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

*Release date: XX-XXX-XXX*

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

15 16 17
- Issue #8014: Setting a T_UINT or T_PYSSIZET attribute of an object with
  PyMemberDefs could produce an internal error;  raise TypeError instead.

18 19 20 21 22
- 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.

23 24 25 26 27
- 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
  printed and Python exits. Initialize the GIL before importing the site
  module.

28 29
- Issue #7173: Generator finalization could invalidate sys.exc_info().

30 31 32
- Issue #7544: Preallocate thread memory before creating the thread to avoid
  a fatal error in low memory condition.

33 34 35
- Issue #7820: The parser tokenizer restores all bytes in the right if
  the BOM check fails.

36 37
- Handle errors from looking up __prepare__ correctly.

38 39 40
- Issue #5939: Add additional runtime checking to ensure a valid capsule
  in Modules/_ctypes/callproc.c.

41 42 43 44
- Issue #7309: Fix unchecked attribute access when converting
  UnicodeEncodeError, UnicodeDecodeError, and UnicodeTranslateError to
  strings.

45 46 47
- Issue #6902: Fix problem with built-in types format incorrectly with
  0 padding.

48 49 50
- Issue #7988: Fix default alignment to be right aligned for
  complex.__format__. Now it matches other numeric types.

51 52 53 54 55
- Issue #5988: Remove deprecated functions PyOS_ascii_formatd,
  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.

56 57 58
- Issue #7385: Fix a crash in `MemoryView_FromObject` when
  `PyObject_GetBuffer` fails.  Patch by Florent Xicluna.

59 60 61
- Issue #7788: Fix an interpreter crash produced by deleting a list
  slice with very large step value.

62 63 64 65 66
- 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.

67 68 69 70 71
- 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}`,
  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.

80 81 82 83
- 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.

84 85 86 87
- 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
88 89 90
  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.
91

92 93 94
- 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.

98 99 100
- Issue #7604: Deleting an unset slotted attribute did not raise an
  AttributeError.

101 102 103 104
- 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.

  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.

123 124 125
- Issue #6077: On Windows, files opened with tempfile.TemporaryFile in "wt+"
  mode would appear truncated on the first '0x1a' byte (aka. Ctrl+Z).

126 127 128
- 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.

131 132 133
- 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.

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

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

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

148 149
- Issue #1087418: Boost performance of bitwise operations for longs.

150 151 152 153 154 155 156
- 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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- Peephole constant folding had missed UNARY_POSITIVE.

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- 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.

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

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

169 170 171 172
- 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.

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- Issue #7065: Fix a crash in bytes.maketrans and bytearray.maketrans when
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  using byte values greater than 127.  Patch by Derk Drukker.
175

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- 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.

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

184 185 186
- Issue #6990: Fix threading.local subclasses leaving old state around
  after a reference cycle GC which could be recycled by new locals.

187 188
- Issue #5460: Fix an ambiguity in the grammar.

189 190
- Issue #1766304: Improve performance of membership tests on range objects.

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

193 194
- Issue #6846: Fix bug where bytearray.pop() returns negative integers.

195 196 197
- Issue #6750: A text file opened with io.open() could duplicate its output
  when writing from multiple threads at the same time.

198 199
- Issue #6707: dir() on an uninitialized module caused a crash.

200 201
- Issue #6540: Fixed crash for bytearray.translate() with invalid parameters.

202 203 204
- Issue #6573: set.union() stopped processing inputs if an instance of self
  occurred in the argument chain.

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

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

210 211 212 213
- 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.

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- The deprecated PyCObject has been removed.

216 217 218 219
- 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.

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

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- Issue #4856: Remove checks for win NT.

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

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

232 233 234 235
- 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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C-API
-----

239 240 241
- Issue #7767: New function PyLong_AsLongLongAndOverflow added,
  analogous to PyLong_AsLongAndOverflow.

242 243 244
- Make PyUnicode_CompareWithASCIIString return not equal if the Python string
  has '\0' at the end.

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- Issue #5080: The argument parsing functions PyArg_ParseTuple,
  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,
  to match the behaviour of the other integer format codes.

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- Issue #7033: function ``PyErr_NewExceptionWithDoc()`` added.

254 255 256
- Issue #7414: 'C' code wasn't being skipped properly (for keyword arguments)
  in PyArg_ParseTupleAndKeywords.

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

260 261 262 263 264 265
- 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.

- Issue #6405: Remove duplicate type declarations in descrobject.h.
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- The code flags for old __future__ features are now available again.

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- 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.

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- 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.

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Library
-------
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- 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.

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- 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).

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

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

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

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

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

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- Issue #1054943: Fix ``unicodedata.normalize('NFC', text)`` for the Public
  Review Issue #29 (http://unicode.org/review/pr-29.html).
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- Issue #7494: fix a crash in _lsprof (cProfile) after clearing the profiler,
  reset also the pointer to the current pointer context.

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

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

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

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

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- Issue #7869: logging: improved diagnostic for format-time errors.

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

- logging: Implemented PEP 391.

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- Issue #1537721: Add a writeheader() method to csv.DictWriter.
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- Issue #7959: ctypes callback functions are now registered correctly
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  with the cycle garbage collector.
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- Issue #5801: removed spurious empty lines in wsgiref.

340 341 342
- 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.

343 344 345
- Issue #7597: curses.use_env() can now be called before initscr().
  Noted by Kan-Ru Chen.

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

348 349 350
- Issue #7970: email.Generator.flatten now correctly flattens message/rfc822
  messages parsed by email.Parser.HeaderParser.

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

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- 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.

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

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- 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.

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- 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.

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

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

380 381 382 383 384
- 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
  ftruncate() and other truncation APIs.  Patch by Pascal Chambon.

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- Issue #7610: Reworked implementation of the internal
  :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.

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- Issue #6963: Added "maxtasksperchild" argument to multiprocessing.Pool,
  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.

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

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- Issue #7785: Don't accept bytes in FileIO.write().
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- Removed the functions 'verify' and 'vereq' from Lib/test/support.py.

403 404 405
- Issue #7773: Fix an UnboundLocalError in platform.linux_distribution() when
  the release file is empty.

406 407 408
- Issue #7561: Fix crashes when using bytearray objects with the posix
  module.

409 410 411 412
- 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.

413 414 415
- Issue #7703: Add support for the new buffer API to `binascii.a2bhqx`.
  Patch by Florent Xicluna, along with some additional tests.

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

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

422 423 424
- Issue #2846: Add support for gzip.GzipFile reading zero-padded files.
  Patch by Brian Curtin.

425 426
- Issue #7681: Use floor division in appropiate places in the wave module.

427 428 429 430
- 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.

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

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

438 439 440
- Issue #7455: Fix possible crash in cPickle on invalid input.  Patch by
  Victor Stinner.

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

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- 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.

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

- socket.create_connection now accepts an optional source_address parameter.

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

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- 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.

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- 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.

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

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- 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.

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- 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.

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

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

482 483
- Add a reverse() method to collections.deque().

484 485
- Fix variations of extending deques:  d.extend(d)  d.extendleft(d)  d+=d

486 487 488
- Issue #6986: Fix crash in the JSON C accelerator when called with the
  wrong parameter types.  Patch by Victor Stinner.

489 490 491
- Issue #7457: added a read_pkg_file method to 
  distutils.dist.DistributionMetadata.

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

495 496 497
- Issue #1923: Fixed the removal of meaningful spaces when PKG-INFO is 
  generated in Distutils. Patch by Stephen Emslie.

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

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

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- 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.

509 510 511 512
- Issue #4486: When an exception has an explicit cause, do not print its
  implicit context too.  This affects the `traceback` module as well as
  built-in exception printing.

513 514 515
- Issue #1515: Enable use of deepcopy() with instance methods.  Patch by
  Robert Collins.

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

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- 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.

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

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

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

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

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

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- Issue #5037: Proxy the __bytes__ special method instead to __bytes__ instead
  of __str__.
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- Issue #7341: Close the internal file object in the TarFile constructor in
  case of an error.

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

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

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

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

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- 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
  support the same flexibility as the CPython command line itself.

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- 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.

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

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

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- Issue #3001: Add a C implementation of recursive locks which is used by
  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).

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

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

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

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

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- 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.

597 598 599 600 601 602
- 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.

603 604 605 606 607
- 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.

608 609 610
- Issue #4750: Store the basename of the original filename in the gzip FNAME
  header as required by RFC 1952.

611 612 613
- Issue #1180: Added a new global option to ignore ~/.pydistutils.cfg in
  Distutils.

614 615 616
- Issue #7218: Fix test_site for win32, the directory comparison was done with
  an uppercase.

617 618 619
- Issue #7205: Fix a possible deadlock when using a BZ2File object from
  several threads at once.

620 621
- Issue #7077: logging: SysLogHandler now treats Unicode as per RFC 5424.

622 623 624
- Issue #7099: Decimal.is_normal now returns True for numbers with exponent
  larger than emax.

625 626 627
- Issue #7080: locale.strxfrm() raises a MemoryError on 64-bit non-Windows
  platforms, and assorted locale fixes by Derk Drukker.

628 629 630
- Issue #5833: Fix extra space character in readline completion with the
  GNU readline library version 6.0.

631
- Issue #6894: Fixed the issue urllib2 doesn't respect "no_proxy" environment
632

633 634
- Issue #7086: Added TCP support to SysLogHandler, and tidied up some
  anachronisms in the code which were a relic of 1.5.2 compatibility.
635

636 637 638
- Issue #7082: When falling back to the MIME 'name' parameter, the
  correct place to look for it is the Content-Type header.

639 640 641
- Make tokenize.detect_coding() normalize utf-8 and iso-8859-1 variants like the
  builtin tokenizer.

642 643 644
- Issue #7048: Force Decimal.logb to round its result when that result
  is too large to fit in the current precision.

645
- Issue #6236, #6348: Fix various failures in the I/O library under AIX
646
  and other platforms, when using a non-gcc compiler. Patch by Derk Drukker.
647

648 649 650
- Issue #4606: Passing 'None' if ctypes argtype is set to POINTER(...)
  does now always result in NULL.

651 652 653
- Issue #5042: Structure sub-subclass does now initialize correctly
  with base class positional arguments.

654 655
- Issue #6882: Import uuid creates zombies processes.

656 657
- Issue #6635: Fix profiler printing usage message.

658 659
- Issue #6856: Add a filter keyword argument to TarFile.add().

660 661
- Issue #6888: pdb's alias command was broken when no arguments were given.

662 663 664
- Issue #6857: Default format() alignment should be '>' for Decimal
  instances.

665 666 667 668
- Issue #6795: int(Decimal('nan')) now raises ValueError instead of
  returning NaN or raising InvalidContext.  Also, fix infinite recursion
  in long(Decimal('nan')).

669 670 671
- Issue #6850: Fix bug in Decimal._parse_format_specifier for formats
  with no type specifier.

672 673
- Issue #6239: ctypes.c_char_p return value must return bytes.

674 675 676 677 678
- 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'.

679 680 681
- Trying to import a submodule from a module that is not a package, ImportError
  should be raised, not AttributeError.

682 683 684
- When the globals past to importlib.__import__() has __package__ set to None,
  fall back to computing what __package__ should be instead of giving up.

685 686 687 688
- Raise a TypeError when the name of a module to be imported for
  importlib.__import__ is not a string (was raising an
  AttributeError before).

689 690
- Allow the fromlist passed into importlib.__import__ to be any iterable.

691 692
- Have importlib raise ImportError if None is found in sys.modules.

693 694
- Issue #6054: Do not normalize stored pathnames in tarfile.

695 696 697
- Issue #6794: Fix Decimal.compare_total and Decimal.compare_total_mag: NaN
  payloads are now ordered by integer value rather than lexicographically.

698 699 700 701 702 703 704 705 706
- 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.

707 708
- Issue #6665: Fix fnmatch to properly match filenames with newlines in them.

709 710 711
- Issue #1135: Add the XView and YView mix-ins to avoid duplicating
  the xview* and yview* methods.

712 713 714 715 716
- 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.

717 718 719
- Issue #6622: Fix "local variable 'secret' referenced before
  assignment" bug in POP3.apop.

720 721
- Issue #2715: Remove remnants of Carbon.File from binhex module.

722 723 724 725
- 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].

726 727 728
- Issue #6106: telnetlib.Telnet.process_rawq doesn't handle default WILL/WONT
  DO/DONT correctly.

729 730 731
- Issue #1424152: Fix for http.client, urllib.request to support SSL while
  working through proxy. Original patch by Christopher Li, changes made by
  Senthil Kumaran
732

733 734 735 736 737
- Add importlib.abc.ExecutionLoader to represent the PEP 302 protocol for
  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.

738 739 740 741
- 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.

742 743 744 745
- 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.

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Antoine Pitrou committed
746
- Issue #6415: Fixed warnings.warn segfault on bad formatted string.
747

748 749 750
- Issue #6358: The exit status of a command started with os.popen() was
  reported differently than it did with python 2.x.

751 752 753
- Issue #6323: The pdb debugger did not exit when running a script with a
  syntax error.

754 755 756
- Issue #3392: The subprocess communicate() method no longer fails in select()
  when file descriptors are large; communicate() now uses poll() when possible.

757 758
- Issue #6369: Fix an RLE decompression bug in the binhex module.

759 760
- Issue #6344: Fixed a crash of mmap.read() when passed a negative argument.

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761 762
- The deprecated function string.maketrans has been removed.

763 764 765
- Issue #4005: Fixed a crash of pydoc when there was a zip file present in
  sys.path.

766 767
- Issue #6218: io.StringIO and io.BytesIO instances are now picklable.

768 769 770
- 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.

771 772 773
- Issue #7481: When a threading.Thread failed to start it would leave the
  instance stuck in initial state and present in threading.enumerate().

774 775 776
- Issue #1068268: The subprocess module now handles EINTR in internal
  os.waitpid and os.read system calls where appropriate.

777 778
- Issue #6729: Added ctypes.c_ssize_t to represent ssize_t.

779 780
- Issue #6247: The argparse module has been added to the standard library.

781 782
Extension Modules
-----------------
783

784 785 786
- Issue #6544: fix a reference leak in the kqueue implementation's error
  handling.

787 788 789
- Stop providing crtassem.h symbols when compiling with Visual Studio 2010, as
  msvcr100.dll is not a platform assembly anymore.

790 791
- Issue #6508: Add posix.{getresuid,getresgid,setresuid,setresgid}.

792 793
- Issue #7078: Set struct.__doc__ from _struct.__doc__.

794
- Issue #3366: Add erf, erfc, expm1, gamma, lgamma functions to math module.
795

796 797
- Issue #6877: It is now possible to link the readline extension to the
  libedit readline emulation on OSX 10.5 or later.
798

799 800
- Issue #6848: Fix curses module build failure on OS X 10.6.

801 802
- Fix a segfault that could be triggered by expat with specially formed input.

803 804 805 806
- 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'.

807
- Issue #4509: Array objects are no longer modified after an operation
808 809 810
  failing due to the resize restriction in-place when the object has exported
  buffers.

811 812
- Issue #2389: Array objects are now pickled in a portable manner.

813 814 815
- Expat: Fix DoS via XML document with malformed UTF-8 sequences
  (CVE_2009_3560).

816 817 818 819
- 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.

820 821 822
- Issue #7999: os.setreuid() and os.setregid() would refuse to accept a -1
  parameter on some platforms such as OS X.

823 824 825
Build
-----

826
- Issue #3920, #7903: Define _BSD_SOURCE on OpenBSD 4.4 through 4.9.
827

828 829 830 831
- 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.

832 833 834 835 836
- 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.

837 838 839 840
- 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.

841 842 843
- Issue #7589: Only build the nis module when the correct header files are
  found.

844
- Switch to OpenSSL 0.9.8l and sqlite 3.6.21 on Windows.
845

846 847 848
- Issue #5792: Extend the short float repr support to x86 systems using
  icc or suncc.

849 850 851 852
- 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.

853 854
- Issue #6802: Fix build issues on MacOSX 10.6

855 856
- Issue #6244: Allow detect_tkinter to look for Tcl/Tk 8.6.

857 858 859
- Issue 4601: 'make install' did not set the appropriate permissions on
  directories.

860 861 862
- Issue 5390: Add uninstall icon independent of whether file
  extensions are installed.

863 864 865
- Issue #7541: when using ``python-config`` with a framework install the compiler might
  use the wrong library.

866
Documentation
867 868
------------

869 870 871
- A small wsgi server was added as Tools/scripts/serve.py, and is used to
  implement a local documentation server via 'make serve' in the doc directory.

872 873 874
- Updating `Using Python` documentation to include description of CPython's
  -J and -X options.

875 876 877
- Document that importing a module that has None in sys.modules triggers an
  ImportError.

878 879
- Issue #6556: Fixed the Distutils configuration files location explanation
  for Windows.
880 881 882
 
- Update python manual page (options -B, -O0, -s, environment variables
  PYTHONDONTWRITEBYTECODE, PYTHONNOUSERSITE).
883

884 885 886
Tests
-----

887 888 889
- Issue #7849: Now the utility ``check_warnings`` verifies if the warnings are
  effectively raised.

890 891 892
- The four path modules (genericpath, macpath, ntpath, posixpath) share a
  common TestCase for some tests: test_genericpath.CommonTest.

893 894 895
- Print platform information when running the whole test suite, or using
  the --verbose flag.

896 897 898
- Issue #767675: enable test_pep277 on POSIX platforms with Unicode-friendly
  filesystem encoding.

899 900 901
- 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.

902 903 904 905 906
- 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.

907 908 909 910
- 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.

911 912 913
- issue #7728: test_timeout was changed to use test_support.bind_port
  instead of a hard coded port.

914 915 916
- Issue #7376: instead of running a self-test (which was failing) when called
  with no arguments, doctest.py now gives a usage message.

917 918
- Issue #7396: fix regrtest -s, which was broken by the -j enhancement.

919
- Issue #7498: test_multiprocessing now uses test.support.find_unused_port
920 921
  instead of a hardcoded port number in test_rapid_restart.

922 923 924 925
- 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.

926 927 928
- Issue #7324: add a sanity check to regrtest argument parsing to
  catch the case of an option with no handler.

929 930 931
- Issue #7312: Add a -F flag to run the selected tests in a loop until
  a test fails.  Can be combined with -j.

932 933 934 935 936
- 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.

937 938
- Issue #7295: Do not use a hardcoded file name in test_tarfile.

939 940 941
- Issue #7270: Add some dedicated unit tests for multi-thread synchronization
  primitives such as Lock, RLock, Condition, Event and Semaphore.

942 943 944 945
- 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.

946 947 948 949
- 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.

950 951 952 953 954 955
- Issue #7222: Make thread "reaping" more reliable so that reference
  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:
  :func:`_thread._count()`.

956 957 958
- 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.

959 960 961
- Issue #7055: test___all__ now greedily detects all modules which have an
  __all__ attribute, rather than using a hardcoded and incomplete list.

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962 963 964
- Issue #7058: Added save/restore for things like sys.argv and cwd to
  runtest_inner in regrtest, with warnings if the called test modifies them,
  and a new section in the summary report at the end.
965

966 967
- Issue #7042: Fix test_signal (test_itimer_virtual) failure on OS X 10.6.

968 969 970 971
- 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.

972 973 974
- Removed importlib's custom test discovery code and switched to
    unittest.TestLoader.discover().

975 976 977 978 979 980 981
Tools/Demos
-----------

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

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983 984 985 986 987 988 989 990
What's New in Python 3.1?
=========================

*Release date: 27-June-2009*

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

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Mark Dickinson committed
991 992 993
- Issue #6334: Fix bug in range length calculation for ranges with
  large arguments.

994 995 996
- Issue #6329: Fixed iteration for memoryview objects (it was being blocked
  because it wasn't recognized as a sequence).

997 998 999
Library
-------

1000 1001
- Issue #6126: Fixed pdb command-line usage.

1002
- Issue #6314: logging: performs extra checks on the "level" argument.
1003

1004 1005
- Issue #6274: Fixed possible file descriptors leak in subprocess.py

1006 1007 1008
- Accessing io.StringIO.buffer now raises an AttributeError instead of
  io.UnsupportedOperation.

1009
- Issue #6271: mmap tried to close invalid file handle (-1) when anonymous.
1010 1011
  (On Unix)

1012 1013 1014
- Issue #1202: zipfile module would cause a struct.error when attempting to
  store files with a CRC32 > 2**31-1.

1015 1016 1017 1018 1019
Extension Modules
-----------------

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

1020

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1021 1022
What's New in Python 3.1 Release Candidate 2?
=============================================
Benjamin Peterson's avatar
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1023

Benjamin Peterson's avatar
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1024
*Release date: 13-June-2009*
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1025 1026 1027 1028

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

1029 1030
- Fixed SystemError triggered by "range([], 1, -1)".

1031 1032 1033
- Issue #5924: On Windows, a large PYTHONPATH environment variable
  (more than 255 characters) would be completely ignored.

1034 1035 1036
- Issue #4547: When debugging a very large function, it was not always
  possible to update the lineno attribute of the current frame.

1037
- Issue #5330: C functions called with keyword arguments were not reported by
1038
  the various profiling modules (profile, cProfile). Patch by Hagen Fürstenau.
1039

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1040 1041 1042
Library
-------

1043
- Issue #6438: Fixed distutils.cygwinccompiler.get_versions : the regular
1044
  expression string pattern was trying to match against a bytes returned by
1045 1046
  Popen. Tested under win32 to build the py-postgresql project.

1047 1048
- Issue #6258: Support AMD64 in bdist_msi.

1049 1050 1051
- Issue #6195: fixed doctest to no longer try to read 'source' data from
  binary files.

1052 1053 1054
- Issue #5262: Fixed bug in next rollover time computation in
  TimedRotatingFileHandler.

1055 1056 1057 1058
- 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.

1059 1060 1061 1062 1063
- 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.

1064 1065
- Removed the ipaddr module.

1066 1067 1068 1069
- 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.

1070 1071
- Issue #5767: Remove sgmlop support from xmlrpc.client.

1072 1073
- Issue #6150: Fix test_unicode on wide-unicode builds.

1074 1075 1076
- Issue #6149: Fix initialization of WeakValueDictionary objects from non-empty
  parameters.

Martin v. Löwis's avatar
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1077 1078 1079
Windows
-------

1080 1081
- Issue #6221: Delete test registry key before running the test.

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1082 1083
- Issue #6158: Package Sine-1000Hz-300ms.aif in MSI file.

1084 1085 1086 1087 1088 1089 1090
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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1092 1093 1094 1095 1096 1097
Build
-----

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

1098 1099 1100 1101
- Issue #5809: Specifying both --enable-framework and --enable-shared is
  an error. Configure now explicity tells you about this.


1102

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1103 1104
What's New in Python 3.1 release candidate 1?
=============================================
Benjamin Peterson's avatar
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1105

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1106
*Release date: 2009-05-30*
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1107 1108 1109 1110

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

1111 1112 1113
- Issue #6097: Escape UTF-8 surrogates resulting from mbstocs conversion
  of the command line.

1114 1115
- Issue #6012: Add cleanup support to O& argument parsing.

1116 1117 1118
- Issue #6089: Fixed str.format with certain invalid field specifiers
  that would raise SystemError.

1119 1120 1121
- Issue #5982: staticmethod and classmethod now expose the wrapped
  function with __func__.

1122 1123
- Added support for multiple context managers in the same with-statement.
  Deprecated contextlib.nested() which is no longer needed.
1124

1125 1126 1127 1128
- Issue #5829: complex("1e500") no longer raises OverflowError.  This
  makes it consistent with float("1e500") and interpretation of real
  and imaginary literals.

1129 1130
- Issue #3527: Removed Py_WIN_WIDE_FILENAMES which is not used any more.

1131 1132
- Issue #5994: the marshal module now has docstrings.

1133 1134 1135 1136 1137 1138
- 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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1139 1140 1141
Library
-------

1142 1143
- Issue #4859: Implement PEP 383 for pwd, spwd, and grp.

1144 1145
- smtplib 'login' and 'cram-md5' login are also fixed (see Issue #5259).

1146 1147 1148
- Issue #6121: pydoc now ignores leading and trailing spaces in the
  argument to the 'help' function.

1149 1150 1151
- Issue #6118: urllib.parse.quote_plus ignored the encoding and errors
  arguments for strings with a space in them.

1152 1153 1154
- collections.namedtuple() was not working with the following field
  names:  cls, self, tuple, itemgetter, and property.

1155 1156 1157
- 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.

1158 1159 1160
- Issue #6050: Don't fail extracting a directory from a zipfile if
  the directory already exists.

1161 1162 1163 1164
- 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).

1165 1166 1167
- Issue #5761: Add the name of the underlying file to the repr() of various
  IO objects.

1168 1169 1170
- Issue #5259: smtplib plain auth login no longer gives a traceback.  Fix
  by Musashi Tamura, tests by Marcin Bachry.

1171 1172 1173 1174
- 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.

1175 1176 1177
- Issue #4066: smtplib.SMTP_SSL._get_socket now correctly returns the socket.
  Patch by Farhan Ahmad, test by Marcin Bachry.

1178 1179 1180
- Issue #2116: Weak references and weak dictionaries now support copy()ing and
  deepcopy()ing.

1181 1182
- Issue #1655: Make imaplib IPv6-capable. Patch by Derek Morr.

1183 1184
- Issue #5918: Fix a crash in the parser module.

1185 1186
- Issue #1664: Make nntplib IPv6-capable. Patch by Derek Morr.

1187 1188 1189 1190 1191
- 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.

1192 1193 1194 1195
- 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.

1196 1197 1198
- Issue 5955: aifc's close method did not close the file it wrapped,
  now it does.  This also means getfp method now returns the real fp.

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Installation
------------

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

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Extension Modules
-----------------

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- Issue #3061: Use wcsftime for time.strftime where available.
1211

1212 1213
- Issue #4873: Fix resource leaks in error cases of pwd and grp.

1214 1215
- Issue #6093: Fix off-by-one error in locale.strxfrm.

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- The _functools and _locale modules are now built into the libpython shared
  library instead of as extension modules.
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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.

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Tests
-----

- Issue 5442: Tests for importlib were not properly skipping case-sensitivity
  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?
================================

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*Release date: 2009-05-06*
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Core and Builtins
-----------------

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- Issue #5914: Add new C API function PyOS_string_to_double, and
  deprecate PyOS_ascii_strtod and PyOS_ascii_atof.

1246 1247 1248 1249
- 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.

1250 1251 1252 1253
- 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.

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- 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.

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

1265 1266 1267 1268
- 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__.

1269 1270 1271
- Issue #4426: The UTF-7 decoder was too strict and didn't accept some legal
  sequences. Patch by Nick Barnes and Victor Stinner.

1272
- Issue #3672: Reject surrogates in utf-8 codec; add surrogatepass error handler.
1273

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- 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.

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- 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.
1282

1283
- Issue #1588: Add complex.__format__. For example,
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  format(complex(1, 2./3), '.5') now produces a sensible result.

1286 1287 1288
- Issue #5864: Fix empty format code formatting for floats so that it
  never gives more than the requested number of significant digits.

1289 1290 1291
- Issue #5793: Rationalize isdigit / isalpha / tolower, etc. Includes
  new Py_ISDIGIT / Py_ISALPHA / Py_TOLOWER, etc. in pctypes.h.

1292 1293
- Issue #5835: Deprecate PyOS_ascii_formatd.

1294 1295 1296
- Issue #4971: Fix titlecase for characters that are their own
  titlecase, but not their own uppercase.

1297 1298
- Issue #5283: Setting __class__ in __del__ caused a segfault.

1299 1300 1301
- Issue #5816: complex(repr(z)) now recovers z exactly, even when
  z involves nans, infs or negative zeros.

1302
- Issue #3166: Make int -> float conversions correctly rounded.
1303

1304 1305 1306 1307 1308
- 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').

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- Issue #5787: object.__getattribute__(some_type, "__bases__") segfaulted on
  some builtin types.

1312 1313
- Issue #5772: format(1e100, '<') produces '1e+100', not '1.0e+100'.

1314 1315
- Issue #5515: str.format() type 'n' combined with commas and leading
  zeros no longer gives odd results with ints and floats.
1316 1317 1318 1319

- Implement PEP 378, Format Specifier for Thousands Separator, for
  floats.

1320
- The str function switches to exponential notation at
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  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.
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  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.
1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347

  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.

  See issue 1580 discussions for details of platforms for which
  this change does not apply.

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- Issue #5759: float() didn't call __float__ on str subclasses.

1350 1351 1352 1353 1354
- 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.

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- Issue #2170: refactored xml.dom.minidom.normalize, increasing both
  its clarity and its speed.

1358 1359 1360
- Issue #1113244: Py_XINCREF, Py_DECREF, Py_XDECREF: Add `do { ... } while (0)'
  to avoid compiler warnings.

1361 1362 1363
- Issue #3739: The unicode-internal encoder now reports the number of characters
  consumed like any other encoder (instead of the number of bytes).

1364 1365 1366 1367 1368
Installation
------------

- Issue #5756: Install idle and pydoc with a 3 suffix.

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Library
-------

1372 1373 1374
- Issue #5311: bdist_msi can now build packages that do not depend on a
  specific Python version.

1375 1376 1377
- Issue #5150: IDLE's format menu now has an option to strip trailing
  whitespace.

1378
- Issue #5940: distutils.command.build_clib.check_library_list was not doing
1379 1380
  the right type checkings anymore.

1381 1382 1383
- Issue #4875: On win32, ctypes.util.find_library does no longer
  return directories.

1384 1385
- Issue #5142: Add the ability to skip modules while stepping to pdb.

1386 1387 1388
- Issue #1309567: Fix linecache behavior of stripping subdirectories when
  looking for files given by a relative filename.

1389 1390 1391
- Issue #5923: Update the ``turtle`` module to version 1.1, add two new
  turtle demos in Demo/turtle.

1392 1393 1394
- Issue #5692: In :class:`zipfile.Zipfile`, fix wrong path calculation when
  extracting a file to the root directory.

1395 1396
- Issue #5913: os.listdir() should fail for empty path on windows.

1397 1398 1399 1400
- 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.

1401 1402
- The json module now works exclusively with str and not bytes.

1403 1404 1405
- Issue #3959: The ipaddr module has been added to the standard library.
  Contributed by Google.

1406 1407 1408
- Issue #3002: ``shutil.copyfile()`` and ``shutil.copytree()`` now raise an
  error when a named pipe is encountered, rather than blocking infinitely.

1409 1410
- Issue #5857: tokenize.tokenize() now returns named tuples.

1411 1412
- Issue #4305: ctypes should now build again on mipsel-linux-gnu

1413 1414 1415 1416
- 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.

1417 1418 1419 1420
- 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.

1421 1422 1423
- Issue #5854: Updated __all__ to include some missing names and remove some
  names which should not be exported.

1424 1425 1426 1427 1428
- 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.

1429 1430 1431 1432
- Issue #5812: For the two-argument form of the Fraction constructor,
  Fraction(m, n), m and n are permitted to be arbitrary Rational
  instances.

1433 1434 1435 1436
- 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.

1437 1438 1439
- Issue #5734: BufferedRWPair was poorly tested and had several glaring
  bugs. Patch by Brian Quinlan.

1440 1441 1442 1443 1444 1445
- 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.

1446 1447
- Issue #2703: SimpleXMLRPCDispatcher.__init__: Provide default values for
  new arguments introduced in 2.5.
1448 1449 1450 1451

- Issue #5828 (Invalid behavior of unicode.lower): Fixed bogus logic in
  makeunicodedata.py and regenerated the Unicode database (This fixes
  u'\u1d79'.lower() == '\x00').
1452

1453 1454 1455
Extension Modules
-----------------

1456 1457 1458
- Issue #5881: Remove old undocumented compatibility interfaces in hashlib and
  pwd.

1459 1460 1461 1462 1463
- 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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- Issue #5359: Readd the Berkley-DB detection code to allow _dbm be built
  using Berkley-DB.

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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.

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- Issue #5837: Certain sequences of calls to set() and unset() for
  support.EnvironmentVarGuard objects restored the environment variables
  incorrectly on __exit__.

1480 1481 1482 1483 1484
C-API
-----

- Issue #5630: A replacement PyCObject API, PyCapsule, has been added.

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What's New in Python 3.1 alpha 2?
=================================

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*Release date: 2009-4-4*
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Core and Builtins
-----------------
1493

1494 1495
- Implement PEP 378, Format Specifier for Thousands Separator, for
  integers.
1496

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1497 1498
- Issue #5666: Py_BuildValue's 'c' code should create byte strings.

1499 1500 1501
- Issue #5499: The 'c' code for argument parsing functions now only accepts a
  byte, and the 'C' code only accepts a unicode character.

1502 1503 1504
- Fix a problem in PyErr_NormalizeException that leads to "undetected errors"
  when hitting the recursion limit under certain circumstances.

1505 1506
- Issue #1665206: Remove the last eager import in _warnings.c and make it lazy.

1507 1508 1509
- Fix a segfault when running test_exceptions with coverage, caused by
  insufficient checks in accessors of Exception.__context__.

1510 1511 1512 1513
- 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.

1514 1515
- Issue #5126: str.isprintable() returned False for space characters.

1516 1517 1518
- 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.

1519 1520 1521 1522 1523
- 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.

1524 1525 1526 1527
- 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.

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- 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.

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- 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.

1539 1540 1541
- Issue #5237: Allow auto-numbered fields in str.format(). For
  example: '{} {}'.format(1, 2) == '1 2'.

1542 1543 1544
- 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.

1545 1546 1547
- Issue #3845: In PyRun_SimpleFileExFlags avoid invalid memory access with
  short file names.

1548 1549 1550
Library
-------

1551
- Issue #2625: added missing items() call to the for loop in
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  mailbox.MH.get_message().

1554 1555 1556 1557
- Issue #5640: Fix _multibytecodec so that CJK codecs don't repeat
  error substitutions from non-strict codec error callbacks in
  incrementalencoder and StreamWriter.

1558 1559 1560
- Issue #5656: Fix the coverage reporting when running the test suite with
  the -T argument.

1561 1562
- Issue #5647: MutableSet.__iand__() no longer mutates self during iteration.

1563 1564
- Issue #5624: Fix the _winreg module name still used in several modules.

1565 1566
- Issue #5628: Fix io.TextIOWrapper.read() with a unreadable buffer.

1567 1568 1569
- Issue #5619: Multiprocessing children disobey the debug flag and causes
  popups on windows buildbots. Patch applied to work around this issue.

1570 1571
- Issue #5400: Added patch for multiprocessing on netbsd compilation/support

1572 1573
- Issue #5387: Fixed mmap.move crash by integer overflow.

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1574 1575 1576
- Issue #5261: Patch multiprocessing's semaphore.c to support context
  manager use: "with multiprocessing.Lock()" works now.

1577 1578 1579
- 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
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- 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.

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1584 1585
- Issue #5595: Fix UnboundedLocalError in ntpath.ismount().

1586 1587 1588
- Issue #1174606: Calling read() without arguments of an unbounded file
  (typically /dev/zero under Unix) could crash the interpreter.

1589 1590 1591
- The max_buffer_size arguments of io.BufferedWriter, io.BufferedRWPair, and
  io.BufferedRandom have been deprecated for removal in Python 3.2.

1592 1593 1594 1595 1596
- 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.

1597 1598 1599
- Issue #2110: Add support for thousands separator and 'n' type
  specifier to Decimal.__format__

1600 1601 1602
- Fix Decimal.__format__ bug that swapped the meanings of the '<' and
  '>' alignment characters.

1603 1604 1605
- The error detection code in FileIO.close() could fail to reflect the `errno`
  value, and report it as -1 instead.

1606 1607 1608
- Issue #5016: FileIO.seekable() could return False if the file position
  was negative when truncated to a C int. Patch by Victor Stinner.

1609 1610 1611
Extension Modules
-----------------

1612 1613
- Issue #5391: mmap now deals exclusively with bytes.

1614 1615
- Issue #5463: In struct module, remove deprecated overflow wrapping
  when packing an integer: struct.pack('=L', -1) now raises
1616 1617 1618
  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.
1619

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What's New in Python 3.1 alpha 1
Barry Warsaw's avatar
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================================
Barry Warsaw's avatar
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Benjamin Peterson's avatar
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*Release date: 2009-03-07*
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Core and Builtins
-----------------

1629 1630
- The io module has been reimplemented in C for speed.

1631 1632
- Give dict views an informative __repr__.

1633 1634 1635
- Issue #5247: Improve error message when unknown format codes are
  used when using str.format() with str, int, and float arguments.

1636 1637 1638
- Issue #5249: time.strftime returned malformed string when format string
  contained non ascii character on windows.

1639 1640 1641
- Issue #4626: compile(), exec(), and eval() ignore the coding cookie if the
  source has already been decoded into str.

1642 1643 1644
- Issue #5186: Reduce hash collisions for objects with no __hash__ method by
  rotating the object pointer by 4 bits to the right.

1645 1646 1647
- Issue #4575: Fix Py_IS_INFINITY macro to work correctly on x87 FPUs:
  it now forces its argument to double before testing for infinity.

1648 1649 1650
- Issue #5137: Make len() correctly raise a TypeError when a __len__ method
  returns a non-number type.

1651 1652
- Issue #5182: Removed memoryview.__str__.

1653 1654
- Issue #1717: Removed builtin cmp() function, dropped tp_compare
  slot, the C API functions PyObject_Compare and PyUnicode_Compare and
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  the type definition cmpfunc.  The tp_compare slot has been renamed
  to tp_reserved, and is reserved for future usage.
1657

1658
- Issue #1242657: the __len__() and __length_hint__() calls in several tools
1659 1660
  were suppressing all exceptions.  These include list() and bytearray().

1661 1662 1663
- Issue #4707: round(x, n) now returns an integer if x is an integer.
  Previously it returned a float.

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- 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.

1669 1670
- Issue #4874: Most builtin decoders now reject unicode input.

1671 1672 1673
- Issue #4842: Don't allow trailing 'L' when constructing an integer
  from a string.

1674 1675
- Issue #4991: os.fdopen now raises an OSError for invalid file descriptors.

1676 1677 1678
- Issue #4838: When a module is deallocated, free the memory backing the
  optional module state data.

1679 1680 1681
- Issue #4910: Rename nb_long slot to nb_reserved, and change its
  type to (void *).

1682 1683 1684 1685
- 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.

1686 1687 1688
- Issue #3720: Fix a crash when an iterator modifies its class and removes its
  __next__ method.

1689 1690 1691 1692
- 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.

1693 1694
- Issue #4893: Use NT threading on CE.

1695 1696
- Issue #4915: Port sysmodule to Windows CE.

1697 1698 1699 1700
- 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.

1701 1702 1703 1704 1705 1706
- 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.

1707
- Issue #4604: Some objects of the I/O library could still be used after
1708 1709 1710
  having been closed (for instance, a read() call could return some
  previously buffered data). Patch by Dmitry Vasiliev.

1711 1712 1713 1714 1715
- 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).

1716 1717 1718 1719
- 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).

1720 1721 1722 1723 1724 1725
- 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.

1726 1727 1728 1729
- 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.

1730 1731
- Issue #4075: Use OutputDebugStringW in Py_FatalError.

1732 1733 1734
- 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.

1735
- Issue #4797: IOError.filename was not set when _fileio.FileIO failed to open
1736
  file with `bytes' filename on Windows.
1737

1738 1739 1740
- Issue #3680: Reference cycles created through a dict, set or deque iterator
  did not get collected.

1741 1742 1743
- Issue #4701: PyObject_Hash now implicitly calls PyType_Ready on types
  where the tp_hash and tp_dict slots are both NULL.

1744 1745 1746
- Issue #4759: None is now allowed as the first argument of
  bytearray.translate().  It was always allowed for bytes.translate().

1747 1748 1749
- Added test case to ensure attempts to read from a file opened for writing
  fail.

1750 1751
- Issue #3106: Speedup some comparisons (str/str and int/int).

1752 1753 1754
- Issue #2183: Simplify and optimize bytecode for list, dict and set
  comprehensions. Original patch for list comprehensions by Neal Norwitz.

1755 1756 1757 1758
- 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.

1759 1760
- Issue #3439: Add a bit_length method to int.

1761 1762 1763 1764
- 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.

1765 1766 1767 1768
- Issue #4597: Fixed several opcodes that weren't always propagating
  exceptions.

- Issue #4589: Fixed exception handling when the __exit__ function of a
1769 1770
  context manager returns a value that cannot be converted to a bool.

1771 1772 1773 1774 1775
- 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.

1776 1777 1778 1779
- 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.

1780 1781 1782
- Issue #4509: Various issues surrounding resize of bytearray objects to
  which there are buffer exports (e.g. memoryview instances).

1783 1784 1785 1786
- 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``.
1787

1788 1789 1790
- Issue #4569: Interpreter crash when mutating a memoryview with an item size
  larger than 1.

1791 1792
- Issue #4748: Lambda generators no longer return a value.

1793 1794
- The re.sub(), re.subn() and re.split() functions now accept a flags parameter.

1795 1796 1797 1798 1799
- 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
1800 1801
Library
-------
1802

1803 1804 1805
- Issue #7071: byte-compilation in Distutils is now done with respect to
  sys.dont_write_bytecode.

1806 1807 1808
- Issue #7066: archive_util.make_archive now restores the cwd if an error is 
  raised. Initial patch by Ezio Melotti.

1809
- Issue #6516: Added owner/group support when creating tar archives in
1810 1811
  Distutils.

1812 1813
- Issue #6954: Fixed crash when using DISTUTILS_DEBUG flag in Distutils.

1814 1815 1816 1817
- Issue #6163: Fixed HP-UX runtime library dir options in
  distutils.unixcompiler. Initial patch by Sridhar Ratnakumar and
  Michael Haubenwallner.

1818 1819
- Issue #6693: New functions in site.py to get user/global site packages paths.

1820 1821 1822 1823
- 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
1824 1825
  behavior is similar when used with -O.

1826 1827
- unittest has been split up into a package.  All old names should still work.

1828 1829 1830 1831 1832
- 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.

1833 1834 1835 1836 1837 1838 1839
- Issue #6433: fixed issues with multiprocessing.pool.map hanging on empty list

- Issue #6314: logging: Extra checks on the "level" argument in more places.

- Issue #2622: Fixed an ImportError when importing email.messsage from a
  standalone application built with py2exe or py2app.

1840
- Issue #6455: Fixed test_build_ext under win32.
1841

1842
- Issue #6377: Enabled the compiler option, and deprecate its usage as an
1843 1844
  attribute.

1845 1846
- Issue #6413: Fixed the log level in distutils.dist for announce.

1847 1848
- Issue #6403: Fixed package path usage in build_ext.

1849 1850 1851 1852
- Issues #5155, 5313, 5331: multiprocessing.Process._bootstrap was
  unconditionally calling "os.close(sys.stdin.fileno())" resulting in file
  descriptor errors

1853
- Issue #6365: Distutils build_ext inplace mode was copying the compiled
1854 1855
  extension in a subdirectory if the extension name had dots.

1856
- Issue #6164: Added an AIX specific linker argument in Distutils
1857 1858
  unixcompiler. Original patch by Sridhar Ratnakumar.

1859 1860 1861
- Issue #6286: Now Distutils upload command is based on urllib2 instead of
  httplib, allowing the usage of http_proxy.

1862 1863
- Issue #6287: Added the license field in Distutils documentation.

1864 1865
- Issue #6263: Fixed syntax error in distutils.cygwincompiler.

1866 1867 1868 1869
- 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.

1870 1871 1872
- Issue #6131: test_modulefinder leaked when run after test_distutils.
  Patch by Hirokazu Yamamoto.

1873 1874
- Issue #6048: Now Distutils uses the tarfile module in archive_util.

1875
- Issue #6062: In distutils, fixed the package option of build_ext. Feedback
1876 1877
  and tests on pywin32 by Tim Golden.

1878 1879
- Issue #6053: Fixed distutils tests on win32. patch by Hirokazu Yamamoto.

1880 1881 1882
- Issue #6046: Fixed the library extension when distutils build_ext is used
  inplace. Initial patch by Roumen Petrov.

1883
- Issue #6041: Now distutils `sdist` and `register` commands use `check` as a
1884 1885
  subcommand.

1886 1887 1888
- Issue #6022: a test file was created in the current working directory by
  test_get_outputs in Distutils.

1889 1890 1891
- Issue #5977: distutils build_ext.get_outputs was not taking into account the
  inplace option. Initial patch by kxroberto.

1892 1893 1894
- Issue #5984: distutils.command.build_ext.check_extensions_list checks were broken
  for old-style extensions.

1895 1896
- Issue #5976: Fixed Distutils test_check_environ.

1897 1898 1899 1900 1901
- 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.

1902 1903
- Issue #2245: aifc now skips chunk types it doesn't recognize, per spec.

1904
- Issue #5874: distutils.tests.test_config_cmd is not locale-sensitive
1905 1906
  anymore.

1907
- Issue #5810: Fixed Distutils test_build_scripts so it uses
1908 1909
  sysconfig.get_config_vars.

1910 1911
- Issue #4951: Fixed failure in test_httpservers.

Thomas Heller's avatar
Thomas Heller committed
1912 1913
- Issue #5795: Fixed test_distutils failure on Debian ppc.

1914 1915
- Issue #5607: fixed Distutils test_get_platform for Mac OS X fat binaries.

1916 1917 1918
- Issue #5741: don't disallow "%%" (which is an escape for "%") when setting
  a value in SafeConfigParser.

1919 1920
- Issue #5732: added a new command in Distutils: check.

1921
- Issue #5731: Distutils bdist_wininst no longer worked on non-Windows
1922 1923
  platforms. Initial patch by Paul Moore.

1924 1925 1926
- Issue #5095: Added bdist_msi to the list of bdist supported formats.
  Initial fix by Steven Bethard.

1927 1928 1929
- Issue #1491431: Fixed distutils.filelist.glob_to_re for edge cases.
  Initial fix by Wayne Davison.

1930
- Issue #5694: removed spurious test output in Distutils (test_clean).
1931

1932
- Issue #1326077: fix the formatting of SyntaxErrors by the traceback module.
1933

1934 1935 1936 1937
- 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.

1938 1939 1940 1941
- 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.

1942 1943 1944
- Issue #5583: Added optional Extensions in Distutils. Initial patch by Georg
  Brandl.

1945 1946 1947
- Issue #1222: locale.format() bug when the thousands separator is a space
  character.

1948 1949 1950
- Issue #5472: Fixed distutils.test_util tear down. Original patch by
  Tim Golden.

1951 1952
- collections.deque() objects now have a read-only attribute called maxlen.

1953 1954 1955 1956
- 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.

1957 1958 1959 1960 1961 1962
- 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.

1963 1964 1965
- Issue #5394: removed > 2.3 syntax from distutils.msvc9compiler.
  Original patch by Akira Kitada.

1966 1967
- Issue #5334: array.fromfile() failed to insert values when EOFError was raised.

1968 1969
- Issue #5385: Fixed mmap crash after resize failure on windows.

1970 1971
- Issue #5179: Fixed subprocess handle leak on failure on windows.

Raymond Hettinger's avatar
Raymond Hettinger committed
1972 1973
- PEP 372:  Added collections.OrderedDict().

1974 1975
- The _asdict() for method for namedtuples now returns an OrderedDict().

1976 1977
- configparser now defaults to using an ordered dictionary.

Benjamin Peterson's avatar
Benjamin Peterson committed
1978 1979 1980
- Issue #5401: Fixed a performance problem in mimetypes when ``from mimetypes
  import guess_extension`` was used.

1981 1982 1983
- Issue #1733986: Fixed mmap crash in accessing elements of second map object
  with same tagname but larger size than first map. (Windows)

1984 1985 1986
- Issue #5386: mmap.write_byte didn't check map size, so it could cause buffer
  overrun.

1987 1988 1989 1990 1991
- Issue #1533164: Installed but not listed *.pyo was breaking Distutils
  bdist_rpm command.

- Issue #5378: added --quiet option to Distutils bdist_rpm command.

1992 1993
- Issue #5052: make Distutils compatible with 2.3 again.

1994 1995
- Issue #5316: Fixed buildbot failures introduced by multiple inheritance
  in Distutils tests.
Barry Warsaw's avatar
Barry Warsaw committed
1996

1997 1998 1999
- Issue #5287: Add exception handling around findCaller() call to help out
  IronPython.

2000 2001 2002 2003 2004
- 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)].

2005
- Issue #2279: distutils.sdist.add_defaults now add files
2006 2007
  from the package_data and the data_files metadata.

2008
- Issue #5257: refactored all tests in distutils, so they use
2009 2010
  support.TempdirManager, to avoid writing in the tests directory.

2011 2012 2013
- Issue #4524: distutils build_script command failed with --with-suffix=3.
  Initial patch by Amaury Forgeot d'Arc.

2014 2015
- Issue #2461: added tests for distutils.util

2016 2017 2018 2019
- 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.

2020 2021 2022
- Issue #4631: Fix urlopen() result when an HTTP response uses chunked
  encoding.

2023 2024 2025
- Issue #5203: Fixed ctypes segfaults when passing a unicode string to a
  function without argtypes (only occurs if HAVE_USABLE_WCHAR_T is false).

2026 2027 2028
- Issue #3386: distutils.sysconfig.get_python_lib prefix argument was ignored
  under NT and OS2. Patch by Philip Jenvey.

2029 2030 2031 2032
- 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.

2033 2034 2035
- Issue #5122: Synchronize tk load failure check to prevent a potential
  deadlock.

2036 2037 2038 2039
- 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, ...

2040 2041
- Issue #4890: Handle empty text search pattern in Tkinter.Text.search.

2042 2043 2044
- Issue #4512 (part 2): Promote ``ZipImporter._get_filename()`` to be a
  public documented method ``ZipImporter.get_filename()``.

2045 2046 2047 2048 2049
- 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.

2050 2051 2052 2053 2054
- 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.

2055 2056 2057
- Issue #4285: Change sys.version_info to be a named tuple. Patch by
  Ross Light.

2058
- Issue #1520877: Now distutils.sysconfig reads $AR from the
2059 2060
  environment/Makefile. Patch by Douglas Greiman.

2061 2062 2063
- Issue #1276768: The verbose option was not used in the code of
  distutils.file_util and distutils.dir_util.

2064
- Issue #5132: Fixed trouble building extensions under Solaris with
2065 2066
  --enabled-shared activated. Initial patch by Dave Peterson.

2067 2068
- Issue #1581476: Always use the Tcl global namespace when calling into Tcl.

2069 2070
- The shelve module now defaults to pickle protocol 3.

2071 2072 2073
- Fix a bug in the trace module where a bytes object from co_lnotab had its
  items being passed through ord().

2074 2075 2076 2077
- 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").

2078 2079
- Added the ttk module. See issue #2983: Ttk support for Tkinter.

2080 2081 2082 2083
- Removed isSequenceType(), isMappingType, and isNumberType() from the
  operator module; use the abstract base classes instead.  Also removed
  the repeat() function; use mul() instead.

2084
- Issue #5021:  doctest.testfile() did not create __name__ and
2085 2086 2087 2088 2089
  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.

2090 2091 2092
- Issue #1885: distutils. When running sdist with --formats=tar,gztar
  the tar file was overriden by the gztar one.

2093 2094
- Issue #4863: distutils.mwerkscompiler has been removed.

2095 2096
- Added a new itertools functions:  combinations_with_replacement()
  and compress().
2097

2098
- Issue #5032:  added a step argument to itertools.count() and
2099 2100
  allowed non-integer arguments.

Jesse Noller's avatar
Jesse Noller committed
2101 2102 2103 2104
- Fix and properly document the multiprocessing module's logging
  support, expose the internal levels and provide proper usage
  examples.

2105 2106 2107
- Issue #1672332: fix unpickling of subnormal floats, which was
  producing a ValueError on some platforms.

2108 2109 2110
- Issue #3881: Help Tcl to load even when started through the
  unreadable local symlink to "Program Files" on Vista.

2111 2112 2113
- Issue #4710: Extract directories properly in the zipfile module;
  allow adding directories to a zipfile.

2114
- Issue #3807: _multiprocessing build fails when configure is passed
Jesse Noller's avatar
Jesse Noller committed
2115 2116 2117
  --without-threads argument. When this occurs, _multiprocessing will
  be disabled, and not compiled.

2118 2119 2120 2121 2122
- 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.

2123 2124 2125
- Issue #5013: Fixed a bug in FileHandler which occurred when the delay
  parameter was set.

2126 2127 2128
- Issue #4842: Always append a trailing 'L' when pickling longs using
  pickle protocol 0.  When reading, the 'L' is optional.

2129 2130
- Add the importlib package.

Jesse Noller's avatar
Jesse Noller committed
2131 2132 2133
- Issue #4301: Patch the logging module to add processName support, remove
  _check_logger_class from multiprocessing.

2134
- Issue #3325: Remove python2.x try: except: imports for old cPickle from
2135
  multiprocessing.
2136

2137 2138 2139
- Issue #4959: inspect.formatargspec now works for keyword only arguments
  without defaults.

Jesse Noller's avatar
Jesse Noller committed
2140 2141 2142 2143
- Issue #3321: _multiprocessing.Connection() doesn't check handle; added checks
  for *nix machines for negative handles and large int handles. Without this check
  it is possible to segfault the interpreter.

2144 2145 2146 2147 2148 2149
- 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__.

2150 2151 2152 2153
- 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.

2154 2155 2156
- Issue #1696199:  Add collections.Counter() for rapid and convenient
  counting.

2157 2158
- Issue #3860: GzipFile and BZ2File now support the context manager protocol.

2159 2160 2161
- Issue #4867: Fixed a crash in ctypes when passing a string to a
  function without defining argtypes.

2162 2163 2164 2165 2166
- 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.

2167 2168
- Restore Python 2.3 compatibility for decimal.py.

2169 2170 2171
- Issue #3638: Remove functions from _tkinter module level that depend on
  TkappObject to work with multiple threads.

2172 2173
- Issue #4718: Adapt the wsgiref package so that it actually works with
  Python 3.x, in accordance with the `official amendments of the spec
2174 2175
  <http://www.wsgi.org/wsgi/Amendments_1.0>`_.

2176 2177 2178
- Issue #4796: Added Decimal.from_float() and Context.create_decimal_from_float()
  to the decimal module.

2179 2180 2181
- Fractions.from_float() no longer loses precision for integers too big to
  cast as floats.

2182 2183 2184
- Issue #4812: add missing underscore prefix to some internal-use-only
  constants in the decimal module.  (Dec_0 becomes _Dec_0, etc.)

2185
- Issue #4790: The nsmallest() and nlargest() functions in the heapq module
2186 2187
  did unnecessary work in the common case where no key function was specified.

2188 2189 2190
- Issue #4795: inspect.isgeneratorfunction() returns False instead of None when
  the function is not a generator.

2191 2192
- Issue #4702: Throwing a DistutilsPlatformError instead of IOError in case
  no MSVC compiler is found under Windows. Original patch by Philip Jenvey.
2193

2194
- Issue #4646: distutils was choking on empty options arg in the setup
2195 2196
  function. Original patch by Thomas Heller.

2197 2198
- Issue #3767: Convert Tk object to string in tkColorChooser.

2199 2200
- Issue #3248: Allow placing ScrolledText in a PanedWindow.

2201 2202 2203
- Issue #4444: Allow assertRaises() to be used as a context handler, so that
  the code under test can be written inline if more practical.

2204 2205 2206
- Issue #4739: Add pydoc help topics for symbols, so that e.g. help('@')
  works as expected in the interactive environment.

2207 2208 2209
- Issue #4756: zipfile.is_zipfile() now supports file-like objects. Patch by
  Gabriel Genellina.

2210 2211 2212
- Issue #4574: reading an UTF16-encoded text file crashes if \r on 64-char
  boundary.

2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231
- 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.

2232 2233 2234
- Issue #4163: textwrap module: allow word splitting on a hyphen preceded by
  a non-ASCII letter.

2235 2236
- Issue #4616: TarFile.utime(): Restore directory times on Windows.

2237 2238 2239
- Issue #4021: tokenize.detect_encoding() now raises a SyntaxError when the
  codec cannot be found.  This is for compatibility with the builtin behavior.

2240 2241 2242 2243
- 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.

2244 2245 2246
- Issue #4483: _dbm module now builds on systems with gdbm & gdbm_compat
  libs.

2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262
- 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.

2263 2264 2265 2266 2267 2268 2269 2270 2271
- 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.

2272 2273 2274
- Issue #4542: On Windows, binascii.crc32 still accepted str as binary input;
  the corresponding tests now pass.

2275 2276 2277
- Issue #4537: webbrowser.UnixBrowser would fail to open the browser because
  it was calling the wrong open() function.

2278 2279 2280 2281
- Issue #1055234: cgi.parse_header(): Fixed parsing of header parameters to
  support unusual filenames (such as those containing semi-colons) in
  Content-Disposition headers.

2282 2283 2284
- 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
2285 2286 2287 2288
- 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().

2289 2290
- Windows locale mapping updated to Vista.

2291 2292 2293
Tools/Demos
-----------

2294 2295 2296
- Issue #4704: remove use of cmp() in pybench, bump its version number to 2.1,
  and make it 2.6-compatible.

2297 2298
- Ttk demos added in Demo/tkinter/ttk/

2299 2300
- Issue #4677: add two list comprehension tests to pybench.

2301 2302 2303 2304

Build
-----

2305 2306
- Issue #6094: Build correctly with Subversion 1.7.

2307 2308
- Issue #5847: Remove -n switch on "Edit with IDLE" menu item.

2309 2310 2311
- Issue #5726: Make Modules/ld_so_aix return the actual exit code of the
  linker, rather than always exit successfully. Patch by Floris Bruynooghe.

2312
- Issue #4587: Add configure option --with-dbmliborder=db1:db2:... to specify
2313
  the order that backends for the dbm extension are checked.
2314

2315 2316
- Link the shared python library with $(MODLIBS).

2317 2318
- Issue #5134: Silence compiler warnings when compiling sqlite with VC++.

2319 2320
- Issue #4494: Fix build with Py_NO_ENABLE_SHARED on Windows.

2321 2322
- Issue #4895: Use _strdup on Windows CE.

2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346
- 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
-----

2347 2348 2349
- Issue #6624: yArg_ParseTuple with "s" format when parsing argument with
  NUL: Bogus TypeError detail string.

2350 2351 2352
- Issue #5175: PyLong_AsUnsignedLongLong now raises OverflowError
  for negative arguments.  Previously, it raised TypeError.

2353 2354 2355 2356 2357 2358 2359 2360 2361
- 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.


2362 2363 2364
Extension Modules
-----------------

2365 2366 2367 2368
- 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).

2369 2370
- Issue #4397: Fix occasional test_socket failure on OS X.

2371 2372
- Issue #4279: Fix build of parsermodule under Cygwin.

2373 2374 2375 2376
- 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.

2377 2378
- Issue #4051: Prevent conflict of UNICODE macros in cPickle.

2379 2380 2381 2382
- 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.

2383 2384
- Issue #4228: Pack negative values the same way as 2.4 in struct's L format.

2385 2386
- Issue #1040026: Fix os.times result on systems where HZ is incorrect.

2387 2388
- Issues #3167, #3682: Fix test_math failures for log, log10 on Solaris,
  OpenBSD.
2389

2390 2391 2392 2393
- Issue #4583: array.array would not always prohibit resizing when a buffer
  has been exported, resulting in an interpreter crash when accessing the
  buffer.

2394

2395 2396
- Issue #5228: Make functools.partial objects can now be pickled.

2397 2398 2399
Tests
-----

2400 2401 2402
- Issue #6152: New option '-j'/'--multiprocess' for regrtest allows running
  regression tests in parallel, shortening the total runtime.

2403 2404 2405 2406 2407
- 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.

2408
- regrtest no longer treats ImportError as equivalent to SkipTest.  Imports
2409
  that should cause a test to be skipped are now done using import_module
2410 2411
  from test support, which does the conversion.

2412 2413 2414
- Issue #5083: New 'gui' resource for regrtest.


2415 2416 2417
Docs
----

2418

2419
**(For information about older versions, consult the HISTORY file.)**