inherited from object.
593

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- Issue #9572: Importlib should not raise an exception if a directory it thought
  it needed to create was done concurrently by another process.
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- Issue #9617: Signals received during a low-level write operation aren't
  ignored by the buffered IO layer anymore.

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- Issue #843590: Make "macintosh" an alias to the "mac_roman" encoding.

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- Create os.fsdecode(): decode from the filesystem encoding with surrogateescape
  error handler, or strict error handler on Windows.
604

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- Issue #3488: Provide convenient shorthand functions ``gzip.compress`` and
  ``gzip.decompress``.  Original patch by Anand B. Pillai.
607

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- Issue #8807: poplib.POP3_SSL class now accepts a context parameter, which is a
  ssl.SSLContext object allowing bundling SSL configuration options,
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  certificates and private keys into a single (potentially long-lived)
  structure.

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- Issue #8866: parameters passed to socket.getaddrinfo can now be specified as
  single keyword arguments.

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- Address XXX comment in dis.py by having inspect.py prefer to reuse the dis.py
  compiler flag values over defining its own.
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- Issue #9147: Added dis.code_info() which is similar to show_code() but returns
  formatted code information in a string rather than displaying on screen.
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- Issue #9567: functools.update_wrapper now adds a __wrapped__ attribute
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  pointing to the original callable.
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- Issue #3445: functools.update_wrapper now tolerates missing attributes on
  wrapped callables.
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- Issue #5867: Add abc.abstractclassmethod and abc.abstractstaticmethod.

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- Issue #9605: posix.getlogin() decodes the username with file filesystem
  encoding and surrogateescape error handler. Patch written by David Watson.

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- Issue #9604: posix.initgroups() encodes the username using the fileystem
  encoding and surrogateescape error handler. Patch written by David Watson.

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- Issue #9603: posix.ttyname() and posix.ctermid() decode the terminal name
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  using the filesystem encoding and surrogateescape error handler. Patch written
  by David Watson.
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- Issue #7647: The posix module now has the ST_RDONLY and ST_NOSUID constants,
  for use with the statvfs() function.  Patch by Adam Jackson.
642

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- Issue #8688: MANIFEST files created by distutils now include a magic comment
  indicating they are generated.  Manually maintained MANIFESTs without this
  marker will not be overwritten or removed.
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- Issue #7467: when reading a file from a ZIP archive, its CRC is checked and a
  BadZipfile error is raised if it doesn't match (as used to be the case in
  Python 2.5 and earlier).
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- Issue #9550: a BufferedReader could issue an additional read when the original
  read request had been satisfied, which could block indefinitely when the
  underlying raw IO channel was e.g. a socket.  Report and original patch by
  Jason V. Miller.
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- Issue #3757: thread-local objects now support cyclic garbage collection.
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  Thread-local objects involved in reference cycles will be deallocated timely
  by the cyclic GC, even if the underlying thread is still running.
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- Issue #9452: Add read_file, read_string, and read_dict to the configparser
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  API; new source attribute to exceptions.

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- Issue #6231: Fix xml.etree.ElementInclude to include the tail of the current
  node.
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- Issue #8047: Fix the xml.etree serializer to return bytes by default.  Use
  ``encoding="unicode"`` to generate a Unicode string.

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- Issue #8280: urllib2's Request method will remove fragments in the url.  This
  is how it is supposed to work, wget and curl do the same.  Previous behavior
  was wrong.
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- Issue #6683: For SMTP logins we now try all authentication methods advertised
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  by the server.  Many servers are buggy and advertise authentication methods
  they do not support in reality.
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- Issue #8814: function annotations (the ``__annotations__`` attribute) are now
  included in the set of attributes copied by default by functools.wraps and
  functools.update_wrapper.  Patch by Terrence Cole.
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- Issue #2944: asyncore doesn't handle connection refused correctly.

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- Issue #4184: Private attributes on smtpd.SMTPChannel made public and deprecate
  the private attributes. Add tests for smtpd module.
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- Issue #3196: email header decoding is now forgiving if an RFC2047 encoded word
  encoded in base64 is lacking padding.
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- Issue #9444: Argparse now uses the first element of prefix_chars as the option
  character for the added 'h/help' option if prefix_chars does not contain a
  '-', instead of raising an error.
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- Issue #7372: Fix pstats regression when stripping paths from profile data
  generated with the profile module.
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- Issue #9428: Fix running scripts with the profile/cProfile modules from the
  command line.
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- Issue #7781: Fix restricting stats by entry counts in the pstats interactive
  browser.
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- Issue #9209: Do not crash in the pstats interactive browser on invalid regular
  expressions.
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- Update collections.OrderedDict to match the implementation in Py2.7 (based on
  lists instead of weakly referenced Link objects).
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- Issue #8397: Raise an error when attempting to mix iteration and regular reads
  on a BZ2File object, rather than returning incorrect results.
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- Issue #9448: Fix a leak of OS resources (mutexes or semaphores) when
  re-initializing a buffered IO object by calling its ``__init__`` method.

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- Issue #1713: Fix os.path.ismount(), which returned true for symbolic links
  across devices.

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- Issue #8826: Properly load old-style "expires" attribute in http.cookies.

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- Issue #1690103: Fix initial namespace for code run with trace.main().

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- Issue #7395: Fix tracebacks in pstats interactive browser.

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- Issue #8230: Fix Lib/test/sortperf.py.

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- Issue #8620: when a Cmd is fed input that reaches EOF without a final newline,
  it no longer truncates the last character of the last command line.
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- Issue #5146: Handle UID THREAD command correctly in imaplib.

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- Issue #5147: Fix the header generated for cookie files written by
  http.cookiejar.MozillaCookieJar.

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- Issue #8198: In pydoc, output all help text to the correct stream when
  sys.stdout is reassigned.
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- Issue #7909: Do not touch paths with the special prefixes ``\\.\`` or ``\\?\``
  in ntpath.normpath().
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- Issue #1286: Allow using fileinput.FileInput as a context manager.

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- Add lru_cache() decorator to the functools module.
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Tools/Demos
-----------

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- Fix ``Tools/scripts/checkpyc.py`` after PEP 3147.

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- Issue #8867: Fix ``Tools/scripts/serve.py`` to work with files containing
  non-ASCII content.

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Tests
-----

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- Issue #9601: Provide a test case for ftplib.parse257.

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- Issue #8857: Provide a test case for socket.getaddrinfo.

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- Issue #7564: Skip test_ioctl if another process is attached to /dev/tty.

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- Issue #8433: Fix test_curses failure with newer versions of ncurses.

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- Issue #9496: Provide a test suite for the rlcompleter module.  Patch by
  Michele Orrù.

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- Issue #8687: provide a test suite for sched.py module.

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Build
-----

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- Issue #1303434: Generate ZIP file containing all PDBs.

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- Issue #9193: PEP 3149 is accepted.

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- Issue #3101: Helper functions _add_one_to_index_C() and _add_one_to_index_F()
  become _Py_add_one_to_index_C() and _Py_add_one_to_index_F(), respectively.
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- Issue #9700: define HAVE_BROKEN_POSIX_SEMAPHORES under AIX 6.x.  Patch by
  Sébastien Sablé.

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- Don't run pgen twice when using make -j.

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What's New in Python 3.2 Alpha 1?
=================================

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*Release date: 01-Aug-2010*
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Core and Builtins
-----------------

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- Issue #8991: convertbuffer() rejects discontigious buffers.

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- Issue #7616: Fix copying of overlapping memoryview slices with the Intel
  compiler.

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- Issue #8413: structsequence now subclasses tuple.

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- Issue #8271: during the decoding of an invalid UTF-8 byte sequence, only the
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  start byte and the continuation byte(s) are now considered invalid, instead of
  the number of bytes specified by the start byte.  E.g.:
  '\xf1\x80AB'.decode('utf-8', 'replace') now returns u'\ufffdAB' and replaces
  with U+FFFD only the start byte ('\xf1') and the continuation byte ('\x80')
  even if '\xf1' is the start byte of a 4-bytes sequence.  Previous versions
  returned a single u'\ufffd'.
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- Issue #9011: A negated imaginary literal (e.g., "-7j") now has real part -0.0
  rather than 0.0.  So "-7j" is now exactly equivalent to "-(7j)".
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- Be more specific in error messages about positional arguments.

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- Issue #8949: "z" format of PyArg_Parse*() functions doesn't accept bytes
  objects, as described in the documentation.

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- Issue #6543: Write the traceback in the terminal encoding instead of utf-8.
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  Fix the encoding of the modules filename.  Patch written by Amaury Forgeot
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  d'Arc.
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- Issue #9011: Remove buggy and unnecessary (in 3.x) ST->AST compilation code
  dealing with unary minus applied to a constant.  The removed code was mutating
  the ST, causing a second compilation to fail.
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- Issue #850997: mbcs encoding (Windows only) handles errors argument: strict
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  mode raises unicode errors.  The encoder only supports "strict" and "replace"
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  error handlers, the decoder only supports "strict" and "ignore" error
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  handlers.  Patch written by Mark Hammond.
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- Issue #8850: Remove "w" and "w#" formats from PyArg_Parse*() functions, use
  "w*" format instead. Add tests for "w*" format.

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- Issue #8592: PyArg_Parse*() functions raise a TypeError for "y", "u" and "Z"
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  formats if the string contains a null byte/character.  Write unit tests for
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  string formats.

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- Issue #7490: To facilitate sharing of doctests between 2.x and 3.x test
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  suites, the IGNORE_EXCEPTION_DETAIL directive now also ignores the module
  location of the raised exception.

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- Issue #8969: On Windows, use mbcs codec in strict mode to encode and decode
  filenames and enable os.fsencode().

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- Issue #9058: Remove assertions about INT_MAX in UnicodeDecodeError.

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- Issue #8941: Decoding big endian UTF-32 data in UCS-2 builds could crash the
  interpreter with characters outside the Basic Multilingual Plane (higher than
  0x10000).
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- Issue #8950: (See also issue #5080).  Py_ArgParse*() functions now raise
  TypeError instead of giving a DeprecationWarning when a float is parsed using
  the 'L' code (for long long).  (All other integer codes already raise
  TypeError in this case.)
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- Issue #8922: Normalize the encoding name in PyUnicode_AsEncodedString() to
  enable shortcuts for upper case encoding name. Add also a shortcut for
  "iso-8859-1" in PyUnicode_AsEncodedString() and PyUnicode_Decode().

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- Issue #8838: Remove codecs.charbuffer_encode() function.  The buffer protocol
  doesn't support "char buffer" anymore in Python 3.
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- Issue #8339: Remove "t#" format of PyArg_Parse*() functions, use "s#" or "s*"
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  instead.  codecs.charbuffer_encode() now accepts modifiable buffer objects
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  like bytearray.

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- Issue #8837: Remove "O?" format of PyArg_Parse*() functions.  The format is no
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  used anymore and it was never documented.

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- In str.format(), raise a ValueError when indexes to arguments are too large.
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- Issue #2844: Make int('42', n) consistently raise ValueError for invalid
  integers n (including n = -909).
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- Issue #8188: Introduce a new scheme for computing hashes of numbers (instances
  of int, float, complex, decimal.Decimal and fractions.Fraction) that makes it
  easy to maintain the invariant that hash(x) == hash(y) whenever x and y have
  equal value.
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- Issue #8748: Fix two issues with comparisons between complex and integer
  objects.  (1) The comparison could incorrectly return True in some cases
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  (2**53+1 == complex(2**53) == 2**53), breaking transitivity of equality.
  (2) The comparison raised an OverflowError for large integers, leading to
  unpredictable exceptions when combining integers and complex objects in sets
  or dicts.
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- Issue #8766: Initialize _warnings module before importing the first module.
  Fix a crash if an empty directory called "encodings" exists in sys.path.

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- Issue #8589: Decode PYTHONWARNINGS environment variable with the file system
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  encoding and surrogateescape error handler instead of the locale encoding to
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  be consistent with os.environ.  Add PySys_AddWarnOptionUnicode() function.
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- PyObject_Dump() encodes unicode objects to utf8 with backslashreplace (instead
  of strict) error handler to escape surrogates.
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- Issue #8715: Create PyUnicode_EncodeFSDefault() function: Encode a Unicode
  object to Py_FileSystemDefaultEncoding with the "surrogateescape" error
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  handler, and return bytes.  If Py_FileSystemDefaultEncoding is not set, fall
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  back to UTF-8.
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- Enable shortcuts for common encodings in PyUnicode_AsEncodedString() for any
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  error handler, not only the default error handler (strict).
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- Issue #8610: Load file system codec at startup, and display a fatal error on
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  failure.  Set the file system encoding to utf-8 (instead of None) if getting
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  the locale encoding failed, or if nl_langinfo(CODESET) function is missing.

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- PyFile_FromFd() uses PyUnicode_DecodeFSDefault() instead of
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  PyUnicode_FromString() to support surrogates in the filename and use the right
  encoding.
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- Issue #7507: Quote "!" in pipes.quote(); it is special to some shells.

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- PyUnicode_DecodeFSDefaultAndSize() uses surrogateescape error handler.
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- Issue #8419: Prevent the dict constructor from accepting non-string keyword
  arguments.

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- Issue #8124: PySys_WriteStdout() and PySys_WriteStderr() don't execute
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  indirectly Python signal handlers anymore because mywrite() ignores exceptions
  (KeyboardInterrupt).
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- Issue #8092: Fix PyUnicode_EncodeUTF8() to support error handler producing
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  unicode string (eg. backslashreplace).
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- Issue #8485: PyUnicode_FSConverter() doesn't accept byteearray objects
  anymore, you have to convert your bytearray filenames to bytes.
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- Issue #7332: Remove the 16KB stack-based buffer in
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  PyMarshal_ReadLastObjectFromFile, which doesn't bring any noticeable benefit
  compared to the dynamic memory allocation fallback.  Patch by Charles-François
  Natali.
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- Issue #8417: Raise an OverflowError when an integer larger than sys.maxsize is
  passed to bytes or bytearray.

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- Issue #7301: Add environment variable $PYTHONWARNINGS.

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- Issue #8329: Don't return the same lists from select.select when no fds are
  changed.

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- Issue #8259: 1L << (2**31) no longer produces an 'outrageous shift error' on
  64-bit machines.  The shift count for either left or right shift is permitted
  to be up to sys.maxsize.
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- Ensure that tokenization of identifiers is not affected by locale.

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- Issue #1222585: Added LDCXXSHARED for C++ support. Patch by Arfrever.

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- Raise a TypeError when trying to delete a T_STRING_INPLACE struct member.

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- Issue #8211: Save/restore CFLAGS around AC_PROG_CC in configure.in, in case it
  is set.
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- Issue #8226: sys.setfilesystemencoding() raises a LookupError if the encoding
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  is unknown.
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- Issue #1583863: A str subclass can now override the __str__ method.
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- Issue #8014: Setting a T_UINT or T_PYSSIZET attribute of an object with
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  PyMemberDefs could produce an internal error; raise TypeError instead.
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- Issue #7845: Rich comparison methods on the complex type now return
  NotImplemented rather than raising a TypeError when comparing with an
  incompatible type; this allows user-defined classes to implement their own
  comparisons with complex.

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- Issue #3137: Don't ignore errors at startup, especially a keyboard interrupt
  (SIGINT). If an error occurs while importing the site module, the error is
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  printed and Python exits. Initialize the GIL before importing the site module.
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- Issue #7173: Generator finalization could invalidate sys.exc_info().

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- Issue #7544: Preallocate thread memory before creating the thread to avoid a
  fatal error in low memory condition.
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- Issue #7820: The parser tokenizer restores all bytes in the right if the BOM
  check fails.
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- Handle errors from looking up __prepare__ correctly.

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- Issue #5939: Add additional runtime checking to ensure a valid capsule in
  Modules/_ctypes/callproc.c.
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- Issue #7309: Fix unchecked attribute access when converting
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  UnicodeEncodeError, UnicodeDecodeError, and UnicodeTranslateError to strings.
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- Issue #6902: Fix problem with built-in types format incorrectly with 0
  padding.
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- Issue #7988: Fix default alignment to be right aligned for complex.__format__.
  Now it matches other numeric types.
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- Issue #5988: Remove deprecated functions PyOS_ascii_formatd,
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  PyOS_ascii_strtod, and PyOS_ascii_atof.  Use PyOS_double_to_string and
  PyOS_string_to_double instead.  See issue #5835 for the original deprecations.
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- Issue #7385: Fix a crash in `MemoryView_FromObject` when `PyObject_GetBuffer`
  fails.  Patch by Florent Xicluna.
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- Issue #7788: Fix an interpreter crash produced by deleting a list slice with
  very large step value.
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- Issue #7766: Change sys.getwindowsversion() return value to a named tuple and
  add the additional members returned in an OSVERSIONINFOEX structure.  The new
  members are service_pack_major, service_pack_minor, suite_mask, and
  product_type.
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- Issue #7561: Operations on empty bytearrays (such as `int(bytearray())`) could
  crash in many places because of the PyByteArray_AS_STRING() macro returning
  NULL.  The macro now returns a statically allocated empty string instead.
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- Issue #6690: Optimize the bytecode for expressions such as `x in {1, 2, 3}`,
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  where the right hand operand is a set of constants, by turning the set into a
  frozenset and pre-building it as a constant.  The comparison operation is made
  against the constant instead of building a new set each time it is executed (a
  similar optimization already existed which turned a list of constants into a
  pre-built tuple).  Patch and additional tests by Dave Malcolm.

- Issue #7622: Improve the split(), rsplit(), splitlines() and replace() methods
  of bytes, bytearray and unicode objects by using a common implementation based
  on stringlib's fast search.  Patch by Florent Xicluna.

- Issue #7632: Fix various str -> float conversion bugs present in 2.7 alpha 2,
  including: (1) a serious 'wrong output' bug that could occur for long (> 40
  digit) input strings, (2) a crash in dtoa.c that occurred in debug builds when
  parsing certain long numeric strings corresponding to subnormal values, (3) a
  memory leak for some values large enough to cause overflow, and (4) a number
  of flaws that could lead to incorrectly rounded results.
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- The __complex__ method is now looked up on the class of instances to make it
  consistent with other special methods.

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- Issue #7462: Implement the stringlib fast search algorithm for the `rfind`,
  `rindex`, `rsplit` and `rpartition` methods.  Patch by Florent Xicluna.

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- Issue #7604: Deleting an unset slotted attribute did not raise an
  AttributeError.

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- Issue #7534: Fix handling of IEEE specials (infinities, nans, negative zero)
  in ** operator.  The behaviour now conforms to that described in C99 Annex F.
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- Issue #1811: improve accuracy and cross-platform consistency for true division
  of integers: the result of a/b is now correctly rounded for ints a and b (at
  least on IEEE 754 platforms), and in particular does not depend on the
  internal representation of an int.
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- Issue #6834: replace the implementation for the 'python' and 'pythonw'
  executables on OSX.

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  These executables now work properly with the arch(1) command: ``arch -ppc
  python`` will start a universal binary version of python in PPC mode (unlike
  previous releases).
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- Issue #7466: Segmentation fault when the garbage collector is called in the
  middle of populating a tuple.  Patch by Florent Xicluna.
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- Issue #7419: setlocale() could crash the interpreter on Windows when called
  with invalid values.

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- Issue #6077: On Windows, files opened with tempfile.TemporaryFile in "wt+"
  mode would appear truncated on the first '0x1a' byte (aka. Ctrl+Z).

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- Issue #7085: Fix crash when importing some extensions in a thread on MacOSX
  10.6.
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- Issue #1757126: Fix the cyrillic-asian alias for the ptcp154 encoding.

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- Issue #6970: Remove redundant calls when comparing objects that don't
  implement the relevant rich comparison methods.

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- Issue #7298: Fixes for range and reversed(range(...)).  Iteration over
  range(a, b, c) incorrectly gave an empty iterator when a, b and c fit in C
  long but the length of the range did not.  Also fix several cases where
  reversed(range(a, b, c)) gave wrong results, and fix a refleak for
  reversed(range(a, b, c)) with large arguments.
1074

1075 1076
- Issue #7244: itertools.izip_longest() no longer ignores exceptions raised
  during the formation of an output tuple.
1077

1078 1079 1080
- Issue #3297: On wide unicode builds, do not split unicode characters into
  surrogates.

1081 1082
- Remove length limitation when constructing a complex number from a string.

1083 1084
- Issue #1087418: Boost performance of bitwise operations for longs.

1085 1086 1087 1088 1089 1090 1091
- Support for AtheOS has been completely removed from the code base. It was
  disabled since Python 3.0.

- Support for several legacy threading libraries has been disabled. These
  libraries are: Mach C threads, SunOS LWP, GNU pth, Irix threads. Support code
  will be entirely removed in 3.3.

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- Support for OSF* has been disabled. If nobody stands up, support will be
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  removed in 3.3. See <http://bugs.python.org/issue8606>.
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- Peephole constant folding had missed UNARY_POSITIVE.

1097 1098 1099 1100
- Issue #1722344: threading._shutdown() is now called in Py_Finalize(), which
  fixes the problem of some exceptions being thrown at shutdown when the
  interpreter is killed. Patch by Adam Olsen.

1101
- Issue #7147: Remove support for compiling Python without complex number
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  support.

1104 1105
- Issue #7120: logging: Removed import of multiprocessing which is causing crash
  in GAE.
1106

1107 1108 1109
- Issue #1754094: Improve the stack depth calculation in the compiler.  There
  should be no other effect than a small decrease in memory use.  Patch by
  Christopher Tur Lesniewski-Laas.
1110

1111 1112
- Issue #7065: Fix a crash in bytes.maketrans and bytearray.maketrans when using
  byte values greater than 127.  Patch by Derk Drukker.
1113

1114 1115 1116 1117 1118
- Issue #1571184: The Unicode database contains properties for more characters.
  The tables for code points representing numeric values, white spaces or line
  breaks are now generated from the official Unicode Character Database files,
  and include information from the Unihan.txt file.

1119 1120
- Issue #7019: Raise ValueError when unmarshalling bad long data, instead of
  producing internally inconsistent Python longs.
1121

1122 1123
- Issue #6990: Fix threading.local subclasses leaving old state around after a
  reference cycle GC which could be recycled by new locals.
1124

1125 1126
- Issue #5460: Fix an ambiguity in the grammar.

1127 1128
- Issue #1766304: Improve performance of membership tests on range objects.

1129 1130
- Issue #6713: Improve performance of integer -> string conversions.

1131 1132
- Issue #6846: Fix bug where bytearray.pop() returns negative integers.

1133 1134
- Issue #6750: A text file opened with io.open() could duplicate its output when
  writing from multiple threads at the same time.
1135

1136 1137
- Issue #6707: dir() on an uninitialized module caused a crash.

1138 1139
- Issue #6540: Fixed crash for bytearray.translate() with invalid parameters.

1140 1141 1142
- Issue #6573: set.union() stopped processing inputs if an instance of self
  occurred in the argument chain.

1143 1144
- Issue #6070: On posix platforms import no longer copies the execute bit from
  the .py file to the .pyc file if it is set.
1145

1146 1147
- Issue #1616979: Added the cp720 (Arabic DOS) encoding.

1148 1149
- Issue #6428: Since Python 3.0, the __bool__ method must return a bool object,
  and not an int.  Fix the corresponding error message, and the documentation.
1150

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1151 1152
- The deprecated PyCObject has been removed.

1153 1154 1155
- Issue #6347: Include inttypes.h as well as stdint.h in pyport.h.  This fixes a
  build failure on HP-UX: int32_t and uint32_t are defined in inttypes.h instead
  of stdint.h on that platform.
1156

1157 1158
- Issue #6373: Fixed a SystemError when encoding with the latin-1 codec and the
  'surrogateescape' error handler, a string which contains unpaired surrogates.
1159

1160 1161
- Issue #4856: Remove checks for win NT.

1162 1163
- Issue #6687: PyBytes_FromObject() no longer accepts an integer as its argument
  to construct a null-initialized bytes object.
1164

1165 1166
- Issue #1023290: Add from_bytes() and to_bytes() methods to integers.  These
  methods allow the conversion of integers to bytes, and vice-versa.
1167

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- Issue #7382: Fix bug in bytes.__getnewargs__ that prevented bytes instances
  from being copied with copy.copy(), and bytes subclasses from being pickled
  properly.
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- Code objects now support weak references.

1174
- Issue #7072: isspace(0xa0) is true on Mac OS X.
1175

1176
- Issue #8084: PEP 370 now conforms to system conventions for framework builds
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  on MacOS X. That is, "python setup.py install --user" will install into
  "~/Library/Python/2.7" instead of "~/.local".
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C-API
-----

1183 1184 1185 1186
- Issue #2443: A new macro, `Py_VA_COPY`, copies the state of the
  variable argument list.  `Py_VA_COPY` is equivalent to C99
  `va_copy`, but available on all python platforms.

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- PySlice_GetIndicesEx now clips the step to [-PY_SSIZE_T_MAX, PY_SSIZE_T_MAX]
  instead of [-PY_SSIZE_T_MAX-1, PY_SSIZE_T_MAX].  This makes it safe to do
  "step = -step" when reversing a slice.

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- Issue #5753: A new C API function, `PySys_SetArgvEx`, allows embedders of the
  interpreter to set sys.argv without also modifying sys.path.  This helps fix
  `CVE-2008-5983
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  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5983>`_.

1196 1197 1198
- Add PyArg_ValidateKeywordArguments, which checks if all keyword arguments are
  strings in an efficient manner.

1199
- Issue #8276: PyEval_CallObject() is now only available in macro form.  The
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  function declaration, which was kept for backwards compatibility reasons, is
  now removed (the macro was introduced in 1997!).
1202

1203 1204
- Issue #7767: New function PyLong_AsLongLongAndOverflow added, analogous to
  PyLong_AsLongAndOverflow.
1205

1206 1207 1208
- Make PyUnicode_CompareWithASCIIString return not equal if the Python string
  has '\0' at the end.

1209
- Issue #5080: The argument parsing functions PyArg_ParseTuple,
1210 1211 1212
  PyArg_ParseTupleAndKeywords, PyArg_VaParse, PyArg_VaParseTupleAndKeywords and
  PyArg_Parse now raise a DeprecationWarning for float arguments passed with the
  'L' format code.  This will become a TypeError in a future version of Python,
1213 1214
  to match the behaviour of the other integer format codes.

1215
- Issue #7033: Function ``PyErr_NewExceptionWithDoc()`` added.
1216

1217 1218
- Issue #7414: 'C' code wasn't being skipped properly (for keyword arguments) in
  PyArg_ParseTupleAndKeywords.
1219

1220 1221
- Issue #7228: Add '%lld' and '%llu' support to PyString_FromFormat(V) and
  PyErr_Format, on machines with HAVE_LONG_LONG defined.
1222

1223 1224 1225
- Issue #6151: Made PyDescr_COMMON conform to standard C (like PyObject_HEAD in
  PEP 3123).  The PyDescr_TYPE and PyDescr_NAME macros should be should used for
  accessing the d_type and d_name members of structures using PyDescr_COMMON.
1226 1227

- Issue #6405: Remove duplicate type declarations in descrobject.h.
1228

1229 1230
- The code flags for old __future__ features are now available again.

1231 1232 1233 1234 1235 1236 1237 1238 1239
- Issue #5954: Add a PyFrame_GetLineNumber() function to replace most uses of
  PyCode_Addr2Line().

- Issue #5959: Add a PyCode_NewEmpty() function to create a new empty code
  object at a specified file, function, and line number.

- Issue #1419652: Change the first argument to PyImport_AppendInittab() to
  ``const char *`` as the string is stored beyond the call.

1240 1241 1242 1243
- Issue #2422: When compiled with the ``--with-valgrind`` option, the pymalloc
  allocator will be automatically disabled when running under Valgrind.  This
  gives improved memory leak detection when running under Valgrind, while taking
  advantage of pymalloc at other times.
1244

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Library
-------
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1248 1249
- In pdb, when Ctrl-C is entered while defining commands for a breakpoint, the
  old commands are restored.
1250

1251 1252 1253
- For traceback debugging, the pdb listing now also shows the locations where
  the exception was originally (re)raised, if it differs from the last line
  executed (e.g. in case of finally clauses).
1254

1255 1256
- The pdb command "source" has been added.  It displays the source code for a
  given object, if possible.
1257

1258 1259
- The pdb command "longlist" has been added.  It displays the whole source code
  for the current function.
1260

1261 1262
- Issue #1503502: Make pdb.Pdb easier to subclass by putting message and error
  output into methods.
1263

1264 1265
- Issue #809887: Make the output of pdb's breakpoint deletions more consistent;
  emit a message when a breakpoint is enabled or disabled.
1266

1267 1268
- Issue #5294: Fix the behavior of pdb's "continue" command when called in the
  top-level debugged frame.
1269

1270 1271
- Issue #5727: Restore the ability to use readline when calling into pdb in
  doctests.
1272

1273 1274
- Issue #6719: In pdb, do not stop somewhere in the encodings machinery if the
  source file to be debugged is in a non-builtin encoding.
1275

1276 1277
- Issue #8048: Prevent doctests from failing when sys.displayhook has been
  reassigned.
1278

1279 1280
- Issue #8015: In pdb, do not crash when an empty line is entered as a
  breakpoint command.
1281

1282 1283
- In pdb, allow giving a line number to the "until" command.

1284 1285 1286
- Issue #1437051: For pdb, allow "continue" and related commands in .pdbrc
  files.  Also, add a command-line option "-c" that runs a command as if given
  in .pdbrc.
1287

1288 1289
- Issue #4179: In pdb, allow "list ." as a command to return to the currently
  debugged line.
1290

1291
- Issue #4108: In urllib.robotparser, if there are multiple ``User-agent: *``
1292 1293
  entries, consider the first one.

1294 1295 1296
- Issue #6630: Allow customizing regex flags when subclassing the
  string.Template class.

1297 1298
- Issue #9411: Allow specifying an encoding for config files in the configparser
  module.
1299

1300 1301
- Issue #1682942: Improvements to configparser: support alternate delimiters,
  alternate comment prefixes and empty lines in values.
1302

1303 1304
- Issue #9354: Provide getsockopt() in asyncore's file_wrapper.

1305 1306
- Issue #8966: ctypes: Remove implicit bytes-unicode conversion.

1307 1308
- Issue #9378: python -m pickle <pickle file> will now load and display the
  first object in the pickle file.
1309

1310
- Issue #4770: Restrict binascii module to accept only bytes (as specified).
1311 1312
  And fix the email package to encode to ASCII instead of ``raw-unicode-escape``
  before ASCII-to-binary decoding.
1313

1314
- Issue #9384: ``python -m tkinter`` will now display a simple demo applet.
1315

1316 1317
- The default size of the re module's compiled regular expression cache has been
  increased from 100 to 500 and the cache replacement policy has changed from
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1318 1319
  simply clearing the entire cache on overflow to forgetting the least recently
  used cached compiled regular expressions.  This is a performance win for
1320 1321
  applications that use a lot of regular expressions and limits the impact of
  the performance hit anytime the cache is exceeded.
1322

1323 1324
- Issue #7113: Speed up loading in configparser. Patch by Łukasz Langa.

1325
- Issue #9032: XML-RPC client retries the request on EPIPE error.  The EPIPE
1326 1327 1328
  error occurs when the server closes the socket and the client sends a big
  XML-RPC request.

1329 1330 1331
- Issue #4629: getopt raises an error if an argument ends with "=", whereas
  getopt doesn't accept a value (eg. --help= is rejected if getopt uses
  ['help='] long options).
1332

1333 1334 1335 1336 1337 1338
- Issue #7989: Added pure python implementation of the `datetime` module.  The C
  module is renamed to `_datetime` and if available, overrides all classes
  defined in datetime with fast C impementation.  Python implementation is based
  on the original python prototype for the datetime module by Tim Peters with
  minor modifications by the PyPy project.  The test suite now tests `datetime`
  module with and without `_datetime` acceleration using the same test cases.
1339

1340
- Issue #7895: platform.mac_ver() no longer crashes after calling os.fork().
1341

1342 1343
- Issue #9323: Fixed a bug in trace.py that resulted in loosing the name of the
  script being traced.  Patch by Eli Bendersky.
1344

1345 1346
- Issue #9282: Fixed --listfuncs option of trace.py.  Thanks Eli Bendersky for
  the patch.
1347

1348 1349 1350
- Issue #3704: http.cookiejar was not properly handling URLs with a / in the
  parameters.

1351 1352
- Issue #9268: ``pickletools.dis()`` now has an optional *annotate* argument
  which controls printing of opcode descriptions in ``dis()`` output.
1353

1354 1355
- Issue #1555570: email no longer inserts extra blank lines when a \r\n combo
  crosses an 8192 byte boundary.
1356

1357 1358
- Issue #9243: Fix sndhdr module and add unit tests, contributed by James Lee.

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1359 1360
- ``ast.literal_eval()`` now allows byte literals.

1361 1362
- Issue #9137: Fix issue in MutableMapping.update, which incorrectly treated
  keyword arguments called 'self' or 'other' specially.
1363

1364 1365 1366
- ``ast.literal_eval()`` now allows set literals.

- Issue #9164: Ensure that sysconfig handles duplicate -arch flags in CFLAGS.
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1368 1369
- Issue #7646: The fnmatch pattern cache no longer grows without bound.

1370 1371 1372
- Issue #9136: Fix 'dictionary changed size during iteration' RuntimeError
  produced when profiling the decimal module.  This was due to a dangerous
  iteration over 'locals()' in Context.__init__.
1373

1374 1375 1376
- Fix extreme speed issue in Decimal.pow when the base is an exact power of 10
  and the exponent is tiny (for example, ``Decimal(10) **
  Decimal('1e-999999999')``).
1377

1378 1379
- Issue #9186: Fix math.log1p(-1.0) to raise ValueError, not OverflowError.

1380 1381
- Issue #9130: Fix validation of relative imports in parser module.

1382 1383
- Issue #9128: Fix validation of class decorators in parser module.

1384 1385 1386
- Issue #9094: python -m pickletools will now disassemble pickle files listed in
  the command line arguments.  See output of python -m pickletools -h for more
  details.
1387

1388 1389 1390
- Issue #5468: urlencode to handle bytes type and other encodings in its query
  parameter. Patch by Dan Mahn.

1391 1392
- Issue #7673: Fix security vulnerability (CVE-2010-2089) in the audioop module,
  ensure that the input string length is a multiple of the frame size.
1393

1394 1395
- Issue #6507: Accept source strings in dis.dis().  Original patch by Daniel
  Urban.
1396

1397 1398 1399
- Issue #7829: Clearly document that the dis module is exposing an
  implementation detail that is not stable between Python VMs or releases.

1400
- Issue #6589: cleanup asyncore.socket_map in case smtpd.SMTPServer constructor
1401 1402
  raises an exception.

1403
- Issue #9110: Addition of ContextDecorator to contextlib, for creating APIs
1404 1405
  that act as both context managers and decorators. contextmanager changes to
  use ContextDecorator.
1406

1407 1408 1409
- Implement importlib.abc.SourceLoader and deprecate PyLoader and PyPycLoader
  for removal in Python 3.4.

1410 1411
- Issue #9064: pdb's "up" and "down" commands now accept an optional argument
  giving the number of frames to go.
1412

1413 1414
- Issue #9018: os.path.normcase() now raises a TypeError if the argument is not
  ``str`` or ``bytes``.
1415

1416 1417
- Issue #9075: In the ssl module, remove the setting of a ``debug`` flag on an
  OpenSSL structure.
1418

1419 1420
- Issue #8682: The ssl module now temporary increments the reference count of a
  socket object got through ``PyWeakref_GetObject``, so as to avoid possible
1421 1422
  deallocation while the object is still being used.

1423
- Issue #1368368: FancyURLOpener class changed to throw an Exception on wrong
1424
  password instead of presenting an interactive prompt.  Older behavior can be
1425 1426
  obtained by passing retry=True to http_error_xxx methods of FancyURLOpener.

1427
- Issue #8720: Fix regression caused by fix for #4050 by making getsourcefile
1428 1429
  smart enough to find source files in the linecache.

1430 1431
- Issue #5610: feedparser no longer eats extra characters at the end of a body
  part if the body part ends with a ``\r\n``.
1432

1433 1434
- Issue #8986: math.erfc was incorrectly raising OverflowError for values
  between -27.3 and -30.0 on some platforms.
1435

1436 1437
- Issue #8784: Set tarfile default encoding to 'utf-8' on Windows.

1438 1439 1440
- Issue #8966: If a ctypes structure field is an array of c_char, convert its
  value to bytes instead of str (as done for c_char and c_char_p).

1441 1442 1443 1444 1445
- Issue #8188: Comparisons between Decimal and Fraction objects are now
  permitted, returning a result based on the exact numerical values of the
  operands.  This builds on issue #2531, which allowed Decimal-to-float
  comparisons; all comparisons involving numeric types (bool, int, float,
  complex, Decimal, Fraction) should now act as expected.
1446

1447 1448
- Issue #8897: Fix sunau module, use bytes to write the header. Patch written by
  Thomas Jollans.
1449

1450 1451
- Issue #8899: time.struct_time now has class and atribute docstrings.

1452 1453
- Issue #6470: Drop UNC prefix in FixTk.

1454 1455
- Issue #4768: base64 encoded email body parts were incorrectly stored as binary
  strings.  They are now correctly converted to strings.
1456

1457 1458 1459
- Issue #8833: tarfile created hard link entries with a size field != 0 by
  mistake.

1460 1461
- Charset.body_encode now correctly handles base64 encoding by encoding with the
  output_charset before calling base64mime.encode.  Passes the tests from 2.x
1462
  issue #1368247.
1463

1464 1465 1466
- Issue #8845: sqlite3 Connection objects now have a read-only in_transaction
  attribute that is True iff there are uncommitted changes.

1467 1468 1469
- Issue #1289118: datetime.timedelta objects can now be multiplied by float and
  divided by float and int objects.  Results are rounded to the nearest multiple
  of timedelta.resolution with ties resolved using round-half-to-even method.
1470

1471 1472 1473
- Issue #7150: Raise OverflowError if the result of adding or subtracting
  timedelta from date or datetime falls outside of the MINYEAR:MAXYEAR range.

1474 1475
- Issue #8806: add SSL contexts support to ftplib.

1476 1477
- Issue #4769: Fix main() function of the base64 module, use sys.stdin.buffer
  and sys.stdout.buffer (instead of sys.stdin and sys.stdout) to use the bytes
1478
  API.
1479

1480 1481
- Issue #8770: Now sysconfig displays information when it's called as a script.
  Initial idea by Sridhar Ratnakumar.
1482

1483
- Issue #6662: Fix parsing of malformatted charref (&#bad;), patch written by
1484
  Fredrik Håård.
1485

1486
- Issue #8540: Decimal module: rename the Context._clamp attribute to
1487 1488
  Context.clamp and make it public.  This is useful in creating contexts that
  correspond to the decimal interchange formats specified in IEEE 754.
1489

1490 1491 1492
- Issue #6268: Fix seek() method of codecs.open(), don't read or write the BOM
  twice after seek(0). Fix also reset() method of codecs, UTF-16, UTF-32 and
  StreamWriter classes.
1493

1494
- Issue #3798: sys.exit(message) writes the message to sys.stderr file, instead
1495
  of the C file stderr, to use stderr encoding and error handler.
1496

1497 1498 1499
- Issue #8782: Add a trailing newline in linecache.updatecache to the last line
  of files without one.

1500 1501 1502
- Issue #8729: Return NotImplemented from collections.Mapping.__eq__ when
  comparing to a non-mapping.

1503
- Issue #8774: tabnanny uses the encoding cookie (#coding:...) to use the
1504
  correct encoding.
1505

1506 1507 1508
- Issue #4870: Add an `options` attribute to SSL contexts, as well as several
  ``OP_*`` constants to the `ssl` module.  This allows to selectively disable
  protocol versions, when used in combination with `PROTOCOL_SSLv23`.
1509

1510 1511
- Issue #8759: Fixed user paths in sysconfig for posix and os2 schemes.

1512 1513 1514 1515
- Issue #8663: distutils.log emulates backslashreplace error handler. Fix
  compilation in a non-ASCII directory if stdout encoding is ASCII (eg. if
  stdout is not a TTY).

1516 1517 1518 1519 1520
- Issue #8513: os.get_exec_path() supports b'PATH' key and bytes value.
  subprocess.Popen() and os._execvpe() support bytes program name. Add
  os.supports_bytes_environ flag: True if the native OS type of the environment
  is bytes (eg. False on Windows).

1521 1522 1523
- Issue #8633: tarfile is now able to read and write archives with "raw" binary
  pax headers as described in POSIX.1-2008.

1524 1525 1526
- Issue #1285086: Speed up urllib.parse functions: quote, quote_from_bytes,
  unquote, unquote_to_bytes.

1527 1528
- Issue #8688: Distutils now recalculates MANIFEST everytime.

1529
- Issue #8477: ssl.RAND_egd() and ssl._test_decode_cert() support str with
1530
  surrogates and bytes for the filename.
1531

1532 1533
- Issue #8550: Add first class ``SSLContext`` objects to the ssl module.

1534 1535
- Issue #8681: Make the zlib module's error messages more informative when the
  zlib itself doesn't give any detailed explanation.
1536

1537 1538
- The audioop module now supports sound fragments of length greater than 2**31
  bytes on 64-bit machines, and is PY_SSIZE_T_CLEAN.
1539

1540 1541 1542
- Issue #4972: Add support for the context manager protocol to the ftplib.FTP
  class.

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1543 1544 1545
- Issue #8664: In py_compile, create __pycache__ when the compiled path is
  given.

1546 1547 1548
- Issue #8514: Add os.fsencode() function (Unix only): encode a string to bytes
  for use in the file system, environment variables or the command line.

1549 1550
- Issue #8571: Fix an internal error when compressing or decompressing a chunk
  larger than 1GB with the zlib module's compressor and decompressor objects.
1551

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- Issue #8603: Support bytes environmental variables on Unix: Add os.environb
  mapping and os.getenvb() function. os.unsetenv() encodes str argument to the
  file system encoding with the surrogateescape error handler (instead of
  utf8/strict) and accepts bytes. posix.environ keys and values are now bytes.
1556

1557 1558
- Issue #8573: asyncore _strerror() function might throw ValueError.

1559 1560 1561 1562
- Issue #8483: asyncore.dispatcher's __getattr__ method produced confusing error
  messages when accessing undefined class attributes because of the cheap
  inheritance with the underlying socket object.  The cheap inheritance has been
  deprecated.
1563

1564 1565 1566
- Issue #4265: shutil.copyfile() was leaking file descriptors when disk fills.
  Patch by Tres Seaver.

1567
- Issue #8390: tarfile uses surrogateescape as the default error handler
1568
  (instead of replace in read mode or strict in write mode).
1569

1570 1571
- Issue #7755: Use an unencumbered audio file for tests.

1572 1573
- Issue #8621: uuid.uuid4() returned the same sequence of values in the parent
  and any children created using ``os.fork`` on MacOS X 10.6.
1574

1575 1576 1577 1578 1579
- Issue #8567: Fix precedence of signals in Decimal module: when a Decimal
  operation raises multiple signals and more than one of those signals is
  trapped, the specification determines the order in which the signals should be
  handled.  In many cases this order wasn't being followed, leading to the wrong
  Python exception being raised.
1580

1581
- Issue #7865: The close() method of :mod:`io` objects should not swallow
1582 1583
  exceptions raised by the implicit flush().  Also qensure that calling close()
  several times is supported.  Patch by Pascal Chambon.
1584

1585 1586 1587
- Issue #4687: Fix accuracy of garbage collection runtimes displayed with
  gc.DEBUG_STATS.

1588 1589
- Issue #8354: The siginterrupt setting is now preserved for all signals, not
  just SIGCHLD.
1590

1591
- Issue #7192: webbrowser.get("firefox") now works on Mac OS X, as does
1592 1593
  webbrowser.get("safari").

1594 1595
- Issue #8464: tarfile no longer creates files with execute permissions set when
  mode="w|" is used.
1596

1597 1598
- Issue #7834: Fix connect() of Bluetooth L2CAP sockets with recent versions of
  the Linux kernel.  Patch by Yaniv Aknin.
1599

1600 1601
- Issue #8295: Added shutil.unpack_archive.

1602 1603 1604
- Issue #6312: Fixed http HEAD request when the transfer encoding is chunked.
  It should correctly return an empty response now.

1605 1606
- Issue #8546: Reject None given as the buffering argument to _pyio.open.

1607 1608 1609
- Issue #8549: Fix compiling the _ssl extension under AIX.  Patch by
  Sridhar Ratnakumar.

1610 1611 1612
- Issue #6656: fix locale.format_string to handle escaped percents
  and mappings.

1613 1614 1615 1616
- Issue #2302: Fix a race condition in SocketServer.BaseServer.shutdown, where
  the method could block indefinitely if called just before the event loop
  started running.  This also fixes the occasional freezes witnessed in
  test_httpservers.
1617

1618 1619 1620
- Issue #8524: When creating an SSL socket, the timeout value of the original
  socket wasn't retained (instead, a socket with a positive timeout would be
  turned into a non-blocking SSL socket).
1621

1622 1623 1624
- Issue #5103: SSL handshake would ignore the socket timeout and block
  indefinitely if the other end didn't respond.

1625 1626
- The do_handshake() method of SSL objects now adjusts the blocking mode of the
  SSL structure if necessary (as other methods already do).
1627

1628 1629
- Issue #8391: os.execvpe() and os.getenv() supports unicode with surrogates and
  bytes strings for environment keys and values.
1630

1631 1632
- Issue #8467: Pure Python implementation of subprocess encodes the error
  message using surrogatepass error handler to support surrogates in the
1633
  message.
1634

1635
- Issue #8468: bz2.BZ2File() accepts str with surrogates and bytes filenames.
1636

1637 1638 1639
- Issue #8451: Syslog module now uses basename(sys.argv[0]) instead of the
  string "python" as the *ident*.  openlog() arguments are all optional and
  keywords.
1640

1641 1642
- Issue #8108: Fix the unwrap() method of SSL objects when the socket has a
  non-infinite timeout.  Also make that method friendlier with applications
1643 1644 1645
  wanting to continue using the socket in clear-text mode, by disabling
  OpenSSL's internal readahead.  Thanks to Darryl Miles for guidance.

1646 1647 1648
- Issue #8496: make mailcap.lookup() always return a list, rather than an
  iterator.  Patch by Gregory Nofi.

1649 1650 1651
- Issue #8195: Fix a crash in sqlite Connection.create_collation() if the
  collation name contains a surrogate character.

1652 1653 1654
- Issue #8484: Load all ciphers and digest algorithms when initializing the _ssl
  extension, such that verification of some SSL certificates doesn't fail
  because of an "unknown algorithm".
1655

1656 1657
- Issue #6547: Added the ignore_dangling_symlinks option to shutil.copytree.

1658
- Issue #1540112: Now allowing the choice of a copy function in shutil.copytree.
1659

1660 1661 1662
- Issue #4814: timeout parameter is now applied also for connections resulting
  from PORT/EPRT commands.

1663 1664
- Issue #8463: added missing reference to bztar in shutil's documentation.

1665 1666
- Issue #7154: urllib.request can now detect the proxy settings on OSX 10.6 (as
  long as the user didn't specify 'automatic proxy configuration').
1667

1668 1669
- Issue #3817: ftplib.FTP.abort() method now considers 225 a valid response code
  as stated in RFC-959 at chapter 5.4.
1670

1671 1672 1673
- Issue #8394: _ctypes.dlopen() accepts bytes, bytearray and str with
  surrogates.

1674
- Issue #850728: Add a *timeout* parameter to the `acquire()` method of
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1675
  `threading.Semaphore` objects.  Original patch by Torsten Landschoff.
1676

1677 1678 1679
- Issue #8322: Add a *ciphers* argument to SSL sockets, so as to change the
  available cipher list.  Helps fix test_ssl with OpenSSL 1.0.0.

1680 1681 1682
- Issue #8393: subprocess accepts bytes, bytearray and str with surrogates for
  the current working directory.

1683
- Issue #7606: XML-RPC traceback stored in X-traceback is now encoded to ASCII
1684
  using backslashreplace error handler.
1685

1686
- Issue #8412: os.system() now accepts bytes, bytearray and str with surrogates.
1687

1688 1689 1690
- Issue #2987: RFC2732 support for urlparse (IPv6 addresses). Patch by Tony
  Locke and Hans Ulrich Niedermann.

1691 1692
- Issue #5277: Fix quote counting when parsing RFC 2231 encoded parameters.

1693
- Issue #7316: The acquire() method of lock objects in the :mod:`threading`
1694
  module now takes an optional timeout argument in seconds.  Timeout support
1695
  relies on the system threading library, so as to avoid a semi-busy wait loop.
1696

1697 1698
- Issue #8383: pickle and pickletools use surrogatepass error handler when
  encoding unicode as utf8 to support lone surrogates and stay compatible with
1699
  Python 2.x and 3.x.
1700

1701
- Issue #7585: difflib context and unified diffs now place a tab between
1702 1703
  filename and date, conforming to the 'standards' they were originally designed
  to follow.  This improves compatibility with patch tools.
1704

1705
- Issue #7472: Fixed typo in email.encoders module; messages using ISO-2022
1706 1707
  character sets will now consistently use a Content-Transfer-Encoding of 7bit
  rather than sometimes being marked as 8bit.
1708

1709 1710 1711
- Issue #8375: test_distutils now checks if the temporary directory are still
  present before it cleans them.

1712 1713
- Issue #8374: Update the internal alias table in the :mod:`locale` module to
  cover recent locale changes and additions.
1714

1715
- Issue #8321: Give access to OpenSSL version numbers from the `ssl` module,
1716 1717
  using the new attributes `ssl.OPENSSL_VERSION`, `ssl.OPENSSL_VERSION_INFO` and
  `ssl.OPENSSL_VERSION_NUMBER`.
1718

1719 1720
- Add functools.total_ordering() and functools.cmp_to_key().

1721 1722
- Issue #8257: The Decimal construct now accepts a float instance directly,
  converting that float to a Decimal of equal value:
1723 1724 1725 1726

     >>> Decimal(1.1)
     Decimal('1.100000000000000088817841970012523233890533447265625')

1727 1728
- Issue #8294: The Fraction constructor now accepts Decimal and float instances
  directly.
1729

1730 1731 1732 1733
- Issue #7279: Comparisons involving a Decimal signaling NaN now signal
  InvalidOperation instead of returning False.  (Comparisons involving a quiet
  NaN are unchanged.)  Also, Decimal quiet NaNs are now hashable; Decimal
  signaling NaNs remain unhashable.
1734

1735 1736 1737 1738 1739
- Issue #2531: Comparison operations between floats and Decimal instances now
  return a result based on the numeric values of the operands; previously they
  returned an arbitrary result based on the relative ordering of id(float) and
  id(Decimal).  See also issue #8188, which adds Decimal-to-Fraction
  comparisons.
1740

1741 1742
- Added a subtract() method to collections.Counter().

1743
- Issue #8233: When run as a script, py_compile.py optionally takes a single
1744 1745 1746
  argument `-` which tells it to read files to compile from stdin.  Each line is
  read on demand and the named file is compiled immediately.  (Original patch by
  Piotr Ożarowski).
1747

1748 1749
- Backwards incompatible change: Unicode codepoints line tabulation (0x0B) and
  form feed (0x0C) are now considered linebreaks, as specified in Unicode
1750
  Standard Annex #14.  See issue #7643.  http://www.unicode.org/reports/tr14/
1751

1752 1753 1754 1755
- Comparisons using one of <, <=, >, >= between a complex instance and a
  Fractions instance now raise TypeError instead of returning True/False.  This
  makes Fraction <=> complex comparisons consistent with int <=> complex, float
  <=> complex, and complex <=> complex comparisons.
1756

1757 1758 1759
- Issue #8139: ossaudiodev didn't initialize its types properly, therefore some
  methods (such as oss_mixer_device.fileno()) were not available.  Initial patch
  by Bertrand Janin.
1760

1761 1762 1763
- Issue #8205: Remove the "Modules" directory from sys.path when Python is
  running from the build directory (POSIX only).

1764
- Issue #7512: shutil.copystat() could raise an OSError when the filesystem
1765 1766
  didn't support chflags() (for example ZFS under FreeBSD).  The error is now
  silenced.
1767

1768 1769
- Issue #7860: platform.uname now reports the correct 'machine' type when Python
  is running in WOW64 mode on 64 bit Windows.
1770

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1771 1772 1773
- Issue #3890, #8222: Fix recv() and recv_into() on non-blocking SSL sockets.
  Also, enable the SSL_MODE_AUTO_RETRY flag on SSL sockets, so that blocking
  reads and writes are always retried by OpenSSL itself.
1774

1775 1776 1777 1778
- Issue #4282: Fix the main function of the profile module for a non-ASCII
  script, open the file in binary mode and not in text mode with the default
  (utf8) encoding.

1779 1780
- Issue #8179: Fix macpath.realpath() on a non-existing path.

1781 1782
- Issue #8024: Update the Unicode database to 5.2.

1783 1784
- Issue #8168: py_compile now handles files with utf-8 BOMS.

1785 1786 1787
- ``tokenize.detect_encoding`` now returns ``'utf-8-sig'`` when a UTF-8 BOM is
  detected.

1788 1789
- Issue #6716/2: Backslash-replace error output in compilall.

1790 1791 1792
- Issue #4961: Inconsistent/wrong result of askyesno function in tkMessageBox
  with Tcl/Tk-8.5.

1793
- Issue #8140: extend compileall to compile single files.  Add -i option.
1794

1795 1796
- Issue #7356: ctypes.util: Make parsing of ldconfig output independent of the
  locale.
1797

1798 1799 1800
- The internals of the subprocess module on POSIX systems have been replaced by
  an extension module (_posixsubprocess) so that the fork()+exec() can be done
  safely without the possibility of deadlock in multithreaded applications.
1801

1802 1803 1804 1805
- subprocess.Popen now has restore_signals and start_new_session features.  The
  default of restore_signals=True is a new behavior compared to earlier Python
  versions.  This means that signals such as SIGPIPE are not ignored by default
  in subprocesses launched by Python (Issue #1652).
1806

1807 1808 1809
- Issue #6472: The xml.etree package is updated to ElementTree 1.3.  The
  cElementTree module is updated too.

1810
- Issue #7774: Set sys.executable to an empty string if argv[0] has been set to
1811 1812
  an non existent program name and Python is unable to retrieve the real program
  name.
1813

1814 1815
- Issue #7880: Fix sysconfig when the python executable is a symbolic link.

1816 1817
- Issue #6509: fix re.sub to work properly when the pattern, the string, and the
  replacement were all bytes.  Patch by Antoine Pitrou.
1818

1819 1820 1821
- The sqlite3 module was updated to pysqlite 2.6.0. This fixes several obscure
  bugs and allows loading SQLite extensions from shared libraries.

1822 1823
- Issue #1054943: Fix ``unicodedata.normalize('NFC', text)`` for the Public
  Review Issue #29 (http://unicode.org/review/pr-29.html).
1824

1825 1826 1827
- Issue #7494: fix a crash in _lsprof (cProfile) after clearing the profiler,
  reset also the pointer to the current pointer context.

1828 1829 1830
- Issue #7232: Add support for the context manager protocol to the TarFile
  class.

1831 1832 1833
- Issue #7250: Fix info leak of os.environ across multi-run uses of
  wsgiref.handlers.CGIHandler.

1834 1835
- Issue #1729305: Fix doctest to handle encode error with "backslashreplace".

1836 1837 1838
- Issue #691291: codecs.open() should not convert end of lines on reading and
  writing.

1839 1840 1841 1842 1843 1844
- Issue #7869: logging: improved diagnostic for format-time errors.

- Issue #7868: logging: added loggerClass attribute to Manager.

- logging: Implemented PEP 391.

1845
- Issue #1537721: Add a writeheader() method to csv.DictWriter.
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1846

1847 1848
- Issue #7959: ctypes callback functions are now registered correctly with the
  cycle garbage collector.
1849

1850 1851
- Issue #5801: removed spurious empty lines in wsgiref.

1852 1853
- Issue #6666: fix bug in trace.py that applied the list of directories to be
  ignored only to the first file.  Noted by Bogdan Opanchuk.
1854

1855 1856
- Issue #7597: curses.use_env() can now be called before initscr().  Noted by
  Kan-Ru Chen.
1857

1858 1859
- Issue #7310: fix the __repr__ of os.environ to show the environment variables.

1860 1861 1862
- Issue #7970: email.Generator.flatten now correctly flattens message/rfc822
  messages parsed by email.Parser.HeaderParser.

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1863 1864 1865
- Issue #7361: Importlib was not properly checking the number of bytes in
  bytecode file when it was less then 8 bytes.

1866 1867 1868 1869
- Issue #7633: In the decimal module, Context class methods (with the exception
  of canonical and is_canonical) now accept instances of int and long wherever a
  Decimal instance is accepted, and implicitly convert that argument to Decimal.
  Previously only some arguments were converted.
1870

1871 1872 1873
- Issue #7835: shelve should no longer produce mysterious warnings during
  interpreter shutdown.

1874 1875 1876 1877
- Issue #2746: Don't escape ampersands and angle brackets ("&", "<", ">") in XML
  processing instructions and comments.  These raw characters are allowed by the
  XML specification, and are necessary when outputting e.g.  PHP code in a
  processing instruction.  Patch by Neil Muller.
1878

1879 1880 1881
- Issue #6233: ElementTree failed converting unicode characters to XML entities
  when they could't be represented in the requested output encoding.  Patch by
  Jerry Chen.
1882

1883 1884
- Issue #6003: add an argument to ``zipfile.Zipfile.writestr`` to specify the
  compression type.
1885

1886 1887
- Issue #4772: Raise a ValueError when an unknown Bluetooth protocol is
  specified, rather than fall through to AF_PACKET (in the `socket` module).
1888 1889
  Also, raise ValueError rather than TypeError when an unknown TIPC address type
  is specified.  Patch by Brian Curtin.
1890

1891 1892 1893
- Issue #6939: Fix file I/O objects in the `io` module to keep the original file
  position when calling `truncate()`.  It would previously change the file
  position to the given argument, which goes against the tradition of
1894 1895
  ftruncate() and other truncation APIs.  Patch by Pascal Chambon.

1896
- Issue #7610: Reworked implementation of the internal
1897 1898 1899 1900 1901
  :class:`zipfile.ZipExtFile` class used to represent files stored inside an
  archive.  The new implementation is significantly faster and can be wrapped in
  a :class:`io.BufferedReader` object for more speedups.  It also solves an
  issue where interleaved calls to `read()` and `readline()` give wrong results.
  Patch by Nir Aides.
1902

1903
- Issue #6963: Added "maxtasksperchild" argument to multiprocessing.Pool,
1904 1905
  allowing for a maximum number of tasks within the pool to be completed by the
  worker before that worker is terminated, and a new one created to replace it.
1906

1907 1908
- Issue #7792: Registering non-classes to ABCs raised an obscure error.

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1909
- Issue #7785: Don't accept bytes in FileIO.write().
1910

1911 1912
- Removed the functions 'verify' and 'vereq' from Lib/test/support.py.

1913 1914 1915
- Issue #7773: Fix an UnboundLocalError in platform.linux_distribution() when
  the release file is empty.

1916 1917 1918
- Issue #7561: Fix crashes when using bytearray objects with the posix
  module.

1919 1920 1921
- Issue #1670765: Prevent email.generator.Generator from re-wrapping headers in
  multipart/signed MIME parts, which fixes one of the sources of invalid
  modifications to such parts by Generator.
1922

1923 1924
- Issue #7703: Add support for the new buffer API to `binascii.a2bhqx`.  Patch
  by Florent Xicluna, along with some additional tests.
1925

1926 1927
- Issue #7701: Fix crash in binascii.b2a_uu() in debug mode when given a 1-byte
  argument.  Patch by Victor Stinner.
1928

1929 1930
- Issue #3299: Fix possible crash in the _sre module when given bad argument
  values in debug mode.  Patch by Victor Stinner.
1931

1932 1933
- Issue #2846: Add support for gzip.GzipFile reading zero-padded files.  Patch
  by Brian Curtin.
1934

1935 1936
- Issue #7681: Use floor division in appropiate places in the wave module.

1937 1938 1939 1940
- Issue #5372: Drop the reuse of .o files in Distutils' ccompiler (since
  Extension extra options may change the output without changing the .c
  file). Initial patch by Collin Winter.

1941 1942
- Issue #7617: Make sure distutils.unixccompiler.UnixCCompiler recognizes gcc
  when it has a fully qualified configuration prefix. Initial patch by Arfrever.
1943

1944 1945
- Issue #7105: Make WeakKeyDictionary and WeakValueDictionary robust against the
  destruction of weakref'ed objects while iterating.
1946

1947 1948
- Issue #7455: Fix possible crash in cPickle on invalid input.  Patch by Victor
  Stinner.
1949

1950
- Issue #1628205: Socket file objects returned by socket.socket.makefile() now
1951 1952
  properly handles EINTR within the read, readline, write & flush methods.  The
  socket.sendall() method now properly handles interrupted system calls.
1953

1954 1955 1956
- Issue #7471: Improve the performance of GzipFile's buffering mechanism, and
  make it implement the `io.BufferedIOBase` ABC to allow for further speedups by
  wrapping it in an `io.BufferedReader`.  Patch by Nir Aides.
1957 1958

- Issue #3972: http.client.HTTPConnection now accepts an optional source_address
1959 1960 1961 1962
  parameter to allow specifying where your connections come from.

- socket.create_connection now accepts an optional source_address parameter.

1963 1964
- Issue #5511: now zipfile.ZipFile can be used as a context manager.  Initial
  patch by Brian Curtin.
1965

1966 1967 1968
- Issue #7556: Make sure Distutils' msvc9compile reads and writes the MSVC XML
  Manifest file in text mode so string patterns can be used in regular
  expressions.
1969

1970 1971 1972
- Issue #7552: Removed line feed in the base64 Authorization header in the
  Distutils upload command to avoid an error when PyPI reads it.  This occurs on
  long passwords. Initial patch by JP St. Pierre.
1973

1974 1975 1976
- Issue #7231: urllib2 cannot handle https with proxy requiring auth.  Patch by
  Tatsuhiro Tsujikawa.

1977 1978 1979
- Issue #4757: `zlib.compress` and other methods in the zlib module now raise a
  TypeError when given an `str` object (rather than a `bytes`-like object).
  Patch by Victor Stinner and Florent Xicluna.
1980

1981 1982 1983 1984
- Issue #7349: Make methods of file objects in the io module accept None as an
  argument where file-like objects (ie StringIO and BytesIO) accept them to mean
  the same as passing no argument.

1985
- Issue #7357: tarfile no longer suppresses fatal extraction errors by default.
1986

1987 1988
- Issue #5949: added check for correct lineends in input from IMAP server in
  imaplib.
1989

1990
- Add count() and reverse() methods to collections.deque().
1991

1992 1993
- Fix variations of extending deques:  d.extend(d)  d.extendleft(d)  d+=d

1994 1995
- Issue #6986: Fix crash in the JSON C accelerator when called with the wrong
  parameter types.  Patch by Victor Stinner.
1996

1997
- Issue #7457: added a read_pkg_file method to
1998 1999
  distutils.dist.DistributionMetadata.

2000 2001 2002
- logging: Added optional `secure` parameter to SMTPHandler, to enable use of
  TLS with authentication credentials.

2003 2004
- Issue #1923: Fixed the removal of meaningful spaces when PKG-INFO is generated
  in Distutils.  Patch by Stephen Emslie.
2005

2006 2007 2008
- Issue #4120: Drop reference to CRT from manifest when building extensions with
  msvc9compiler.

2009
- Issue #7333: The `posix` module gains an `initgroups()` function providing
2010 2011
  access to the initgroups(3) C library call on Unix systems which implement it.
  Patch by Jean-Paul Calderone.
2012

2013 2014 2015 2016
- Issue #7408: Fixed distutils.tests.sdist so it doesn't check for group
  ownership when the group is not forced, because the group may be different
  from the user's group and inherit from its container when the test is run.

2017
- Issue #4486: When an exception has an explicit cause, do not print its
2018 2019
  implicit context too.  This affects the `traceback` module as well as built-in
  exception printing.
2020

2021 2022
- Issue #1515: Enable use of deepcopy() with instance methods.  Patch by Robert
  Collins.
2023

2024 2025
- Issue #7403: logging: Fixed possible race condition in lock creation.

2026 2027 2028 2029
- Issue #6845: Add restart support for binary upload in ftplib.  The
  `storbinary()` method of FTP and FTP_TLS objects gains an optional `rest`
  argument.  Patch by Pablo Mouzo.

2030 2031 2032
- Issue #5788: `datetime.timedelta` objects get a new `total_seconds()` method
  returning the total number of seconds in the duration.  Patch by Brian
  Quinlan.
2033

2034 2035
- Issue #7133: SSL objects now support the new buffer API.

2036
- Issue #1488943: difflib.Differ() doesn't always add hints for tab characters.
2037

2038 2039 2040
- Issue #6123: tarfile now opens empty archives correctly and consistently
  raises ReadError on empty files.

2041
- Issue #7354: distutils.tests.test_msvc9compiler - dragfullwindows can be 2.
2042

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2043 2044
- Issue #5037: Proxy the __bytes__ special method instead to __bytes__ instead
  of __str__.
2045

2046 2047
- Issue #7341: Close the internal file object in the TarFile constructor in case
  of an error.
2048

2049 2050 2051
- Issue #7293: distutils.test_msvc9compiler is fixed to work on any fresh
  Windows box. Help provided by David Bolen.

2052 2053
- Issue #2054: ftplib now provides an FTP_TLS class to do secure FTP using TLS
  or SSL.  Patch by Giampaolo Rodola'.
2054

2055
- Issue #7328: pydoc no longer corrupts sys.path when run with the '-m' switch.
2056

2057 2058
- Issue #4969: The mimetypes module now reads the MIME database from the
  registry under Windows.  Patch by Gabriel Genellina.
2059

2060 2061 2062 2063
- Issue #6816: runpy now provides a run_path function that allows Python code to
  execute file paths that refer to source or compiled Python files as well as
  zipfiles, directories and other valid sys.path entries that contain a
  __main__.py file.  This allows applications that run other Python scripts to
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  support the same flexibility as the CPython command line itself.

2066 2067 2068
- Issue #7318: multiprocessing now uses a timeout when it fails to establish a
  connection with another process, rather than looping endlessly.  The default
  timeout is 20 seconds, which should be amply sufficient for local connections.
2069

2070
- Issue #7197: Allow unittest.TextTestRunner objects to be pickled and
2071
  unpickled.  This fixes crashes under Windows when trying to run
2072 2073
  test_multiprocessing in verbose mode.

2074 2075 2076
- Issue #7893: ``unittest.TextTestResult`` is made public and a ``resultclass``
  argument added to the TextTestRunner constructor allowing a different result
  class to be used without having to subclass.
2077

2078
- Issue #7588: ``unittest.TextTestResult.getDescription`` now includes the test
2079 2080
  name in failure reports even if the test has a docstring.

2081
- Issue #3001: Add a C implementation of recursive locks which is used by
2082 2083 2084
  default when instantiating a `threading.RLock` object. This makes recursive
  locks as fast as regular non-recursive locks (previously, they were slower by
  10x to 15x).
2085

2086 2087
- Issue #7282: Fix a memory leak when an RLock was used in a thread other than
  those started through `threading.Thread` (for example, using
2088 2089
  `_thread.start_new_thread()`).

2090 2091 2092
- Issue #7187: Importlib would not silence the IOError raised when trying to
  write new bytecode when it was made read-only.

2093 2094 2095
- Issue #7264: Fix a possible deadlock when deallocating thread-local objects
  which are part of a reference cycle.

2096 2097 2098
- Issue #7211: Allow 64-bit values for the `ident` and `data` fields of kevent
  objects on 64-bit systems.  Patch by Michael Broghton.

2099 2100 2101
- Issue #6896: mailbox.Maildir now invalidates its internal cache each time a
  modification is done through it.  This fixes inconsistencies and test failures
  on systems with slightly bogus mtime behaviour.
2102

2103 2104 2105 2106
- Issue #7246 & Issue #7208: getpass now properly flushes input before reading
  from stdin so that existing input does not confuse it and lead to incorrect
  entry or an IOError.  It also properly flushes it afterwards to avoid the
  terminal echoing the input afterwards on OSes such as Solaris.
2107

2108 2109 2110 2111
- Issue #7233: Fix a number of two-argument Decimal methods to make sure that
  they accept an int or long as the second argument.  Also fix buggy handling of
  large arguments (those with coefficient longer than the current precision) in
  shift and rotate.
2112

2113 2114 2115
- Issue #4750: Store the basename of the original filename in the gzip FNAME
  header as required by RFC 1952.

2116 2117 2118
- Issue #1180: Added a new global option to ignore ~/.pydistutils.cfg in
  Distutils.

2119 2120 2121
- Issue #7218: Fix test_site for win32, the directory comparison was done with
  an uppercase.

2122 2123 2124
- Issue #7205: Fix a possible deadlock when using a BZ2File object from
  several threads at once.

2125 2126
- Issue #7077: logging: SysLogHandler now treats Unicode as per RFC 5424.

2127 2128 2129
- Issue #7099: Decimal.is_normal now returns True for numbers with exponent
  larger than emax.

2130 2131 2132
- Issue #7080: locale.strxfrm() raises a MemoryError on 64-bit non-Windows
  platforms, and assorted locale fixes by Derk Drukker.

2133 2134
- Issue #5833: Fix extra space character in readline completion with the GNU
  readline library version 6.0.
2135

2136
- Issue #6894: Fixed the issue urllib2 doesn't respect "no_proxy" environment.
2137

2138 2139
- Issue #7086: Added TCP support to SysLogHandler, and tidied up some
  anachronisms in the code which were a relic of 1.5.2 compatibility.
2140

2141 2142
- Issue #7082: When falling back to the MIME 'name' parameter, the correct place
  to look for it is the Content-Type header.
2143

2144 2145 2146
- Make tokenize.detect_coding() normalize utf-8 and iso-8859-1 variants like the
  builtin tokenizer.

2147 2148
- Issue #7048: Force Decimal.logb to round its result when that result is too
  large to fit in the current precision.
2149

2150 2151
- Issue #6236, #6348: Fix various failures in the I/O library under AIX and
  other platforms, when using a non-gcc compiler. Patch by Derk Drukker.
2152

2153 2154
- Issue #4606: Passing 'None' if ctypes argtype is set to POINTER(...)  does now
  always result in NULL.
2155

2156 2157
- Issue #5042: Structure sub-subclass does now initialize correctly with base
  class positional arguments.
2158

2159 2160
- Issue #6882: Import uuid creates zombies processes.

2161 2162
- Issue #6635: Fix profiler printing usage message.

2163 2164
- Issue #6856: Add a filter keyword argument to TarFile.add().

2165 2166
- Issue #6888: pdb's alias command was broken when no arguments were given.

2167
- Issue #6857: Default format() alignment should be '>' for Decimal instances.
2168

2169 2170 2171
- Issue #6795: int(Decimal('nan')) now raises ValueError instead of returning
  NaN or raising InvalidContext.  Also, fix infinite recursion in
  long(Decimal('nan')).
2172

2173 2174
- Issue #6850: Fix bug in Decimal._parse_format_specifier for formats with no
  type specifier.
2175

2176 2177
- Issue #6239: ctypes.c_char_p return value must return bytes.

2178 2179 2180 2181
- Issue #6838: Use a list to accumulate the value instead of repeatedly
  concatenating strings in http.client's HTTPResponse._read_chunked providing a
  significant speed increase when downloading large files servend with a
  Transfer-Encoding of 'chunked'.
2182

2183 2184 2185
- Trying to import a submodule from a module that is not a package, ImportError
  should be raised, not AttributeError.

2186 2187 2188
- When the globals past to importlib.__import__() has __package__ set to None,
  fall back to computing what __package__ should be instead of giving up.

2189
- Raise a TypeError when the name of a module to be imported for
2190
  importlib.__import__ is not a string (was raising an AttributeError before).
2191

2192 2193
- Allow the fromlist passed into importlib.__import__ to be any iterable.

2194 2195
- Have importlib raise ImportError if None is found in sys.modules.

2196 2197
- Issue #6054: Do not normalize stored pathnames in tarfile.

2198 2199 2200
- Issue #6794: Fix Decimal.compare_total and Decimal.compare_total_mag: NaN
  payloads are now ordered by integer value rather than lexicographically.

2201 2202 2203 2204 2205 2206 2207 2208 2209
- Issue #1356969: Add missing info methods in tix.HList.

- Issue #1522587: New constants and methods for the tix.Grid widget.

- Issue #1250469: Fix the return value of tix.PanedWindow.panes.

- Issue #1119673: Do not override tkinter.Text methods when creating a
  ScrolledText.

2210 2211
- Issue #6665: Fix fnmatch to properly match filenames with newlines in them.

2212 2213
- Issue #1135: Add the XView and YView mix-ins to avoid duplicating the xview*
  and yview* methods.
2214

2215 2216 2217 2218 2219
- Issue #6629: Fix a data corruption issue in the new I/O library, which could
  occur when writing to a BufferedRandom object (e.g. a file opened in "rb+" or
  "wb+" mode) after having buffered a certain amount of data for reading. This
  bug was not present in the pure Python implementation.

2220 2221
- Issue #6622: Fix "local variable 'secret' referenced before assignment" bug in
  POP3.apop.
2222

2223 2224
- Issue #2715: Remove remnants of Carbon.File from binhex module.

2225 2226 2227
- Issue #6595: The Decimal constructor now allows arbitrary Unicode decimal
  digits in input, as recommended by the standard.  Previously it was restricted
  to accepting [0-9].
2228

2229 2230 2231
- Issue #6106: telnetlib.Telnet.process_rawq doesn't handle default WILL/WONT
  DO/DONT correctly.

2232
- Issue #1424152: Fix for http.client, urllib.request to support SSL while
2233 2234
  working through proxy.  Original patch by Christopher Li, changes made by
  Senthil Kumaran.
2235

2236
- Add importlib.abc.ExecutionLoader to represent the PEP 302 protocol for
2237 2238 2239
  loaders that allow for modules to be executed. Both importlib.abc.PyLoader and
  PyPycLoader inherit from this class and provide implementations in relation to
  other methods required by the ABCs.
2240

2241 2242 2243 2244
- importlib.abc.PyLoader did not inherit from importlib.abc.ResourceLoader like
  the documentation said it did even though the code in PyLoader relied on the
  abstract method required by ResourceLoader.

2245 2246 2247
- Issue #6431: Make Fraction type return NotImplemented when it doesn't know how
  to handle a comparison without loss of precision.  Also add correct handling
  of infinities and nans for comparisons with float.
2248

Antoine Pitrou's avatar
Antoine Pitrou committed
2249
- Issue #6415: Fixed warnings.warn segfault on bad formatted string.
2250

2251 2252
- Issue #6358: The exit status of a command started with os.popen() was reported
  differently than it did with python 2.x.
2253

2254 2255
- Issue #6323: The pdb debugger did not exit when running a script with a syntax
  error.
2256

2257 2258 2259
- Issue #3392: The subprocess communicate() method no longer fails in select()
  when file descriptors are large; communicate() now uses poll() when possible.

2260 2261
- Issue #6369: Fix an RLE decompression bug in the binhex module.

2262 2263
- Issue #6344: Fixed a crash of mmap.read() when passed a negative argument.

Benjamin Peterson's avatar
Benjamin Peterson committed
2264 2265
- The deprecated function string.maketrans has been removed.

2266 2267 2268
- Issue #4005: Fixed a crash of pydoc when there was a zip file present in
  sys.path.

2269 2270
- Issue #6218: io.StringIO and io.BytesIO instances are now picklable.

2271 2272
- The os.get_exec_path() function to return the list of directories that will be
  searched for an executable when launching a subprocess was added.
2273

2274 2275 2276
- Issue #7481: When a threading.Thread failed to start it would leave the
  instance stuck in initial state and present in threading.enumerate().

2277 2278
- Issue #1068268: The subprocess module now handles EINTR in internal os.waitpid
  and os.read system calls where appropriate.
2279

2280 2281
- Issue #6729: Added ctypes.c_ssize_t to represent ssize_t.

2282 2283
- Issue #6247: The argparse module has been added to the standard library.

2284 2285
- Issue #8235: _socket: Add the constant ``SO_SETFIB``.  SO_SETFIB is a socket
  option available on FreeBSD 7.1 and newer.
2286

2287 2288 2289
- Issue #9315: Fix for the trace module to record correct class name
  for tracing methods.

2290 2291
Extension Modules
-----------------
2292

2293 2294 2295
- Issue #9959: Tweak formula used for computing math.log of an integer,
  making it marginally more accurate for exact powers of 2.

2296 2297
- Issue #9422: Fix memory leak when re-initializing a struct.Struct object.

2298
- Issue #7900: The getgroups(2) system call on MacOSX behaves rather oddly
2299 2300 2301 2302
  compared to other unix systems. In particular, os.getgroups() does not reflect
  any changes made using os.setgroups() but basicly always returns the same
  information as the id command. os.getgroups() can now return more than 16
  groups on MacOSX.
2303

2304 2305
- Issue #6095: Make directory argument to os.listdir optional.

2306 2307 2308
- Issue #9277: Fix bug in struct.pack for bools in standard mode (e.g.,
  struct.pack('>?')): if conversion to bool raised an exception then that
  exception wasn't properly propagated on machines where char is unsigned.
Mark Dickinson's avatar
Mark Dickinson committed
2309

2310 2311
- Issue #5180: Fixed a bug that prevented loading 2.x pickles in 3.x python when
  they contain instances of old-style classes.
2312

2313 2314
- Issue #9165: Add new functions math.isfinite and cmath.isfinite, to accompany
  existing isinf and isnan functions.
2315

2316 2317
- Issue #1578269: Implement os.symlink for Windows 6.0+.  Patch by Jason
  R. Coombs.
2318

Benjamin Peterson's avatar
Benjamin Peterson committed
2319 2320 2321
- In struct.pack, correctly propogate exceptions from computing the truth of an
  object in the '?' format.

2322 2323
- Issue #9000: datetime.timezone objects now have eval-friendly repr.

Benjamin Peterson's avatar
Benjamin Peterson committed
2324 2325
- In the math module, correctly lookup __trunc__, __ceil__, and __floor__ as
  special methods.
2326

2327 2328 2329 2330
- Issue #9005: Prevent utctimetuple() from producing year 0 or year 10,000.
  Prior to this change, timezone adjustment in utctimetuple() could produce
  tm_year value of 0 or 10,000.  Now an OverflowError is raised in these edge
  cases.
2331

2332 2333 2334 2335 2336 2337
- Issue #6641: The ``datetime.strptime`` method now supports the ``%z``
  directive.  When the ``%z`` directive is present in the format string, an
  aware ``datetime`` object is returned with ``tzinfo`` bound to a
  ``datetime.timezone`` instance constructed from the parsed offset.  If both
  ``%z`` and ``%Z`` are present, the data in ``%Z`` field is used for timezone
  name, but ``%Z`` data without ``%z`` is discarded.
2338

2339
- Issue #5094: The ``datetime`` module now has a simple concrete class
2340 2341 2342 2343 2344
  implementing ``datetime.tzinfo`` interface.  Instances of the new class,
  ``datetime.timezone``, return fixed name and UTC offset from their
  ``tzname(dt)`` and ``utcoffset(dt)`` methods.  The ``dst(dt)`` method always
  returns ``None``.  A class attribute, ``utc`` contains an instance
  representing the UTC timezone.  Original patch by Rafe Kaplan.
2345

2346 2347
- Issue #8973: Add __all__ to struct module; this ensures that help(struct)
  includes documentation for the struct.Struct class.
2348

2349
- Issue #3129: Trailing digits in struct format string are no longer ignored.
2350
  For example, "1" or "ilib123" are now invalid formats and cause
2351
  ``struct.error`` to be raised.  Patch by Caleb Deveraux.
2352

2353 2354 2355
- Issue #7384: If the system readline library is linked against ncurses, the
  curses module must be linked against ncurses as well. Otherwise it is not safe
  to load both the readline and curses modules in an application.
Stefan Krah's avatar
Stefan Krah committed
2356

2357 2358
- Issue #2810: Fix cases where the Windows registry API returns ERROR_MORE_DATA,
  requiring a re-try in order to get the complete result.
2359

2360 2361 2362 2363 2364
- Issue #8692: Optimize math.factorial: replace the previous naive algorithm
  with an improved 'binary-split' algorithm that uses fewer multiplications and
  allows many of the multiplications to be performed using plain C integer
  arithmetic instead of PyLong arithmetic.  Also uses a lookup table for small
  arguments.
2365

2366 2367 2368
- Issue #8674: Fixed a number of incorrect or undefined-behaviour-inducing
  overflow checks in the audioop module.

2369 2370
- Issue #8644: The accuracy of td.total_seconds() has been improved (by
  calculating with integer arithmetic instead of float arithmetic internally):
2371 2372
  the result is now always correctly rounded, and is equivalent to ``td /
  timedelta(seconds=1)``.
2373

2374 2375 2376
- Issue #2706: Allow division of a timedelta by another timedelta: timedelta /
  timedelta, timedelta % timedelta, timedelta // timedelta and divmod(timedelta,
  timedelta) are all supported.
2377

2378 2379
- Issue #8314: Fix unsigned long long bug in libffi on Sparc v8.

2380 2381 2382 2383 2384
- Issue #8300: When passing a non-integer argument to struct.pack with any
  integer format code, struct.pack first attempts to convert the non-integer
  using its __index__ method.  If that method is non-existent or raises
  TypeError it goes on to try the __int__ method, as described below.

2385 2386
- Issue #8142: Update libffi to the 3.0.9 release.

2387 2388
- Issue #6949: Allow the _dbm extension to be built with db 4.8.x.

2389
- Issue #6544: Fix a reference leak in the kqueue implementation's error
2390 2391
  handling.

2392 2393 2394
- Stop providing crtassem.h symbols when compiling with Visual Studio 2010, as
  msvcr100.dll is not a platform assembly anymore.

2395 2396
- Issue #6508: Add posix.{getresuid,getresgid,setresuid,setresgid}.

2397 2398
- Issue #7078: Set struct.__doc__ from _struct.__doc__.

2399
- Issue #3366: Add erf, erfc, expm1, gamma, lgamma functions to math module.
2400

2401 2402
- Issue #6877: It is now possible to link the readline extension to the libedit
  readline emulation on OSX 10.5 or later.
2403

2404 2405
- Issue #6848: Fix curses module build failure on OS X 10.6.

2406 2407
- Fix a segfault that could be triggered by expat with specially formed input.

2408 2409 2410
- Issue #6561: '\d' in a regex now matches only characters with Unicode category
  'Nd' (Number, Decimal Digit).  Previously it also matched characters with
  category 'No'.
2411

2412 2413
- Issue #4509: Array objects are no longer modified after an operation failing
  due to the resize restriction in-place when the object has exported buffers.
2414

2415 2416
- Issue #2389: Array objects are now pickled in a portable manner.

2417 2418 2419
- Expat: Fix DoS via XML document with malformed UTF-8 sequences
  (CVE_2009_3560).

2420 2421 2422
- Issue #7242: On Solaris 9 and earlier calling os.fork() from within a thread
  could raise an incorrect RuntimeError about not holding the import lock.  The
  import lock is now reinitialized after fork.
2423

2424 2425 2426
- Issue #7999: os.setreuid() and os.setregid() would refuse to accept a -1
  parameter on some platforms such as OS X.

2427 2428
- Build the ossaudio extension on GNU/kFreeBSD.

2429 2430
- Issue #7347: winreg: Add CreateKeyEx and DeleteKeyEx, as well as fix a bug in
  the return value of QueryReflectionKey.
2431

2432
- Issue #7567: PyCurses_setupterm: Don't call ``setupterm`` twice.
2433

2434 2435 2436
Build
-----

2437 2438
- Use OpenSSL 1.0.0a on Windows.

2439 2440
- Issue #9280: Make sharedinstall depend on sharedmods.

2441 2442 2443 2444 2445
- Issue #9189: Make a user-specified CFLAGS, CPPFLAGS, or LDFLAGS setting
  override the configure and makefile defaults, without deleting options the
  user didn't intend to override.  Developers should no longer need to specify
  OPT or EXTRA_CFLAGS, although those variables are still present for
  backward-compatibility.
2446

2447 2448
- Issue #8854: Fix finding Visual Studio 2008 on Windows x64.

2449 2450
- Issue #1759169, #8864: Drop _XOPEN_SOURCE on Solaris, define it for
  multiprocessing only.
2451

2452 2453 2454 2455
- Issue #8625: Turn off optimization in --with-pydebug builds with gcc.
  (Optimization was unintentionally turned on in gcc --with-pydebug builds as a
  result of the issue #1628484 fix, combined with autoconf's strange choice of
  default CFLAGS produced by AC_PROG_CC for gcc.)
2456

2457 2458
- Issue #3646: It is now easily possible to install a Python framework into your
  home directory on MacOSX, see Mac/README for more information.
2459

2460 2461
- Issue #3928: os.mknod() now available in Solaris, also.

2462 2463 2464
- Issue #3326: Build Python without -fno-strict-aliasing when the gcc does not
  give false warnings.

2465 2466 2467
- Issue #1628484: The Makefile doesn't ignore the CFLAGS environment variable
  anymore.  It also forwards the LDFLAGS settings to the linker when building a
  shared library.
2468

2469 2470
- Issue #6716: Quote -x arguments of compileall in MSI installer.  Exclude 2to3
  tests from compileall.
2471

2472
- Issue #3920, #7903: Define _BSD_SOURCE on OpenBSD 4.4 through 4.9.
2473

2474 2475 2476
- Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the private
  memory allocation scheme in dtoa.c and use PyMem_Malloc and PyMem_Free
  instead.  Also disable caching of powers of 5.
2477

2478 2479 2480 2481 2482
- Issue #6491: Allow --with-dbmliborder to specify that no dbms will be built.

- Issue #6943: Use pkg-config to find the libffi headers when the
  --with-system-ffi flag is used.

2483 2484 2485 2486
- Issue #7609: Add a --with-system-expat option that causes the system's expat
  library to be used for the pyexpat module instead of the one included with
  Python.

2487 2488 2489
- Issue #7589: Only build the nis module when the correct header files are
  found.

2490
- Switch to OpenSSL 0.9.8l and sqlite 3.6.21 on Windows.
2491

2492 2493 2494
- Issue #5792: Extend the short float repr support to x86 systems using
  icc or suncc.

2495 2496 2497
- Issue #6603: Change READ_TIMESTAMP macro in ceval.c so that it compiles
  correctly under gcc on x86-64.  This fixes a reported problem with the
  --with-tsc build on x86-64.
2498

2499
- Issue #6802: Fix build issues on MacOSX 10.6.
2500

2501 2502
- Issue #6244: Allow detect_tkinter to look for Tcl/Tk 8.6.

2503
- Issue #4601: 'make install' did not set the appropriate permissions on
2504 2505
  directories.

2506
- Issue #5390: Add uninstall icon independent of whether file extensions are
2507
  installed.
2508

2509
- Issue #7541: When using ``python-config`` with a framework install the
2510
  compiler might use the wrong library.
2511

2512 2513
- python-config now supports multiple options on the same command line.

2514 2515
- Issue #8509: Fix quoting in help strings and code snippets in configure.in.

2516 2517
- Issue #8510: Update to autoconf2.65.

2518
Documentation
2519
-------------
2520

2521 2522 2523
- Issue #9817: Add expat COPYING file; add expat, libffi and expat licenses
  to Doc/license.rst.

2524 2525 2526
- Issue #9524: Document that two CTRL* signals are meant for use only
  with os.kill.

2527
- Issue #9255: Document that the 'test' package is meant for internal Python use
2528 2529
  only.

2530
- A small WSGI server was added as Tools/scripts/serve.py, and is used to
2531 2532
  implement a local documentation server via 'make serve' in the doc directory.

2533 2534
- Updating `Using Python` documentation to include description of CPython's -J
  and -X options.
2535

2536 2537 2538
- Document that importing a module that has None in sys.modules triggers an
  ImportError.

2539 2540
- Issue #6556: Fixed the Distutils configuration files location explanation for
  Windows.
2541

2542 2543
- Update python manual page (options -B, -O0, -s, environment variables
  PYTHONDONTWRITEBYTECODE, PYTHONNOUSERSITE).
2544

2545 2546 2547
- Issue #8909: Added the size of the bitmap used in the installer created by
  distutils' bdist_wininst. Patch by Anatoly Techtonik.

2548 2549 2550
Tests
-----

2551 2552
- Issue #9251: test_threaded_import didn't fail when run through regrtest if the
  import lock was disabled.
2553

2554 2555
- Issue #8605: Skip test_gdb if Python is compiled with optimizations.

2556
- Issue #7449: Skip test_socketserver if threading support is disabled.
2557

2558 2559 2560
- Issue #8672: Add a zlib test ensuring that an incomplete stream can be handled
  by a decompressor object without errors (it returns incomplete uncompressed
  data).
2561

2562
- Issue #8533: regrtest uses backslashreplace error handler for stdout to avoid
2563
  UnicodeEncodeError (write non-ASCII character to stdout using ASCII encoding).
2564

2565 2566 2567
- Issue #8576: Remove use of find_unused_port() in test_smtplib and
  test_multiprocessing.  Patch by Paul Moore.

2568 2569 2570
- Issue #7449: Fix many tests to support Python compiled without thread
  support. Patches written by Jerry Seutter.

2571 2572
- Issue #8108: test_ftplib's non-blocking SSL server now has proper handling of
  SSL shutdowns.
2573

2574 2575
- Issues #8279, #8330, #8437, #8480, #8495: Fix test_gdb failures, patch written
  by Dave Malcolm.
2576

2577 2578
- Issue #3864: Skip three test_signal tests on freebsd6 because they fail if any
  thread was previously started, most likely due to a platform bug.
2579

2580 2581
- Issue #8193: Fix test_zlib failure with zlib 1.2.4.

2582 2583
- Issue #8248: Add some tests for the bool type.  Patch by Gregory Nofi.

2584 2585 2586
- Issue #8263: Now regrtest.py will report a failure if it receives a
  KeyboardInterrupt (SIGINT).

2587 2588
- Issue #8180 and #8207: Fix test_pep277 on OS X and add more tests for special
  Unicode normalization cases.
2589

2590 2591
- Issue #7783: test.support.open_urlresource invalidates the outdated files from
  the local cache.
2592

2593 2594 2595
- Issue #7849: Now the utility ``check_warnings`` verifies if the warnings are
  effectively raised.

2596 2597
- The four path modules (genericpath, macpath, ntpath, posixpath) share a common
  TestCase for some tests: test_genericpath.CommonTest.
2598

2599 2600
- Print platform information when running the whole test suite, or using the
  --verbose flag.
2601

2602 2603 2604
- Issue #767675: enable test_pep277 on POSIX platforms with Unicode-friendly
  filesystem encoding.

2605 2606
- Issue #6292: for the moment at least, the test suite runs cleanly if python is
  run with the -OO flag.  Tests requiring docstrings are skipped.
2607

2608 2609 2610 2611
- Issue #7712: test.support gained a new `temp_cwd` context manager which is now
  also used by regrtest to run all the tests in a temporary directory.  The
  original CWD is saved in `support.SAVEDCWD`.  Thanks to Florent Xicluna who
  helped with the patch.
2612

2613 2614 2615
- Issue #7924: Fix an intermittent 'XXX undetected error' failure in test_capi
  (only seen so far on platforms where the curses module wasn't built), due to
  an uncleared exception.
2616

2617 2618
- Issue #7728: test_timeout was changed to use support.bind_port instead of a
  hard coded port.
2619

2620
- Issue #7376: Instead of running a self-test (which was failing) when called
2621 2622
  with no arguments, doctest.py now gives a usage message.

2623 2624
- Issue #7396: fix regrtest -s, which was broken by the -j enhancement.

2625
- Issue #7498: test_multiprocessing now uses test.support.find_unused_port
2626 2627
  instead of a hardcoded port number in test_rapid_restart.

2628 2629 2630
- Issue #7431: Use TESTFN in test_linecache instead of trying to create a file
  in the Lib/test directory, which might be read-only for the user running the
  tests.
2631

2632 2633
- Issue #7324: Add a sanity check to regrtest argument parsing to catch the case
  of an option with no handler.
2634

2635 2636
- Issue #7312: Add a -F flag to run the selected tests in a loop until a test
  fails.  Can be combined with -j.
2637

2638 2639 2640 2641
- Issue #6551: test_zipimport could import and then destroy some modules of the
  encodings package, which would make other tests fail further down the road
  because the internally cached encoders and decoders would point to empty
  global variables.
2642

2643 2644
- Issue #7295: Do not use a hardcoded file name in test_tarfile.

2645 2646 2647
- Issue #7270: Add some dedicated unit tests for multi-thread synchronization
  primitives such as Lock, RLock, Condition, Event and Semaphore.

2648 2649 2650 2651
- Issue #7248 (part 2): Use a unique temporary directory for importlib source
  tests instead of tempfile.tempdir. This prevents the tests from sharing state
  between concurrent executions on the same system.

2652 2653 2654 2655
- Issue #7248: In importlib.test.source.util a try/finally block did not make
  sure that some referenced objects actually were created in the block before
  calling methods on the object.

2656
- Issue #7222: Make thread "reaping" more reliable so that reference
2657 2658 2659
  leak-chasing test runs give sensible results. The previous method of reaping
  threads could return successfully while some Thread objects were still
  referenced. This also introduces a new private function:
2660 2661
  :func:`_thread._count()`.

2662 2663
- Issue #7151: Fixed regrtest -j so that output to stderr from a test no longer
  runs the risk of causing the worker thread to fail.
2664

2665 2666 2667
- Issue #7055: test___all__ now greedily detects all modules which have an
  __all__ attribute, rather than using a hardcoded and incomplete list.

R. David Murray's avatar
R. David Murray committed
2668
- Issue #7058: Added save/restore for things like sys.argv and cwd to
2669 2670
  runtest_inner in regrtest, with warnings if the called test modifies them, and
  a new section in the summary report at the end.
2671

2672 2673
- Issue #7042: Fix test_signal (test_itimer_virtual) failure on OS X 10.6.

2674 2675 2676
- Fixed tests in importlib.test.source.test_abc_loader that were masking the
  proper exceptions that should be raised for missing or improper code object
  bytecode.
2677

2678
- Removed importlib's custom test discovery code and switched to
2679
  unittest.TestLoader.discover().
2680

2681 2682 2683
Tools/Demos
-----------

2684
- Issue #5464, #8974: Implement plural forms in msgfmt.py.
2685

2686
- iobench (a file I/O benchmark) and ccbench (a concurrency benchmark) were
2687
  added to the `Tools/` directory.  They were previously living in the sandbox.
2688

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What's New in Python 3.1?
=========================

*Release date: 27-June-2009*

Core and Builtins
-----------------

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Mark Dickinson committed
2698 2699 2700
- Issue #6334: Fix bug in range length calculation for ranges with
  large arguments.

2701 2702 2703
- Issue #6329: Fixed iteration for memoryview objects (it was being blocked
  because it wasn't recognized as a sequence).

2704 2705 2706
Library
-------

2707 2708
- Issue #6126: Fixed pdb command-line usage.

2709
- Issue #6314: logging: performs extra checks on the "level" argument.
2710

2711 2712
- Issue #6274: Fixed possible file descriptors leak in subprocess.py

2713 2714 2715
- Accessing io.StringIO.buffer now raises an AttributeError instead of
  io.UnsupportedOperation.

2716
- Issue #6271: mmap tried to close invalid file handle (-1) when anonymous.
2717 2718
  (On Unix)

2719 2720 2721
- Issue #1202: zipfile module would cause a struct.error when attempting to
  store files with a CRC32 > 2**31-1.

2722 2723 2724 2725 2726
Extension Modules
-----------------

- Issue #5590: Remove unused global variable in pyexpat extension.

2727

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2728 2729
What's New in Python 3.1 Release Candidate 2?
=============================================
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Benjamin Peterson's avatar
Benjamin Peterson committed
2731
*Release date: 13-June-2009*
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Core and Builtins
-----------------

2736 2737
- Fixed SystemError triggered by "range([], 1, -1)".

2738 2739 2740
- Issue #5924: On Windows, a large PYTHONPATH environment variable
  (more than 255 characters) would be completely ignored.

2741 2742 2743
- Issue #4547: When debugging a very large function, it was not always
  possible to update the lineno attribute of the current frame.

2744
- Issue #5330: C functions called with keyword arguments were not reported by
2745
  the various profiling modules (profile, cProfile). Patch by Hagen Fürstenau.
2746

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Library
-------

2750
- Issue #6438: Fixed distutils.cygwinccompiler.get_versions : the regular
2751
  expression string pattern was trying to match against a bytes returned by
2752 2753
  Popen. Tested under win32 to build the py-postgresql project.

2754 2755
- Issue #6258: Support AMD64 in bdist_msi.

2756 2757 2758
- Issue #6195: fixed doctest to no longer try to read 'source' data from
  binary files.

2759 2760 2761
- Issue #5262: Fixed bug in next rollover time computation in
  TimedRotatingFileHandler.

2762 2763 2764 2765
- Issue #6217: The C implementation of io.TextIOWrapper didn't include the
  errors property.  Additionally, the errors and encoding properties of StringIO
  are always None now.

2766 2767 2768 2769 2770
- Issue #6137: The pickle module now translates module names when loading
  or dumping pickles with a 2.x-compatible protocol, in order to make data
  sharing and migration easier. This behaviour can be disabled using the
  new `fix_imports` optional argument.

2771 2772
- Removed the ipaddr module.

2773 2774 2775 2776
- Issue #3613: base64.{encode,decode}string are now called
  base64.{encode,decode}bytes which reflects what type they accept and return.
  The old names are still there as deprecated aliases.

2777 2778
- Issue #5767: Remove sgmlop support from xmlrpc.client.

2779 2780
- Issue #6150: Fix test_unicode on wide-unicode builds.

2781 2782 2783
- Issue #6149: Fix initialization of WeakValueDictionary objects from non-empty
  parameters.

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Windows
-------

2787 2788
- Issue #6221: Delete test registry key before running the test.

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- Issue #6158: Package Sine-1000Hz-300ms.aif in MSI file.

2791 2792 2793 2794 2795 2796 2797
C-API
-----

- Issue #5735: Python compiled with --with-pydebug should throw an
  ImportError when trying to import modules compiled without
  --with-pydebug, and vice-versa.

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Build
-----

- Issue #6154: Make sure the intl library is added to LIBS if needed. Also
  added LIBS to OS X framework builds.

2805 2806 2807 2808
- Issue #5809: Specifying both --enable-framework and --enable-shared is
  an error. Configure now explicity tells you about this.


2809

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2810 2811
What's New in Python 3.1 release candidate 1?
=============================================
Benjamin Peterson's avatar
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2812

Benjamin Peterson's avatar
Benjamin Peterson committed
2813
*Release date: 2009-05-30*
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Core and Builtins
-----------------

2818 2819 2820
- Issue #6097: Escape UTF-8 surrogates resulting from mbstocs conversion
  of the command line.

2821 2822
- Issue #6012: Add cleanup support to O& argument parsing.

2823 2824 2825
- Issue #6089: Fixed str.format with certain invalid field specifiers
  that would raise SystemError.

2826 2827 2828
- Issue #5982: staticmethod and classmethod now expose the wrapped
  function with __func__.

2829 2830
- Added support for multiple context managers in the same with-statement.
  Deprecated contextlib.nested() which is no longer needed.
2831

2832 2833 2834 2835
- Issue #5829: complex("1e500") no longer raises OverflowError.  This
  makes it consistent with float("1e500") and interpretation of real
  and imaginary literals.

2836 2837
- Issue #3527: Removed Py_WIN_WIDE_FILENAMES which is not used any more.

2838 2839
- Issue #5994: the marshal module now has docstrings.

2840 2841 2842 2843 2844 2845
- Issue #5981: Fix three minor inf/nan issues in float.fromhex:
  (1) inf and nan strings with trailing whitespace were incorrectly
  rejected;  (2) parsing of strings representing infinities and nans
  was locale aware; and (3) the interpretation of fromhex('-nan')
  didn't match that of float('-nan').

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Library
-------

2849 2850
- Issue #4859: Implement PEP 383 for pwd, spwd, and grp.

2851 2852
- smtplib 'login' and 'cram-md5' login are also fixed (see Issue #5259).

2853 2854 2855
- Issue #6121: pydoc now ignores leading and trailing spaces in the
  argument to the 'help' function.

2856 2857 2858
- Issue #6118: urllib.parse.quote_plus ignored the encoding and errors
  arguments for strings with a space in them.

2859 2860 2861
- collections.namedtuple() was not working with the following field
  names:  cls, self, tuple, itemgetter, and property.

2862 2863 2864
- In unittest, using a skipping decorator on a class is now equivalent to
  skipping every test on the class.  The ClassTestSuite class has been removed.

2865 2866 2867
- Issue #6050: Don't fail extracting a directory from a zipfile if
  the directory already exists.

2868 2869 2870 2871
- Issue #1309352: fcntl now converts its third arguments to a C `long` rather
  than an int, which makes some operations possible under 64-bit Linux (e.g.
  DN_MULTISHOT with F_NOTIFY).

2872 2873 2874
- Issue #5761: Add the name of the underlying file to the repr() of various
  IO objects.

2875 2876 2877
- Issue #5259: smtplib plain auth login no longer gives a traceback.  Fix
  by Musashi Tamura, tests by Marcin Bachry.

2878 2879 2880 2881
- Issue #1983: Fix functions taking or returning a process identifier to use
  the dedicated C type ``pid_t`` instead of a C ``int``. Some platforms have
  a process identifier type wider than the standard C integer type.

2882 2883 2884
- Issue #4066: smtplib.SMTP_SSL._get_socket now correctly returns the socket.
  Patch by Farhan Ahmad, test by Marcin Bachry.

2885 2886 2887
- Issue #2116: Weak references and weak dictionaries now support copy()ing and
  deepcopy()ing.

2888 2889
- Issue #1655: Make imaplib IPv6-capable. Patch by Derek Morr.

2890 2891
- Issue #5918: Fix a crash in the parser module.

2892 2893
- Issue #1664: Make nntplib IPv6-capable. Patch by Derek Morr.

2894 2895 2896 2897 2898
- Issue #5006: Better handling of unicode byte-order marks (BOM) in the io
  library. This means, for example, that opening an UTF-16 text file in
  append mode doesn't add a BOM at the end of the file if the file isn't
  empty.

2899 2900 2901 2902
- Issue #4050: inspect.findsource/getsource now raise an IOError if the 'source'
  file is a binary.  Patch by Brodie Rao, tests by Daniel Diniz.  This fix
  corrects a pydoc regression.

2903
- Issue #5955: aifc's close method did not close the file it wrapped,
2904 2905
  now it does.  This also means getfp method now returns the real fp.

2906 2907 2908 2909 2910
Installation
------------

- Issue #6047: fullinstall has been removed because Python 3's executable will
  now be known as python3.
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2912 2913
- Lib/smtpd.py is no longer installed as a script.

2914 2915 2916
Extension Modules
-----------------

Martin v. Löwis's avatar
Martin v. Löwis committed
2917
- Issue #3061: Use wcsftime for time.strftime where available.
2918

2919 2920
- Issue #4873: Fix resource leaks in error cases of pwd and grp.

2921 2922
- Issue #6093: Fix off-by-one error in locale.strxfrm.

Benjamin Peterson's avatar
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2923 2924
- The _functools and _locale modules are now built into the libpython shared
  library instead of as extension modules.
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2925

2926 2927 2928 2929 2930 2931 2932
Build
-----

- Issue #3585: Add pkg-config support. It creates a python-2.7.pc file
  and a python3.pc symlink in the $(LIBDIR)/pkgconfig directory. Patch by
  Clinton Roy.

2933 2934 2935
Tests
-----

2936
- Issue #5442: Tests for importlib were not properly skipping case-sensitivity
2937 2938 2939 2940 2941
  tests on darwin even when the OS was installed on a case-sensitive
  filesystem. Also fixed tests that should not be run when
  sys.dont_write_bytecode is true.


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What's New in Python 3.1 beta 1?
================================

Benjamin Peterson's avatar
Benjamin Peterson committed
2945
*Release date: 2009-05-06*
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Benjamin Peterson committed
2946 2947 2948 2949

Core and Builtins
-----------------

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Mark Dickinson committed
2950 2951 2952
- Issue #5914: Add new C API function PyOS_string_to_double, and
  deprecate PyOS_ascii_strtod and PyOS_ascii_atof.

2953 2954 2955 2956
- Issue #3382: float.__format__, complex.__format__, and %-formatting
  no longer map 'F' to 'f'. Because of issue #5859 (below), this only
  affects nan -> NAN and inf -> INF.

2957 2958 2959 2960
- Issue #5799: ntpath (ie, os.path on Windows) fully supports UNC pathnames
  in all operations, including splitdrive, split, etc.  splitunc() now issues
  a PendingDeprecation warning.

2961 2962 2963 2964 2965 2966 2967 2968 2969
- Issue #5920: For float.__format__, change the behavior with the
  empty presentation type (that is, not one of 'e', 'f', 'g', or 'n')
  to be like 'g' but with at least one decimal point and with a
  default precision of 12. Previously, the behavior the same but with
  a default precision of 6.  This more closely matches str(), and
  reduces surprises when adding alignment flags to the empty
  presentation type. This also affects the new complex.__format__ in
  the same way.

2970 2971
- Implement PEP 383, Non-decodable Bytes in System Character Interfaces.

2972 2973 2974 2975
- Issue #5890: in subclasses of 'property' the __doc__ attribute was
  shadowed by classtype's, even if it was None.  property now
  inserts the __doc__ into the subclass instance __dict__.

2976 2977 2978
- Issue #4426: The UTF-7 decoder was too strict and didn't accept some legal
  sequences. Patch by Nick Barnes and Victor Stinner.

2979
- Issue #3672: Reject surrogates in utf-8 codec; add surrogatepass error handler.
2980

2981 2982 2983 2984
- Issue #5883: In the io module, the BufferedIOBase and TextIOBase ABCs have
  received a new method, detach().  detach() disconnects the underlying stream
  from the buffer or text IO and returns it.

2985 2986 2987 2988
- Issue #5859: Remove switch from '%f' to '%g'-style formatting for
  floats with absolute value over 1e50.  Also remove length
  restrictions for float formatting: '%.67f' % 12.34 and '%.120e' %
  12.34 no longer raise an exception.
2989

2990
- Issue #1588: Add complex.__format__. For example,
2991 2992
  format(complex(1, 2./3), '.5') now produces a sensible result.

2993 2994 2995
- Issue #5864: Fix empty format code formatting for floats so that it
  never gives more than the requested number of significant digits.

2996 2997 2998
- Issue #5793: Rationalize isdigit / isalpha / tolower, etc. Includes
  new Py_ISDIGIT / Py_ISALPHA / Py_TOLOWER, etc. in pctypes.h.

2999 3000
- Issue #5835: Deprecate PyOS_ascii_formatd.

3001 3002 3003
- Issue #4971: Fix titlecase for characters that are their own
  titlecase, but not their own uppercase.

3004 3005
- Issue #5283: Setting __class__ in __del__ caused a segfault.

3006 3007 3008
- Issue #5816: complex(repr(z)) now recovers z exactly, even when
  z involves nans, infs or negative zeros.

3009
- Issue #3166: Make int -> float conversions correctly rounded.
3010

3011 3012 3013 3014 3015
- Issue #1869 (and many duplicates): make round(x, n) correctly
  rounded for a float x, by using the decimal <-> binary conversions
  from Python/dtoa.c.  As a consequence, (e.g.) round(x, 2) now
  consistently agrees with format(x, '.2f').

3016 3017 3018
- Issue #5787: object.__getattribute__(some_type, "__bases__") segfaulted on
  some builtin types.

3019 3020
- Issue #5772: format(1e100, '<') produces '1e+100', not '1.0e+100'.

3021 3022
- Issue #5515: str.format() type 'n' combined with commas and leading
  zeros no longer gives odd results with ints and floats.
3023 3024 3025 3026

- Implement PEP 378, Format Specifier for Thousands Separator, for
  floats.

3027
- The str function switches to exponential notation at
3028 3029 3030 3031 3032 3033 3034 3035 3036
  1e11, not 1e12.  This avoids printing 13 significant digits in
  situations where only 12 of them are correct.  Example problem
  value: str(1e11 + 0.5).  (This minor issue has existed in 2.x for a
  long time.)

- Issue #1580: On most platforms, use a 'short' float repr: for a
  finite float x, repr(x) now outputs a string based on the shortest
  sequence of decimal digits that rounds to x.  Previous behaviour was
  to output 17 significant digits and then strip trailing zeros.
3037 3038 3039
  Another minor difference is that the new repr switches to
  exponential notation at 1e16 instead of the previous 1e17; this
  avoids misleading output in some cases.
3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051

  There's a new sys attribute sys.float_repr_style, which takes
  the value 'short' to indicate that we're using short float repr,
  and 'legacy' if the short float repr isn't available for one
  reason or another.

  The float repr change involves incorporating David Gay's 'perfect
  rounding' code into the Python core (it's in Python/dtoa.c).  As a
  secondary consequence, all string-to-float and float-to-string
  conversions (including all float formatting operations) will be
  correctly rounded on these platforms.

3052
  See issue #1580 discussions for details of platforms for which
3053 3054
  this change does not apply.

3055 3056
- Issue #5759: float() didn't call __float__ on str subclasses.

3057 3058 3059 3060 3061
- The string.maketrans() function is deprecated; there is a new static method
  maketrans() on the bytes and bytearray classes.  This removes confusion about
  the types string.maketrans() is supposed to work with, and mirrors the
  methods available on the str class.

3062 3063 3064
- Issue #2170: refactored xml.dom.minidom.normalize, increasing both
  its clarity and its speed.

3065
- Issue #1113244: Py_XINCREF, Py_DECREF, Py_XDECREF: Add ``do { ... } while (0)``
3066 3067
  to avoid compiler warnings.

3068 3069 3070
- Issue #3739: The unicode-internal encoder now reports the number of characters
  consumed like any other encoder (instead of the number of bytes).

3071 3072 3073 3074 3075
Installation
------------

- Issue #5756: Install idle and pydoc with a 3 suffix.

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3076 3077 3078
Library
-------

3079 3080
- Issue #8203: Fix IDLE Credits dialog: view_file() uses its encoding argument.

3081 3082 3083
- Issue #5311: bdist_msi can now build packages that do not depend on a
  specific Python version.

3084 3085 3086
- Issue #5150: IDLE's format menu now has an option to strip trailing
  whitespace.

3087
- Issue #5940: distutils.command.build_clib.check_library_list was not doing
3088 3089
  the right type checkings anymore.

3090 3091 3092
- Issue #4875: On win32, ctypes.util.find_library does no longer
  return directories.

3093 3094
- Issue #5142: Add the ability to skip modules while stepping to pdb.

3095 3096 3097
- Issue #1309567: Fix linecache behavior of stripping subdirectories when
  looking for files given by a relative filename.

3098 3099 3100
- Issue #5923: Update the ``turtle`` module to version 1.1, add two new
  turtle demos in Demo/turtle.

3101 3102 3103
- Issue #5692: In :class:`zipfile.Zipfile`, fix wrong path calculation when
  extracting a file to the root directory.

3104 3105
- Issue #5913: os.listdir() should fail for empty path on windows.

3106 3107 3108 3109
- Issue #5084: unpickling now interns the attribute names of pickled objects,
  saving memory and avoiding growth in size of subsequent pickles. Proposal
  and original patch by Jake McGuire.

3110 3111
- The json module now works exclusively with str and not bytes.

3112 3113 3114
- Issue #3959: The ipaddr module has been added to the standard library.
  Contributed by Google.

3115 3116 3117
- Issue #3002: ``shutil.copyfile()`` and ``shutil.copytree()`` now raise an
  error when a named pipe is encountered, rather than blocking infinitely.

3118 3119
- Issue #5857: tokenize.tokenize() now returns named tuples.

3120 3121
- Issue #4305: ctypes should now build again on mipsel-linux-gnu

3122 3123 3124 3125
- Issue #1734234: Massively speedup ``unicodedata.normalize()`` when the
  string is already in normalized form, by performing a quick check beforehand.
  Original patch by Rauli Ruohonen.

3126 3127 3128 3129
- Issue #5853: calling a function of the mimetypes module from several threads
  at once could hit the recursion limit if the mimetypes database hadn't been
  initialized before.

3130 3131 3132
- Issue #5854: Updated __all__ to include some missing names and remove some
  names which should not be exported.

3133 3134 3135 3136 3137
- Issue #3102:  All global symbols that the _ctypes extension defines
  are now prefixed with 'Py' or '_ctypes'.

- Issue #5041: ctypes does now allow pickling wide character.

3138 3139 3140 3141
- Issue #5812: For the two-argument form of the Fraction constructor,
  Fraction(m, n), m and n are permitted to be arbitrary Rational
  instances.

3142 3143 3144 3145
- Issue #5812: Fraction('1e6') is valid: more generally, any string
  that's valid for float() is now valid for Fraction(), with the
  exception of strings representing NaNs and infinities.

3146 3147 3148
- Issue #5734: BufferedRWPair was poorly tested and had several glaring
  bugs. Patch by Brian Quinlan.

3149 3150 3151 3152 3153 3154
- Issue #1161031: fix readwrite select flag handling: POLLPRI now
  results in a handle_expt_event call, not handle_read_event, and POLLERR
  and POLLNVAL now call handle_close, not handle_expt_event.  Also,
  dispatcher now has an 'ignore_log_types' attribute for suppressing
  log messages, which is set to 'warning' by default.

3155 3156
- Issue #2703: SimpleXMLRPCDispatcher.__init__: Provide default values for
  new arguments introduced in 2.5.
3157 3158 3159 3160

- Issue #5828 (Invalid behavior of unicode.lower): Fixed bogus logic in
  makeunicodedata.py and regenerated the Unicode database (This fixes
  u'\u1d79'.lower() == '\x00').
3161

3162 3163 3164
Extension Modules
-----------------

3165 3166 3167
- Issue #5881: Remove old undocumented compatibility interfaces in hashlib and
  pwd.

3168 3169 3170 3171 3172
- Issue #5463: In struct module, remove deprecated float coercion
  for integer type codes: struct.pack('L', 0.3) should now raise
  an error.  The _PY_STRUCT_FLOAT_COERCE constant has been removed.
  The version number has been bumped to 0.3.

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3173 3174
- Issue #5359: Readd the Berkeley DB detection code to allow _dbm be built
  using Berkeley DB.
3175

3176 3177 3178 3179 3180 3181 3182 3183 3184
Tests
-----

- Issue #5354: New test support function import_fresh_module() makes
  it easy to import both normal and optimised versions of modules.
  test_heapq and test_warnings have been adjusted to use it, tests for
  other modules with both C and Python implementations in the stdlib
  can be adjusted to use it over time.

3185 3186 3187 3188
- Issue #5837: Certain sequences of calls to set() and unset() for
  support.EnvironmentVarGuard objects restored the environment variables
  incorrectly on __exit__.

3189 3190 3191 3192 3193
C-API
-----

- Issue #5630: A replacement PyCObject API, PyCapsule, has been added.

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3194

3195 3196 3197
What's New in Python 3.1 alpha 2?
=================================

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3198
*Release date: 2009-4-4*
3199 3200 3201

Core and Builtins
-----------------
3202

3203 3204
- Implement PEP 378, Format Specifier for Thousands Separator, for
  integers.
3205

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Benjamin Peterson committed
3206 3207
- Issue #5666: Py_BuildValue's 'c' code should create byte strings.

3208 3209 3210
- Issue #5499: The 'c' code for argument parsing functions now only accepts a
  byte, and the 'C' code only accepts a unicode character.

3211 3212 3213
- Fix a problem in PyErr_NormalizeException that leads to "undetected errors"
  when hitting the recursion limit under certain circumstances.

3214 3215
- Issue #1665206: Remove the last eager import in _warnings.c and make it lazy.

3216 3217 3218
- Fix a segfault when running test_exceptions with coverage, caused by
  insufficient checks in accessors of Exception.__context__.

3219 3220 3221 3222
- Issue #5604: non-ASCII characters in module name passed to
  imp.find_module() were converted to UTF-8 while the path is
  converted to the default filesystem encoding, causing nonsense.

3223 3224
- Issue #5126: str.isprintable() returned False for space characters.

3225 3226 3227
- Issue #4865: On MacOSX /Library/Python/2.7/site-packages is added to
  the end sys.path, for compatibility with the system install of Python.

3228 3229 3230 3231 3232
- Issue #4688: Add a heuristic so that tuples and dicts containing only
  untrackable objects are not tracked by the garbage collector. This can
  reduce the size of collections and therefore the garbage collection overhead
  on long-running programs, depending on their particular use of datatypes.

3233 3234 3235 3236
- Issue #5512: Rewrite PyLong long division algorithm (x_divrem) to
  improve its performance.  Long divisions and remainder operations
  are now between 50% and 150% faster.

3237 3238 3239 3240 3241 3242 3243
- Issue #4258: Make it possible to use base 2**30 instead of base
  2**15 for the internal representation of integers, for performance
  reasons.  Base 2**30 is enabled by default on 64-bit machines.  Add
  --enable-big-digits option to configure, which overrides the
  default.  Add sys.int_info structseq to provide information about
  the internal format.

3244 3245 3246 3247
- Issue #4474: PyUnicode_FromWideChar now converts characters outside
  the BMP to surrogate pairs, on systems with sizeof(wchar_t) == 4
  and sizeof(Py_UNICODE) == 2.

3248 3249 3250
- Issue #5237: Allow auto-numbered fields in str.format(). For
  example: '{} {}'.format(1, 2) == '1 2'.

3251 3252 3253
- Issue #5392: when a very low recursion limit was set, the interpreter would
  abort with a fatal error after the recursion limit was hit twice.

3254 3255 3256
- Issue #3845: In PyRun_SimpleFileExFlags avoid invalid memory access with
  short file names.

3257 3258 3259
Library
-------

3260
- Issue #2625: added missing items() call to the for loop in
3261 3262
  mailbox.MH.get_message().

3263 3264 3265 3266
- Issue #5640: Fix _multibytecodec so that CJK codecs don't repeat
  error substitutions from non-strict codec error callbacks in
  incrementalencoder and StreamWriter.

3267 3268 3269
- Issue #5656: Fix the coverage reporting when running the test suite with
  the -T argument.

3270 3271
- Issue #5647: MutableSet.__iand__() no longer mutates self during iteration.

3272 3273
- Issue #5624: Fix the _winreg module name still used in several modules.

3274 3275
- Issue #5628: Fix io.TextIOWrapper.read() with a unreadable buffer.

3276 3277 3278
- Issue #5619: Multiprocessing children disobey the debug flag and causes
  popups on windows buildbots. Patch applied to work around this issue.

3279 3280
- Issue #5400: Added patch for multiprocessing on netbsd compilation/support

3281 3282
- Issue #5387: Fixed mmap.move crash by integer overflow.

Jesse Noller's avatar
Jesse Noller committed
3283 3284 3285
- Issue #5261: Patch multiprocessing's semaphore.c to support context
  manager use: "with multiprocessing.Lock()" works now.

3286 3287 3288
- Issue #5236: Change time.strptime() to only take strings. Didn't work with
  bytes already but the failure was non-obvious.

Jesse Noller's avatar
Jesse Noller committed
3289 3290 3291 3292
- Issue #5177: Multiprocessing's SocketListener class now uses
  socket.SO_REUSEADDR on all connections so that the user no longer needs
  to wait 120 seconds for the socket to expire.

Benjamin Peterson's avatar
Benjamin Peterson committed
3293 3294
- Issue #5595: Fix UnboundedLocalError in ntpath.ismount().

3295 3296 3297
- Issue #1174606: Calling read() without arguments of an unbounded file
  (typically /dev/zero under Unix) could crash the interpreter.

3298 3299 3300
- The max_buffer_size arguments of io.BufferedWriter, io.BufferedRWPair, and
  io.BufferedRandom have been deprecated for removal in Python 3.2.

3301 3302 3303 3304 3305
- Issue #5068: Fixed the tarfile._BZ2Proxy.read() method that would loop
  forever on incomplete input. That caused tarfile.open() to hang when used
  with mode 'r' or 'r:bz2' and a fileobj argument that contained no data or
  partial bzip2 compressed data.

3306 3307 3308
- Issue #2110: Add support for thousands separator and 'n' type
  specifier to Decimal.__format__

3309 3310 3311
- Fix Decimal.__format__ bug that swapped the meanings of the '<' and
  '>' alignment characters.

3312 3313 3314
- The error detection code in FileIO.close() could fail to reflect the `errno`
  value, and report it as -1 instead.

3315 3316 3317
- Issue #5016: FileIO.seekable() could return False if the file position
  was negative when truncated to a C int. Patch by Victor Stinner.

3318 3319 3320
Extension Modules
-----------------

3321 3322
- Issue #5391: mmap now deals exclusively with bytes.

3323 3324
- Issue #5463: In struct module, remove deprecated overflow wrapping
  when packing an integer: struct.pack('=L', -1) now raises
3325 3326 3327
  struct.error instead of returning b'\xff\xff\xff\xff'.  The
  _PY_STRUCT_RANGE_CHECKING and _PY_STRUCT_OVERFLOW_MASKING constants
  have been removed from the struct module.
3328

3329

Benjamin Peterson's avatar
Benjamin Peterson committed
3330
What's New in Python 3.1 alpha 1
Barry Warsaw's avatar
Barry Warsaw committed
3331
================================
Barry Warsaw's avatar
Barry Warsaw committed
3332

Benjamin Peterson's avatar
Benjamin Peterson committed
3333
*Release date: 2009-03-07*
Barry Warsaw's avatar
Barry Warsaw committed
3334 3335 3336 3337

Core and Builtins
-----------------

3338 3339
- The io module has been reimplemented in C for speed.

3340 3341
- Give dict views an informative __repr__.

3342 3343 3344
- Issue #5247: Improve error message when unknown format codes are
  used when using str.format() with str, int, and float arguments.

3345 3346 3347
- Issue #5249: time.strftime returned malformed string when format string
  contained non ascii character on windows.

3348 3349 3350
- Issue #4626: compile(), exec(), and eval() ignore the coding cookie if the
  source has already been decoded into str.

3351 3352 3353
- Issue #5186: Reduce hash collisions for objects with no __hash__ method by
  rotating the object pointer by 4 bits to the right.

3354 3355 3356
- Issue #4575: Fix Py_IS_INFINITY macro to work correctly on x87 FPUs:
  it now forces its argument to double before testing for infinity.

3357 3358 3359
- Issue #5137: Make len() correctly raise a TypeError when a __len__ method
  returns a non-number type.

3360 3361
- Issue #5182: Removed memoryview.__str__.

3362 3363
- Issue #1717: Removed builtin cmp() function, dropped tp_compare
  slot, the C API functions PyObject_Compare and PyUnicode_Compare and
3364 3365
  the type definition cmpfunc.  The tp_compare slot has been renamed
  to tp_reserved, and is reserved for future usage.
3366

3367
- Issue #1242657: the __len__() and __length_hint__() calls in several tools
3368 3369
  were suppressing all exceptions.  These include list() and bytearray().

3370 3371 3372
- Issue #4707: round(x, n) now returns an integer if x is an integer.
  Previously it returned a float.

3373 3374 3375 3376 3377
- Issue #4753: By enabling a configure option named '--with-computed-gotos'
  on compilers that support it (notably: gcc, SunPro, icc), the bytecode
  evaluation loop is compiled with a new dispatch mechanism which gives
  speedups of up to 20%, depending on the system, on various benchmarks.

3378 3379
- Issue #4874: Most builtin decoders now reject unicode input.

3380 3381 3382
- Issue #4842: Don't allow trailing 'L' when constructing an integer
  from a string.

3383 3384
- Issue #4991: os.fdopen now raises an OSError for invalid file descriptors.

3385 3386 3387
- Issue #4838: When a module is deallocated, free the memory backing the
  optional module state data.

3388
- Issue #4910: Rename nb_long slot to nb_reserved, and change its
3389
  type to ``(void *)``.
3390

3391 3392 3393 3394
- Issue #4935: The overflow checking code in the expandtabs() method common
  to str, bytes and bytearray could be optimized away by the compiler, letting
  the interpreter segfault instead of raising an error.

3395 3396 3397
- Issue #3720: Fix a crash when an iterator modifies its class and removes its
  __next__ method.

3398 3399 3400 3401
- Issue #4910: Builtin int() function and PyNumber_Long/PyNumber_Int API
  function no longer attempt to call the __long__ slot to convert an object
  to an integer.  Only the __int__ and __trunc__ slots are examined.

3402 3403
- Issue #4893: Use NT threading on CE.

3404 3405
- Issue #4915: Port sysmodule to Windows CE.

3406 3407 3408 3409
- Issue #4868: utf-8, utf-16 and latin1 decoding are now 2x to 4x faster. The
  common cases are optimized thanks to a dedicated fast path and a moderate
  amount of loop unrolling.

3410 3411 3412 3413 3414 3415
- Issue #4074: Change the criteria for doing a full garbage collection (i.e.
  collecting the oldest generation) so that allocating lots of objects without
  destroying them does not show quadratic performance. Based on a proposal by
  Martin von Löwis at
  http://mail.python.org/pipermail/python-dev/2008-June/080579.html.

3416
- Issue #4604: Some objects of the I/O library could still be used after
3417 3418 3419
  having been closed (for instance, a read() call could return some
  previously buffered data). Patch by Dmitry Vasiliev.

3420 3421 3422 3423 3424
- Issue #4705: Fix the -u ("unbuffered binary stdout and stderr") command-line
  flag to work properly. Furthermore, when specifying -u, the text stdout
  and stderr streams have line-by-line buffering enabled (the default being
  to buffer arbitrary chunks of data).

3425 3426 3427 3428
- The internal table, _PyLong_DigitValue, is now an array of unsigned chars
  instead of ints (reducing its size from 4 to 8 times thereby reducing
  Python's overall memory).

3429 3430 3431 3432 3433 3434
- Issue #1180193: When importing a module from a .pyc (or .pyo) file with
  an existing .py counterpart, override the co_filename attributes of all
  code objects if the original filename is obsolete (which can happen if the
  file has been renamed, moved, or if it is accessed through different paths).
  Patch by Ziga Seilnacht and Jean-Paul Calderone.

3435 3436 3437 3438
- Issue #4580: Fix slicing of memoryviews when the item size is greater than
  one byte. Also fixes the meaning of len() so that it returns the number of
  items, rather than the size in bytes.

3439 3440
- Issue #4075: Use OutputDebugStringW in Py_FatalError.

3441 3442 3443
- Issue #4747: When the terminal does not use utf-8, executing a script with
  non-ascii characters in its name could fail with a "SyntaxError: None" error.

3444 3445
- Issue #4797: IOError.filename was not set when ``_fileio.FileIO`` failed
  to open file with a bytes filename on Windows.
3446

3447 3448 3449
- Issue #3680: Reference cycles created through a dict, set or deque iterator
  did not get collected.

3450 3451 3452
- Issue #4701: PyObject_Hash now implicitly calls PyType_Ready on types
  where the tp_hash and tp_dict slots are both NULL.

3453 3454 3455
- Issue #4759: None is now allowed as the first argument of
  bytearray.translate().  It was always allowed for bytes.translate().

3456 3457 3458
- Added test case to ensure attempts to read from a file opened for writing
  fail.

3459 3460
- Issue #3106: Speedup some comparisons (str/str and int/int).

3461 3462 3463
- Issue #2183: Simplify and optimize bytecode for list, dict and set
  comprehensions. Original patch for list comprehensions by Neal Norwitz.

3464 3465 3466 3467
- Issue #2467: gc.DEBUG_STATS reported invalid elapsed times. Also, always
  print elapsed times, not only when some objects are uncollectable /
  unreachable. Original patch by Neil Schemenauer.

3468 3469
- Issue #3439: Add a bit_length method to int.

3470 3471 3472 3473
- Issue #2173: When getting device encoding, check that return value of
  nl_langinfo is not the empty string.  This was causing silent build
  failures on OS X.

3474 3475 3476 3477
- Issue #4597: Fixed several opcodes that weren't always propagating
  exceptions.

- Issue #4589: Fixed exception handling when the __exit__ function of a
3478 3479
  context manager returns a value that cannot be converted to a bool.

3480 3481 3482 3483 3484
- Issue #4445: Replace "sizeof(PyBytesObject)" with
  "offsetof(PyBytesObject, ob_sval) + 1" when allocating memory for
  bytes instances.  On a typical machine this saves 3 bytes of memory
  (on average) per allocation of a bytes instance.

3485 3486 3487 3488
- Issue #4533: File read operation was dreadfully slow due to a slowly
  growing read buffer. Fixed by using the same growth rate algorithm as
  Python 2.x.

3489 3490 3491
- Issue #4509: Various issues surrounding resize of bytearray objects to
  which there are buffer exports (e.g. memoryview instances).

3492 3493 3494 3495
- Issue #4233: Changed semantic of ``_fileio.FileIO``'s ``close()``
  method on file objects with closefd=False. The file descriptor is still
  kept open but the file object behaves like a closed file. The ``FileIO``
  object also got a new readonly attribute ``closefd``.
3496

3497 3498 3499
- Issue #4569: Interpreter crash when mutating a memoryview with an item size
  larger than 1.

3500 3501
- Issue #4748: Lambda generators no longer return a value.

3502 3503
- The re.sub(), re.subn() and re.split() functions now accept a flags parameter.

3504 3505 3506 3507 3508
- Issue #5108: Handle %s like %S, %R and %A in PyUnicode_FromFormatV(): Call
  PyUnicode_DecodeUTF8() once, remember the result and output it in a second
  step. This avoids problems with counting UTF-8 bytes that ignores the effect
  of using the replace error handler in PyUnicode_DecodeUTF8().

Barry Warsaw's avatar
Barry Warsaw committed
3509 3510
Library
-------
3511

3512 3513 3514
- Issue #7071: byte-compilation in Distutils is now done with respect to
  sys.dont_write_bytecode.

3515
- Issue #7066: archive_util.make_archive now restores the cwd if an error is
3516 3517
  raised. Initial patch by Ezio Melotti.

3518
- Issue #6516: Added owner/group support when creating tar archives in
3519 3520
  Distutils.

3521 3522
- Issue #6954: Fixed crash when using DISTUTILS_DEBUG flag in Distutils.

3523 3524 3525 3526
- Issue #6163: Fixed HP-UX runtime library dir options in
  distutils.unixcompiler. Initial patch by Sridhar Ratnakumar and
  Michael Haubenwallner.

3527 3528
- Issue #6693: New functions in site.py to get user/global site packages paths.

3529 3530 3531 3532
- Issue #6511: ZipFile now raises BadZipfile (instead of an IOError) when
  opening an empty or very small file.

- Issue #6545: Removed assert statements in distutils.Extension, so the
3533 3534
  behavior is similar when used with -O.

3535 3536
- unittest has been split up into a package.  All old names should still work.

3537 3538 3539 3540 3541
- Issue #6466: now distutils.cygwinccompiler and distutils.emxccompiler
  uses the same refactored function to get gcc/ld/dllwrap versions numbers.
  It's `distutils.util.get_compiler_versions`. Added deprecation warnings
  for the obsolete get_versions() functions.

3542 3543 3544 3545
- Issue #6433: fixed issues with multiprocessing.pool.map hanging on empty list

- Issue #6314: logging: Extra checks on the "level" argument in more places.

Florent Xicluna's avatar
Typo.  
Florent Xicluna committed
3546
- Issue #2622: Fixed an ImportError when importing email.message from a
3547 3548
  standalone application built with py2exe or py2app.

3549
- Issue #6455: Fixed test_build_ext under win32.
3550

3551
- Issue #6377: Enabled the compiler option, and deprecate its usage as an
3552 3553
  attribute.

3554 3555
- Issue #6413: Fixed the log level in distutils.dist for announce.

3556 3557
- Issue #6403: Fixed package path usage in build_ext.

3558 3559 3560 3561
- Issues #5155, 5313, 5331: multiprocessing.Process._bootstrap was
  unconditionally calling "os.close(sys.stdin.fileno())" resulting in file
  descriptor errors

3562
- Issue #6365: Distutils build_ext inplace mode was copying the compiled
3563 3564
  extension in a subdirectory if the extension name had dots.

3565
- Issue #6164: Added an AIX specific linker argument in Distutils
3566 3567
  unixcompiler. Original patch by Sridhar Ratnakumar.

3568 3569 3570
- Issue #6286: Now Distutils upload command is based on urllib2 instead of
  httplib, allowing the usage of http_proxy.

3571 3572
- Issue #6287: Added the license field in Distutils documentation.

3573 3574
- Issue #6263: Fixed syntax error in distutils.cygwincompiler.

3575 3576 3577 3578
- Issue #5201: distutils.sysconfig.parse_makefile() now understands `$$`
  in Makefiles. This prevents compile errors when using syntax like:
  `LDFLAGS='-rpath=\$$LIB:/some/other/path'`. Patch by Floris Bruynooghe.

3579 3580 3581
- Issue #6131: test_modulefinder leaked when run after test_distutils.
  Patch by Hirokazu Yamamoto.

3582 3583
- Issue #6048: Now Distutils uses the tarfile module in archive_util.

3584
- Issue #6062: In distutils, fixed the package option of build_ext. Feedback
3585 3586
  and tests on pywin32 by Tim Golden.

3587 3588
- Issue #6053: Fixed distutils tests on win32. patch by Hirokazu Yamamoto.

3589 3590 3591
- Issue #6046: Fixed the library extension when distutils build_ext is used
  inplace. Initial patch by Roumen Petrov.

3592
- Issue #6041: Now distutils `sdist` and `register` commands use `check` as a
3593 3594
  subcommand.

3595 3596 3597
- Issue #6022: a test file was created in the current working directory by
  test_get_outputs in Distutils.

3598 3599 3600
- Issue #5977: distutils build_ext.get_outputs was not taking into account the
  inplace option. Initial patch by kxroberto.

3601 3602 3603
- Issue #5984: distutils.command.build_ext.check_extensions_list checks were broken
  for old-style extensions.

3604 3605
- Issue #5976: Fixed Distutils test_check_environ.

3606 3607 3608 3609 3610
- Issue #5941: Distutils build_clib command was not working anymore because
  of an incomplete costumization of the archiver command. Added ARFLAGS in the
  Makefile besides AR and make Distutils use it. Original patch by David
  Cournapeau.

3611 3612
- Issue #2245: aifc now skips chunk types it doesn't recognize, per spec.

3613
- Issue #5874: distutils.tests.test_config_cmd is not locale-sensitive
3614 3615
  anymore.

3616
- Issue #5810: Fixed Distutils test_build_scripts so it uses
3617 3618
  sysconfig.get_config_vars.

3619 3620
- Issue #4951: Fixed failure in test_httpservers.

Thomas Heller's avatar
Thomas Heller committed
3621 3622
- Issue #5795: Fixed test_distutils failure on Debian ppc.

3623 3624
- Issue #5607: fixed Distutils test_get_platform for Mac OS X fat binaries.

3625 3626 3627
- Issue #5741: don't disallow "%%" (which is an escape for "%") when setting
  a value in SafeConfigParser.

3628 3629
- Issue #5732: added a new command in Distutils: check.

3630
- Issue #5731: Distutils bdist_wininst no longer worked on non-Windows
3631 3632
  platforms. Initial patch by Paul Moore.

3633 3634 3635
- Issue #5095: Added bdist_msi to the list of bdist supported formats.
  Initial fix by Steven Bethard.

3636 3637 3638
- Issue #1491431: Fixed distutils.filelist.glob_to_re for edge cases.
  Initial fix by Wayne Davison.

3639
- Issue #5694: removed spurious test output in Distutils (test_clean).
3640

3641
- Issue #1326077: fix the formatting of SyntaxErrors by the traceback module.
3642

3643 3644 3645 3646
- Issue #1665206 (partially): Move imports in cgitb to the top of the module
  instead of performing them in functions. Helps prevent import deadlocking in
  threads.

3647 3648 3649 3650
- Issue #2522: locale.format now checks its first argument to ensure it has
  been passed only one pattern, avoiding mysterious errors where it appeared
  that it was failing to do localization.

3651 3652 3653
- Issue #5583: Added optional Extensions in Distutils. Initial patch by Georg
  Brandl.

3654 3655 3656
- Issue #1222: locale.format() bug when the thousands separator is a space
  character.

3657 3658 3659
- Issue #5472: Fixed distutils.test_util tear down. Original patch by
  Tim Golden.

3660 3661
- collections.deque() objects now have a read-only attribute called maxlen.

3662 3663 3664 3665
- Issue #2638: Show a window constructed with tkSimpleDialog.Dialog only after
  it is has been populated and properly configured in order to prevent
  window flashing.

3666 3667 3668 3669 3670 3671
- Issue #4792: Prevent a segfault in _tkinter by using the
  guaranteed to be safe interp argument given to the PythonCmd in place of
  the Tcl interpreter taken from a PythonCmd_ClientData.

- Issue #5193: Guarantee that tkinter.Text.search returns a string.

3672 3673 3674
- Issue #5394: removed > 2.3 syntax from distutils.msvc9compiler.
  Original patch by Akira Kitada.

3675 3676
- Issue #5334: array.fromfile() failed to insert values when EOFError was raised.

3677 3678
- Issue #5385: Fixed mmap crash after resize failure on windows.

3679 3680
- Issue #5179: Fixed subprocess handle leak on failure on windows.

Raymond Hettinger's avatar
Raymond Hettinger committed
3681 3682
- PEP 372:  Added collections.OrderedDict().

3683 3684
- The _asdict() for method for namedtuples now returns an OrderedDict().

3685 3686
- configparser now defaults to using an ordered dictionary.

Benjamin Peterson's avatar
Benjamin Peterson committed
3687 3688 3689
- Issue #5401: Fixed a performance problem in mimetypes when ``from mimetypes
  import guess_extension`` was used.

3690 3691 3692
- Issue #1733986: Fixed mmap crash in accessing elements of second map object
  with same tagname but larger size than first map. (Windows)

3693 3694 3695
- Issue #5386: mmap.write_byte didn't check map size, so it could cause buffer
  overrun.

3696
- Issue #1533164: Installed but not listed ``*.pyo`` was breaking Distutils
3697 3698 3699 3700
  bdist_rpm command.

- Issue #5378: added --quiet option to Distutils bdist_rpm command.

3701 3702
- Issue #5052: make Distutils compatible with 2.3 again.

3703 3704
- Issue #5316: Fixed buildbot failures introduced by multiple inheritance
  in Distutils tests.
Barry Warsaw's avatar
Barry Warsaw committed
3705

3706 3707 3708
- Issue #5287: Add exception handling around findCaller() call to help out
  IronPython.

3709 3710 3711 3712 3713
- Issue #5282: Fixed mmap resize on 32bit windows and unix. When offset > 0,
  The file was resized to wrong size.

- Issue #5292: Fixed mmap crash on its boundary access m[len(m)].

3714
- Issue #2279: distutils.sdist.add_defaults now add files
3715 3716
  from the package_data and the data_files metadata.

3717
- Issue #5257: refactored all tests in distutils, so they use
3718 3719
  support.TempdirManager, to avoid writing in the tests directory.

3720 3721 3722
- Issue #4524: distutils build_script command failed with --with-suffix=3.
  Initial patch by Amaury Forgeot d'Arc.

3723 3724
- Issue #2461: added tests for distutils.util

3725 3726 3727 3728
- Issue #4998: The memory saving effect of __slots__ had been lost on Fractions
  which inherited from numbers.py which did not have __slots__ defined.  The
  numbers hierarchy now has its own __slots__ declarations.

3729 3730 3731
- Issue #4631: Fix urlopen() result when an HTTP response uses chunked
  encoding.

3732 3733 3734
- Issue #5203: Fixed ctypes segfaults when passing a unicode string to a
  function without argtypes (only occurs if HAVE_USABLE_WCHAR_T is false).

3735 3736 3737
- Issue #3386: distutils.sysconfig.get_python_lib prefix argument was ignored
  under NT and OS2. Patch by Philip Jenvey.

3738 3739 3740 3741
- Issue #5128: Make compileall properly inspect bytecode to determine if needs
  to be recreated. This avoids a timing hole thanks to the old reliance on the
  ctime of the files involved.

3742 3743 3744
- Issue #5122: Synchronize tk load failure check to prevent a potential
  deadlock.

3745 3746 3747 3748
- Issue #1818: collections.namedtuple() now supports a keyword argument
  'rename' which lets invalid fieldnames be automatically converted to
  positional names in the form, _1, _2, ...

3749 3750
- Issue #4890: Handle empty text search pattern in Tkinter.Text.search.

3751 3752 3753
- Issue #4512 (part 2): Promote ``ZipImporter._get_filename()`` to be a
  public documented method ``ZipImporter.get_filename()``.

3754 3755 3756 3757 3758
- Issue #4195: The ``runpy`` module (and the ``-m`` switch) now support
  the execution of packages by looking for and executing a ``__main__``
  submodule when a package name is supplied. Initial patch by Andi
  Vajda.

3759 3760 3761 3762 3763
- Issue #1731706: Call Tcl_ConditionFinalize for Tcl_Conditions that will
  not be used again (this requires Tcl/Tk 8.3.1), also fix a memory leak in
  Tkapp_Call when calling from a thread different than the one that created
  the Tcl interpreter. Patch by Robert Hancock.

3764 3765 3766
- Issue #4285: Change sys.version_info to be a named tuple. Patch by
  Ross Light.

3767
- Issue #1520877: Now distutils.sysconfig reads $AR from the
3768 3769
  environment/Makefile. Patch by Douglas Greiman.

3770 3771 3772
- Issue #1276768: The verbose option was not used in the code of
  distutils.file_util and distutils.dir_util.

3773
- Issue #5132: Fixed trouble building extensions under Solaris with
3774 3775
  --enabled-shared activated. Initial patch by Dave Peterson.

3776 3777
- Issue #1581476: Always use the Tcl global namespace when calling into Tcl.

3778 3779
- The shelve module now defaults to pickle protocol 3.

3780 3781 3782
- Fix a bug in the trace module where a bytes object from co_lnotab had its
  items being passed through ord().

3783 3784 3785 3786
- Issue #2047: shutil.move() could believe that its destination path was
  inside its source path if it began with the same letters (e.g. "src" vs.
  "src.new").

3787 3788
- Added the ttk module. See issue #2983: Ttk support for Tkinter.

3789 3790 3791 3792
- Removed isSequenceType(), isMappingType, and isNumberType() from the
  operator module; use the abstract base classes instead.  Also removed
  the repeat() function; use mul() instead.

3793
- Issue #5021:  doctest.testfile() did not create __name__ and
3794 3795 3796 3797 3798
  collections.namedtuple() relied on __name__ being defined.

- Backport importlib from Python 3.1. Only the import_module() function has
  been backported to help facilitate transitions from 2.7 to 3.1.

3799 3800 3801
- Issue #1885: distutils. When running sdist with --formats=tar,gztar
  the tar file was overriden by the gztar one.

3802 3803
- Issue #4863: distutils.mwerkscompiler has been removed.

3804 3805
- Added a new itertools functions:  combinations_with_replacement()
  and compress().
3806

3807
- Issue #5032:  added a step argument to itertools.count() and
3808 3809
  allowed non-integer arguments.

Jesse Noller's avatar
Jesse Noller committed
3810 3811 3812 3813
- Fix and properly document the multiprocessing module's logging
  support, expose the internal levels and provide proper usage
  examples.

3814 3815 3816
- Issue #1672332: fix unpickling of subnormal floats, which was
  producing a ValueError on some platforms.

3817 3818 3819
- Issue #3881: Help Tcl to load even when started through the
  unreadable local symlink to "Program Files" on Vista.

3820 3821 3822
- Issue #4710: Extract directories properly in the zipfile module;
  allow adding directories to a zipfile.

3823
- Issue #3807: _multiprocessing build fails when configure is passed
Jesse Noller's avatar
Jesse Noller committed
3824 3825 3826
  --without-threads argument. When this occurs, _multiprocessing will
  be disabled, and not compiled.

3827 3828 3829 3830 3831
- Issue #5008: When a file is opened in append mode with the new IO library,
  do an explicit seek to the end of file (so that e.g. tell() returns the
  file size rather than 0). This is consistent with the behaviour of the
  traditional 2.x file object.

3832 3833 3834
- Issue #5013: Fixed a bug in FileHandler which occurred when the delay
  parameter was set.

3835 3836 3837
- Issue #4842: Always append a trailing 'L' when pickling longs using
  pickle protocol 0.  When reading, the 'L' is optional.

3838 3839
- Add the importlib package.

Jesse Noller's avatar
Jesse Noller committed
3840 3841 3842
- Issue #4301: Patch the logging module to add processName support, remove
  _check_logger_class from multiprocessing.

3843
- Issue #3325: Remove python2.x try: except: imports for old cPickle from
3844
  multiprocessing.
3845

3846 3847 3848
- Issue #4959: inspect.formatargspec now works for keyword only arguments
  without defaults.

3849 3850
- Issue #3321: ``_multiprocessing.Connection()`` doesn't check handle; added checks
  for Unix machines for negative handles and large int handles. Without this check
Jesse Noller's avatar
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3851 3852
  it is possible to segfault the interpreter.

3853 3854 3855 3856 3857 3858
- Issue #4449: AssertionError in mp_benchmarks.py, caused by an underlying issue
  in sharedctypes.py.

- Issue #1225107: inspect.isclass() returned True for instances with a custom
  __getattr__.

3859 3860 3861 3862
- Issue #3826 and #4791: The socket module now closes the underlying socket
  appropriately when it is being used via socket.makefile() objects
  rather than delaying the close by waiting for garbage collection to do it.

3863 3864 3865
- Issue #1696199:  Add collections.Counter() for rapid and convenient
  counting.

3866 3867
- Issue #3860: GzipFile and BZ2File now support the context manager protocol.

3868 3869 3870
- Issue #4867: Fixed a crash in ctypes when passing a string to a
  function without defining argtypes.

3871 3872 3873 3874 3875
- Issue #4272: Add an optional argument to the GzipFile constructor to override
  the timestamp in the gzip stream. The default value remains the current time.
  The information can be used by e.g. gunzip when decompressing. Patch by
  Jacques Frechet.

3876 3877
- Restore Python 2.3 compatibility for decimal.py.

3878 3879 3880
- Issue #3638: Remove functions from _tkinter module level that depend on
  TkappObject to work with multiple threads.

3881 3882
- Issue #4718: Adapt the wsgiref package so that it actually works with
  Python 3.x, in accordance with the `official amendments of the spec
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  <http://www.wsgi.org/wsgi/Amendments_1.0>`_.

3885 3886 3887
- Issue #4796: Added Decimal.from_float() and Context.create_decimal_from_float()
  to the decimal module.

3888 3889 3890
- Fractions.from_float() no longer loses precision for integers too big to
  cast as floats.

3891 3892 3893
- Issue #4812: add missing underscore prefix to some internal-use-only
  constants in the decimal module.  (Dec_0 becomes _Dec_0, etc.)

3894
- Issue #4790: The nsmallest() and nlargest() functions in the heapq module
3895 3896
  did unnecessary work in the common case where no key function was specified.

3897 3898 3899
- Issue #4795: inspect.isgeneratorfunction() returns False instead of None when
  the function is not a generator.

3900 3901
- Issue #4702: Throwing a DistutilsPlatformError instead of IOError in case
  no MSVC compiler is found under Windows. Original patch by Philip Jenvey.
3902

3903
- Issue #4646: distutils was choking on empty options arg in the setup
3904 3905
  function. Original patch by Thomas Heller.

3906 3907
- Issue #3767: Convert Tk object to string in tkColorChooser.

3908 3909
- Issue #3248: Allow placing ScrolledText in a PanedWindow.

3910 3911 3912
- Issue #4444: Allow assertRaises() to be used as a context handler, so that
  the code under test can be written inline if more practical.

3913 3914 3915
- Issue #4739: Add pydoc help topics for symbols, so that e.g. help('@')
  works as expected in the interactive environment.

3916 3917 3918
- Issue #4756: zipfile.is_zipfile() now supports file-like objects. Patch by
  Gabriel Genellina.

3919 3920 3921
- Issue #4574: reading an UTF16-encoded text file crashes if \r on 64-char
  boundary.

3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940
- Issue #4223: inspect.getsource() will now correctly display source code
  for packages loaded via zipimport (or any other conformant PEP 302
  loader). Original patch by Alexander Belopolsky.

- Issue #4201: pdb can now access and display source code loaded via
  zipimport (or any other conformant PEP 302 loader). Original patch by
  Alexander Belopolsky.

- Issue #4197: doctests in modules loaded via zipimport (or any other PEP
  302 conformant loader) will now work correctly in most cases (they
  are still subject to the constraints that exist for all code running
  from inside a module loaded via a PEP 302 loader and attempting to
  perform IO operations based on __file__). Original patch by
  Alexander Belopolsky.

- Issues #4082 and #4512: Add runpy support to zipimport in a manner that
  allows backporting to maintenance branches. Original patch by
  Alexander Belopolsky.

3941 3942 3943
- Issue #4163: textwrap module: allow word splitting on a hyphen preceded by
  a non-ASCII letter.

3944 3945
- Issue #4616: TarFile.utime(): Restore directory times on Windows.

3946 3947 3948
- Issue #4021: tokenize.detect_encoding() now raises a SyntaxError when the
  codec cannot be found.  This is for compatibility with the builtin behavior.

3949 3950 3951 3952
- Issue #4084: Fix max, min, max_mag and min_mag Decimal methods to
  give correct results in the case where one argument is a quiet NaN
  and the other is a finite number that requires rounding.

3953 3954 3955
- Issue #4483: _dbm module now builds on systems with gdbm & gdbm_compat
  libs.

3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971
- Added the subprocess.check_call_output() convenience function to get output
  from a subprocess on success or raise an exception on error.

- Issue #1055234: cgi.parse_header(): Fixed parsing of header parameters to
  support unusual filenames (such as those containing semi-colons) in
  Content-Disposition headers.

- Issue #4384: Added logging integration with warnings module using
  captureWarnings(). This change includes a NullHandler which does nothing;
  it will be of use to library developers who want to avoid the "No handlers
  could be found for logger XXX" message which can appear if the library user
  doesn't configure logging.

- Issue #3741: DISTUTILS_USE_SDK set causes msvc9compiler.py to raise an
  exception.

3972 3973 3974 3975 3976 3977 3978 3979 3980
- Issue #4529: fix the parser module's validation of try-except-finally
  statements.

- Issue #4458: getopt.gnu_getopt() now recognizes a single "-" as an argument,
  not a malformed option.

- Added the subprocess.check_output() convenience function to get output
  from a subprocess on success or raise an exception on error.

3981 3982 3983
- Issue #4542: On Windows, binascii.crc32 still accepted str as binary input;
  the corresponding tests now pass.

3984 3985 3986
- Issue #4537: webbrowser.UnixBrowser would fail to open the browser because
  it was calling the wrong open() function.

3987 3988 3989 3990
- Issue #1055234: cgi.parse_header(): Fixed parsing of header parameters to
  support unusual filenames (such as those containing semi-colons) in
  Content-Disposition headers.

3991 3992 3993
- Issue #4861: ctypes.util.find_library(): Robustify. Fix library detection on
  biarch systems. Try to rely on ldconfig only, without using objdump and gcc.

Benjamin Peterson's avatar
Benjamin Peterson committed
3994 3995 3996 3997
- Issue #5104: The socket module now raises OverflowError when 16-bit port and
  protocol numbers are supplied outside the allowed 0-65536 range on bind()
  and getservbyport().

3998 3999
- Windows locale mapping updated to Vista.

4000 4001 4002
Tools/Demos
-----------

4003 4004 4005
- Issue #4704: remove use of cmp() in pybench, bump its version number to 2.1,
  and make it 2.6-compatible.

4006 4007
- Ttk demos added in Demo/tkinter/ttk/

4008 4009
- Issue #4677: add two list comprehension tests to pybench.

4010 4011 4012 4013

Build
-----

4014 4015
- Issue #6094: Build correctly with Subversion 1.7.

4016 4017
- Issue #5847: Remove -n switch on "Edit with IDLE" menu item.

4018 4019 4020
- Issue #5726: Make Modules/ld_so_aix return the actual exit code of the
  linker, rather than always exit successfully. Patch by Floris Bruynooghe.

4021
- Issue #4587: Add configure option --with-dbmliborder=db1:db2:... to specify
4022
  the order that backends for the dbm extension are checked.
4023

4024 4025
- Link the shared python library with $(MODLIBS).

4026 4027
- Issue #5134: Silence compiler warnings when compiling sqlite with VC++.

4028 4029
- Issue #4494: Fix build with Py_NO_ENABLE_SHARED on Windows.

4030 4031
- Issue #4895: Use _strdup on Windows CE.

4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055
- Issue #4472: "configure --enable-shared" now works on OSX

- Issues #4728 and #4060: WORDS_BIGEDIAN is now correct in Universal builds.

- Issue #4389: Add icon to the uninstall entry in "add-and-remove-programs".

- Issue #4289: Remove Cancel button from AdvancedDlg.

- Issue #1656675: Register a drop handler for .py* files on Windows.

- Issue #4120: Exclude manifest from extension modules in VS2008.

- Issue #4091: Install pythonxy.dll in system32 again.

- Issue #4018: Disable "for me" installations on Vista.

- Issue #3758: Add ``patchcheck`` build target to .PHONY.

- Issue #4204: Fixed module build errors on FreeBSD 4.


C-API
-----

4056 4057 4058
- Issue #6624: yArg_ParseTuple with "s" format when parsing argument with
  NUL: Bogus TypeError detail string.

4059 4060 4061
- Issue #5175: PyLong_AsUnsignedLongLong now raises OverflowError
  for negative arguments.  Previously, it raised TypeError.

4062 4063 4064 4065 4066 4067 4068 4069 4070
- Issue #4720: The format for PyArg_ParseTupleAndKeywords can begin with '|'.

- Issue #3632: from the gdb debugger, the 'pyo' macro can now be called when
  the GIL is released, or owned by another thread.

- Issue #4122: On Windows, fix a compilation error when using the
  Py_UNICODE_ISSPACE macro in an extension module.


4071 4072 4073
Extension Modules
-----------------

4074 4075 4076 4077
- Issue #3745: Fix hashlib to always reject unicode and non buffer-api
  supporting objects as input no matter how it was compiled (built in
  implementations or external openssl library).

4078 4079
- Issue #4397: Fix occasional test_socket failure on OS X.

4080 4081
- Issue #4279: Fix build of parsermodule under Cygwin.

4082 4083 4084 4085
- Issue #4751: hashlib now releases the GIL when hashing large buffers
  (with a hardwired threshold of 2048 bytes), allowing better parallelization
  on multi-CPU systems. Contributed by Lukas Lueg (ebfe) and Victor Stinner.

4086 4087
- Issue #4051: Prevent conflict of UNICODE macros in cPickle.

4088 4089 4090 4091
- Issue #4738: Each zlib object now has a separate lock, allowing to compress
  or decompress several streams at once on multi-CPU systems. Also, the GIL
  is now released when computing the CRC of a large buffer. Patch by ebfe.

4092 4093
- Issue #4228: Pack negative values the same way as 2.4 in struct's L format.

4094 4095
- Issue #1040026: Fix os.times result on systems where HZ is incorrect.

4096 4097
- Issues #3167, #3682: Fix test_math failures for log, log10 on Solaris,
  OpenBSD.
4098

4099 4100 4101 4102
- Issue #4583: array.array would not always prohibit resizing when a buffer
  has been exported, resulting in an interpreter crash when accessing the
  buffer.

4103

4104 4105
- Issue #5228: Make functools.partial objects can now be pickled.

4106 4107 4108
Tests
-----

4109 4110 4111
- Issue #6152: New option '-j'/'--multiprocess' for regrtest allows running
  regression tests in parallel, shortening the total runtime.

4112 4113 4114 4115 4116
- Issue #5450: Moved tests involving loading tk from Lib/test/test_tcl to
  Lib/tkinter/test/test_tkinter/test_loadtk. With this, these tests demonstrate
  the same behaviour as test_ttkguionly (and now also test_tk) which is to
  skip the tests if DISPLAY is defined but can't be used.

4117
- regrtest no longer treats ImportError as equivalent to SkipTest.  Imports
4118
  that should cause a test to be skipped are now done using import_module
4119 4120
  from test support, which does the conversion.

4121 4122 4123
- Issue #5083: New 'gui' resource for regrtest.


4124 4125 4126
Docs
----

4127

4128
**(For information about older versions, consult the HISTORY file.)**