Merge tag 'v3.7.0a4'

Include/patchlevel.h

@@ -20,10 +20,10 @@
 #define PY_MINOR_VERSION        7
 #define PY_MICRO_VERSION        0
 #define PY_RELEASE_LEVEL        PY_RELEASE_LEVEL_ALPHA
-#define PY_RELEASE_SERIAL       3
+#define PY_RELEASE_SERIAL       4
 
 /* Version as a string */
-#define PY_VERSION              "3.7.0a3+"
+#define PY_VERSION              "3.7.0a4"
 /*--end constants--*/
 
 /* Version as a single 4-byte hex number, e.g. 0x010502B2 == 1.5.2b2.

Misc/NEWS.d/next/C API/2017-12-07-15-58-15.bpo-32241.LbyQt6.rst

-:c:func:`Py_SetProgramName` and :c:func:`Py_SetPythonHome` now take the
-``const wchar *`` arguments instead of ``wchar *``.

Misc/NEWS.d/next/C API/2017-12-12-23-09-46.bpo-32264.ahRlOI.rst

-Moved the pygetopt.h header into internal/, since it has no public APIs.

Misc/NEWS.d/next/C API/2017-12-16-09-59-35.bpo-29084.ZGJ-LJ.rst

-Undocumented C API for OrderedDict has been excluded from the limited C API.
-It was added by mistake and actually never worked in the limited C API.

Misc/NEWS.d/next/C API/2017-12-20-23-22-32.bpo-32030.d1dcwh.rst

-Py_Initialize() doesn't reset the memory allocators to default if the
-``PYTHONMALLOC`` environment variable is not set.

Misc/NEWS.d/next/Core and Builtins/2017-07-26-00-20-15.bpo-29469.potmyI.rst

-Move constant folding from bytecode layer to AST layer.
-Original patch by Eugene Toder.

Misc/NEWS.d/next/Core and Builtins/2017-11-26-14-38-44.bpo-31650.JWf_Im.rst

-Implement PEP 552 (Deterministic pycs). Python now supports invalidating
-bytecode cache files bashed on a source content hash rather than source
-last-modified time.

Misc/NEWS.d/next/Core and Builtins/2017-11-28-15-04-14.bpo-31901.mDeCLK.rst

-The `atexit` module now has its callback stored per interpreter.

Misc/NEWS.d/next/Core and Builtins/2017-12-05-21-33-47.bpo-32225.ucKjvw.rst

-PEP 562: Add support for module ``__getattr__`` and ``__dir__``. Implemented by Ivan
-Levkivskyi.

Misc/NEWS.d/next/Core and Builtins/2017-12-05-21-42-58.bpo-32226.G8fqb6.rst

-PEP 560: Add support for __mro_entries__ and __class_getitem__. Implemented
-by Ivan Levkivskyi.

Misc/NEWS.d/next/Core and Builtins/2017-12-05-23-10-58.bpo-29240.qpJP5l.rst

-Add a new UTF-8 mode: implementation of the :pep:`540`.

Misc/NEWS.d/next/Core and Builtins/2017-12-06-20-18-34.bpo-32230.PgGQaB.rst

-`-X dev` now injects a ``'default'`` entry into sys.warnoptions, ensuring
-that it behaves identically to actually passing ``-Wdefault`` at the command
-line.

Misc/NEWS.d/next/Core and Builtins/2017-12-07-17-22-30.bpo-20361.zQUmbi.rst

-``-b`` and ``-bb`` now inject ``'default::BytesWarning'`` and
-``error::BytesWarning`` entries into ``sys.warnoptions``, ensuring that they
-take precedence over any other warning filters configured via the ``-W``
-option or the ``PYTHONWARNINGS`` environment variable.

Misc/NEWS.d/next/Core and Builtins/2017-12-07-23-44-29.bpo-31506.j1U2fU.rst

-Improve the error message logic for object.__new__ and object.__init__.
-Patch by Sanyam Khurana.

Misc/NEWS.d/next/Core and Builtins/2017-12-09-11-03-51.bpo-32260.1DAO-p.rst

-Don't byte swap the input keys to the SipHash algorithm on big-endian
-platforms. This should ensure siphash gives consistent results across
-platforms.

Misc/NEWS.d/next/Core and Builtins/2017-12-11-01-52-42.bpo-30579.X6cEzf.rst

-Implement TracebackType.__new__ to allow Python-level creation of
-traceback objects, and make TracebackType.tb_next mutable.

Misc/NEWS.d/next/Core and Builtins/2017-12-12-14-02-28.bpo-32282.xFVMTn.rst

-Fix an unnecessary ifdef in the include of VersionHelpers.h in socketmodule
-on Windows.

Misc/NEWS.d/next/Core and Builtins/2017-12-14-11-48-19.bpo-30416.hlHo_9.rst

-The optimizer is now protected from spending much time doing complex
-calculations and consuming much memory for creating large constants in
-constant folding. Increased limits for constants that can be produced in
-constant folding.

Misc/NEWS.d/next/Core and Builtins/2017-12-15-00-13-04.bpo-32329.q47IN2.rst

-The :option:`-R` option now turns on hash randomization when the
-:envvar:`PYTHONHASHSEED` environment variable is set to ``0``. Previously,
-the option was ignored. Moreover, ``sys.flags.hash_randomization`` is now
-properly set to 0 when hash randomization is turned off by
-``PYTHONHASHSEED=0``.

Misc/NEWS.d/next/Core and Builtins/2017-12-15-11-50-06.bpo-27169.VO84fQ.rst

-The ``__debug__`` constant is now optimized out at compile time. This fixes also
-bpo-22091.

Misc/NEWS.d/next/Core and Builtins/2017-12-16-14-30-21.bpo-32259.GoOJiX.rst

-The error message of a TypeError raised when unpack non-iterable is now more
-specific.

Misc/NEWS.d/next/Core and Builtins/2017-12-19-21-14-41.bpo-32379.B7mOmI.rst

-Make MRO computation faster when a class inherits from a single base.

Misc/NEWS.d/next/Core and Builtins/2017-12-22-13-28-07.bpo-32390.QPj083.rst

-Fix the compilation failure on AIX after the f_fsid field has been added to the object returned by os.statvfs() (issue #32143). Original patch by Michael Felt.

Misc/NEWS.d/next/Core and Builtins/2017-12-22-13-38-17.bpo-32399.wlH12z.rst

-Add AIX uuid library support for RFC4122 using uuid_create() in libc.a

Misc/NEWS.d/next/Core and Builtins/2018-01-04-15-06-15.bpo-32226.7cAvRG.rst

-``__class_getitem__`` is now an automatic class method.

Misc/NEWS.d/next/Core and Builtins/2018-01-05-20-54-27.bpo-31975.AmftlU.rst

-The default warning filter list now starts with a
-"default::DeprecationWarning:__main__" entry, so deprecation warnings are
-once again shown by default in single-file scripts and at the interactive
-prompt.

Misc/NEWS.d/next/Documentation/2017-12-24-17-29-37.bpo-32418.eZe-ID.rst

-Add get_loop() method to Server and AbstractServer classes.

Misc/NEWS.d/next/Library/2017-09-16-02-56-33.bpo-15216.lqXCTT.rst

-``TextIOWrapper.reconfigure()`` supports changing *encoding*, *errors*, and
-*newline*.

Misc/NEWS.d/next/Library/2017-10-05-11-06-32.bpo-31699.MF47Y6.rst

-Fix deadlocks in :class:`concurrent.futures.ProcessPoolExecutor` when
-task arguments or results cause pickling or unpickling errors.
-This should make sure that calls to the :class:`ProcessPoolExecutor` API
-always eventually return.

Misc/NEWS.d/next/Library/2017-10-10-18-56-46.bpo-30241.F_go20.rst

-Add contextlib.AbstractAsyncContextManager. Patch by Jelle Zijlstra.

Misc/NEWS.d/next/Library/2017-10-17-14-52-14.bpo-31802.sYj2Zv.rst

-Importing native path module (``posixpath``, ``ntpath``) now works even if
-the ``os`` module still is not imported.

Misc/NEWS.d/next/Library/2017-10-18-17-29-30.bpo-31778.B6vAkP.rst

-ast.literal_eval() is now more strict. Addition and subtraction of
-arbitrary numbers no longer allowed.

Misc/NEWS.d/next/Library/2017-11-02-11-57-41.bpo-27456.snzyTC.rst

-Ensure TCP_NODELAY is set on Linux. Tests by Victor Stinner.

Misc/NEWS.d/next/Library/2017-11-10-00-05-08.bpo-31993.-OMNg8.rst

-The picklers do no longer allocate temporary memory when dumping large
-``bytes`` and ``str`` objects into a file object. Instead the data is
-directly streamed into the underlying file object.
-
-Previously the C implementation would buffer all content and issue a
-single call to ``file.write`` at the end of the dump. With protocol 4
-this behavior has changed to issue one call to ``file.write`` per frame.
-
-The Python pickler with protocol 4 now dumps each frame content as a
-memoryview to an IOBytes instance that is never reused and the
-memoryview is no longer released after the call to write. This makes it
-possible for the file object to delay access to the memoryview of
-previous frames without forcing any additional memory copy as was
-already possible with the C pickler.

Misc/NEWS.d/next/Library/2017-11-24-08-35-43.bpo-26439.IC45_f.rst

-Fix ctypes.util.find_library() for AIX
-by implementing ctypes._aix.find_library()
-Patch by: Michael Felt aka aixtools
-
-ctypes.util.find_library has always returned None on a standard AIX.
-With this patch there is support for both AIX and svr4 shared libraries.
-None is returned only when there is nothinbg found. Normal behavior is now:
-on AIX find_library("FOO") returns either libFOO.a(libFOO.so) or libFOO.so
-while legacy names e.g., find_library("c") returns libc.a(shr.o)
-or libc.a(shr_64.o) - depending on 32 or 64-bit operations.
-Include RTLD_MEMBER to mode to support AIX legacy library(member) names
-(Modules/_ctype/posixmodule.c), ctypes/__init__.py and configure.ac)

Misc/NEWS.d/next/Library/2017-11-26-17-28-26.bpo-32143.o7YdXL.rst

-os.statvfs() includes the f_fsid field from statvfs(2)

Misc/NEWS.d/next/Library/2017-12-04-12-23-26.bpo-32199.nGof4v.rst

-The getnode() ip getter now uses 'ip link' instead of 'ip link list'.

Misc/NEWS.d/next/Library/2017-12-04-17-41-40.bpo-15873.-T4TRK.rst

-Added new alternate constructors :meth:`datetime.datetime.fromisoformat`,
-:meth:`datetime.time.fromisoformat` and :meth:`datetime.date.fromisoformat`
-as the inverse operation of each classes's respective ``isoformat`` methods.

Misc/NEWS.d/next/Library/2017-12-05-13-25-15.bpo-32227.3vnWFS.rst

-``functools.singledispatch`` now supports registering implementations using
-type annotations.

Misc/NEWS.d/next/Library/2017-12-07-13-14-40.bpo-32206.obm4OM.rst

-Add support to run modules with pdb

Misc/NEWS.d/next/Library/2017-12-08-11-02-26.bpo-32193.NJe_TQ.rst

-Convert asyncio to use *async/await* syntax. Old styled ``yield from`` is
-still supported too.

Misc/NEWS.d/next/Library/2017-12-08-15-09-41.bpo-22589.8ouqI6.rst

-Changed MIME type of .bmp from 'image/x-ms-bmp' to 'image/bmp'

Misc/NEWS.d/next/Library/2017-12-09-11-30-35.bpo-32253.TQHSYF.rst

-Deprecate ``yield from lock``, ``await lock``, ``with (yield from lock)``
-and ``with await lock`` for asyncio synchronization primitives.

Misc/NEWS.d/next/Library/2017-12-10-00-57-51.bpo-32265.kELtTE.rst

-All class and static methods of builtin types now are correctly classified
-by inspect.classify_class_attrs() and grouped in pydoc ouput. Added
-types.ClassMethodDescriptorType for unbound class methods of builtin types.

Misc/NEWS.d/next/Library/2017-12-10-12-30-13.bpo-32269.Q85pKj.rst

-Add asyncio.get_running_loop() function.

Misc/NEWS.d/next/Library/2017-12-10-18-59-13.bpo-32272.Mu84Am.rst

-Remove asyncio.async() function.

Misc/NEWS.d/next/Library/2017-12-10-19-14-55.bpo-32273.5KKlCv.rst

-Move asyncio.test_utils to test.test_asyncio.

Misc/NEWS.d/next/Library/2017-12-10-21-19-14.bpo-29137.CFcON1.rst

-The ``fpectl`` library has been removed. It was never enabled by default,
-never worked correctly on x86-64, and it changed the Python ABI in ways that
-caused unexpected breakage of C extensions.

Misc/NEWS.d/next/Library/2017-12-10-23-44-56.bpo-30050.4SZ3lY.rst

-New argument warn_on_full_buffer to signal.set_wakeup_fd lets you control
-whether Python prints a warning on stderr when the wakeup fd buffer
-overflows.

Misc/NEWS.d/next/Library/2017-12-11-09-53-14.bpo-32277.jkKiVC.rst

-Raise ``NotImplementedError`` instead of ``SystemError`` on platforms where
-``chmod(..., follow_symlinks=False)`` is not supported.  Patch by Anthony
-Sottile.

Misc/NEWS.d/next/Library/2017-12-12-07-29-06.bpo-32255.2bfNmM.rst

-A single empty field is now always quoted when written into a CSV file.
-This allows to distinguish an empty row from a row consisting of a single empty field.
-Patch by Licht Takeuchi.

Misc/NEWS.d/next/Library/2017-12-12-16-58-20.bpo-32250.UljTa0.rst

-Implement ``asyncio.current_task()`` and ``asyncio.all_tasks()``. Add
-helpers intended to be used by alternative task implementations:
-``asyncio._register_task``, ``asyncio._enter_task``, ``asyncio._leave_task``
-and ``asyncio._unregister_task``. Deprecate ``asyncio.Task.current_task()``
-and ``asyncio.Task.all_tasks()``.

Misc/NEWS.d/next/Library/2017-12-12-18-01-01.bpo-32296.bwscHz.rst

-Implement asyncio._get_running_loop() and get_event_loop() in C. This makes
-them 4x faster.

Misc/NEWS.d/next/Library/2017-12-13-00-00-37.bpo-17852.Q8BP8N.rst

-Revert incorrect fix based on misunderstanding of _Py_PyAtExit() semantics.

Misc/NEWS.d/next/Library/2017-12-13-16-47-38.bpo-32314.W4_U2j.rst

-Implement asyncio.run().

Misc/NEWS.d/next/Library/2017-12-13-19-02-38.bpo-29970.uxVOpk.rst

-Abort asyncio SSLProtocol connection if handshake not complete within 10s

Misc/NEWS.d/next/Library/2017-12-13-20-31-30.bpo-32308.CUbsb2.rst

-:func:`re.sub()` now replaces empty matches adjacent to a previous non-empty
-match.

Misc/NEWS.d/next/Library/2017-12-13-22-10-36.bpo-29711.hJjghA.rst

-Fix ``stop_serving`` in asyncio proactor loop kill all listening servers

Misc/NEWS.d/next/Library/2017-12-13-22-38-08.bpo-32302.othtTr.rst

-Fix bdist_wininst of distutils for CRT v142: it binary compatible with CRT
-v140.

Misc/NEWS.d/next/Library/2017-12-14-10-10-10.bpo-32323.ideco.rst

-:func:`urllib.parse.urlsplit()` does not convert zone-id (scope) to lower case
-for scoped IPv6 addresses in hostnames now.

Misc/NEWS.d/next/Library/2017-12-14-16-00-25.bpo-32327.bbkSxA.rst

-Convert asyncio functions that were documented as coroutines to coroutines.
-Affected functions: loop.sock_sendall, loop.sock_recv, loop.sock_accept,
-loop.run_in_executor, loop.getaddrinfo, loop.getnameinfo.

Misc/NEWS.d/next/Library/2017-12-14-17-28-54.bpo-32311.DL5Ytn.rst

-Implement asyncio.create_task(coro) shortcut

Misc/NEWS.d/next/Library/2017-12-15-15-34-12.bpo-32248.zmO8G2.rst

-Add :class:`importlib.abc.ResourceReader` as an ABC for loaders to provide a
-unified API for reading resources contained within packages.  Also add
-:mod:`importlib.resources` as the port of ``importlib_resources``.

Misc/NEWS.d/next/Library/2017-12-15-23-48-43.bpo-32331.fIg1Uc.rst

-Fix socket.settimeout() and socket.setblocking() to keep socket.type
-as is. Fix socket.socket() constructor to reset any bit flags applied to
-socket's type.  This change only affects OSes that have SOCK_NONBLOCK
-and/or SOCK_CLOEXEC.

Misc/NEWS.d/next/Library/2017-12-16-18-50-57.bpo-32348.5j__he.rst

-Optimize asyncio.Future schedule/add/remove callback.  The optimization
-shows 3-6% performance improvements of async/await code.

Misc/NEWS.d/next/Library/2017-12-17-14-23-23.bpo-32351.95fh2K.rst

-Use fastpath in asyncio.sleep if delay<0 (2x boost)

Misc/NEWS.d/next/Library/2017-12-17-21-42-24.bpo-32355.tbaTWA.rst

-Optimize asyncio.gather(); now up to 15% faster.

Misc/NEWS.d/next/Library/2017-12-17-22-50-51.bpo-32356.roZJpA.rst

-asyncio.transport.resume_reading() and pause_reading() are now idempotent.
-New transport.is_reading() method is added.

Misc/NEWS.d/next/Library/2017-12-18-00-36-41.bpo-32357.t1F3sn.rst

-Optimize asyncio.iscoroutine() and loop.create_task() for non-native
-coroutines (e.g. async/await compiled with Cython).
-
-'loop.create_task(python_coroutine)' used to be 20% faster than
-'loop.create_task(cython_coroutine)'.  Now, the latter is as fast.

Misc/NEWS.d/next/Library/2017-12-19-00-37-28.bpo-32363.YTeGU0.rst

-Make asyncio.Task.set_exception() and set_result() raise
-NotImplementedError. Task._step() and Future.__await__() raise proper
-exceptions when they are in an invalid state, instead of raising an
-AssertionError.

Misc/NEWS.d/next/Library/2017-12-21-11-08-42.bpo-26133.mt81QV.rst

-Don't unsubscribe signals in asyncio UNIX event loop on interpreter shutdown.

Misc/NEWS.d/next/Library/2017-12-23-12-45-00.bpo-32415.YufXTU.rst

-asyncio: Add Task.get_loop() and Future.get_loop()

Misc/NEWS.d/next/Library/2017-12-25-11-09-46.bpo-31721.5gM972.rst

-Prevent Python crash from happening when Future._log_traceback is set to
-True manually.  Now it can only be set to False, or a ValueError is raised.

Misc/NEWS.d/next/Library/2017-12-25-20-22-47.bpo-32422.5H3Wq2.rst

-``functools.lru_cache`` uses less memory (3 words for each cached key) and
-takes about 1/3 time for cyclic GC.

Misc/NEWS.d/next/Library/2017-12-28-21-30-40.bpo-32441.LqlboJ.rst

-Return the new file descriptor (i.e., the second argument) from ``os.dup2``.
-Previously, ``None`` was always returned.

Misc/NEWS.d/next/Library/2017-12-29-00-44-42.bpo-23749.QL1Cxd.rst

-asyncio: Implement loop.start_tls()

Misc/NEWS.d/next/Library/2017-12-31-20-32-58.bpo-32468.YBs__0.rst

-Improve frame repr() to mention filename, code name and current line number.

Misc/NEWS.d/next/Library/2018-01-06-10-54-16.bpo-32499.koyY-4.rst

-Add dataclasses.is_dataclass(obj), which returns True if obj is a dataclass
-or an instance of one.

Misc/NEWS.d/next/Library/2018-01-06-15-15-34.bpo-32278.bGnGc0.rst

-Make type information optional on dataclasses.make_dataclass(). If omitted,
-the string 'typing.Any' is used.

Misc/NEWS.d/next/Library/2018-01-06-16-50-11.bpo-32279.1xOpU8.rst

-Add params to dataclasses.make_dataclasses(): init, repr, eq, order, hash,
-and frozen.  Pass them through to dataclass().

Misc/NEWS.d/next/Library/2018-01-07-11-32-42.bpo-32506.MaT-zU.rst

-Now that dict is defined as keeping insertion order, drop OrderedDict and
-just use plain dict.

Misc/NEWS.d/next/Tests/2017-11-11-16-35-18.bpo-32002.itDxIo.rst

-Adjust C locale coercion testing for the empty locale and POSIX locale
-cases to more readily adjust to platform dependent behaviour.

Misc/NEWS.d/next/Tests/2017-12-11-13-31-33.bpo-32252.YnFw7J.rst

-Fix faulthandler_suppress_crash_report() used to prevent core dump files
-when testing crashes. getrlimit() returns zero on success.

Misc/NEWS.d/next/Tools-Demos/2017-12-22-09-25-51.bpo-24960.TGdAgO.rst

-2to3 and lib2to3 can now read pickled grammar files using pkgutil.get_data()
-rather than probing the filesystem. This lets 2to3 and lib2to3 work when run
-from a zipfile.

Misc/NEWS.d/next/Windows/2017-08-18-18-00-24.bpo-19764.ODpc9y.rst

-Implement support for `subprocess.Popen(close_fds=True)` on Windows. Patch
-by Segev Finer.

README.rst

-This is Python version 3.7.0 alpha 3+
-=====================================
+This is Python version 3.7.0 alpha 4
+====================================
 
 .. image:: https://travis-ci.org/python/cpython.svg?branch=master
    :alt: CPython build status on Travis CI