Misc/NEWS.d/3.8.1rc1.rst - platform/external/python/cpython3 - Git at Google

 .. bpo: 38945
 .. date: 2019-12-01-22-44-40
 .. nonce: ztmNXc
 .. release date: 2019-12-09
 .. section: Security

 Newline characters have been escaped when performing uu encoding to prevent
 them from overflowing into to content section of the encoded file. This
 prevents malicious or accidental modification of data during the decoding
 process.

 ..

 .. bpo: 37228
 .. date: 2019-11-21-21-36-54
 .. nonce: yBZnFG
 .. section: Security

 Due to significant security concerns, the *reuse_address* parameter of
 :meth:`asyncio.loop.create_datagram_endpoint` is no longer supported. This
 is because of the behavior of ``SO_REUSEADDR`` in UDP. For more details, see
 the documentation for ``loop.create_datagram_endpoint()``. (Contributed by
 Kyle Stanley, Antoine Pitrou, and Yury Selivanov in :issue:`37228`.)

 ..

 .. bpo: 38722
 .. date: 2019-11-18-16-17-56
 .. nonce: x3mECW
 .. section: Security

 :mod:`runpy` now uses :meth:`io.open_code` to open code files. Patch by
 Jason Killen.

 ..

 .. bpo: 38804
 .. date: 2019-11-15-00-54-42
 .. nonce: vjbM8V
 .. section: Security

 Fixes a ReDoS vulnerability in :mod:`http.cookiejar`. Patch by Ben Caller.

 ..

 .. bpo: 38622
 .. date: 2019-11-14-16-13-23
 .. nonce: 3DYkfb
 .. section: Security

 Add additional audit events for the :mod:`ctypes` module.

 ..

 .. bpo: 38418
 .. date: 2019-10-08-19-29-55
 .. nonce: QL7s0-
 .. section: Security

 Fixes audit event for :func:`os.system` to be named ``os.system``.

 ..

 .. bpo: 38673
 .. date: 2019-12-01-00-17-44
 .. nonce: K_Tze-
 .. section: Core and Builtins

 In REPL mode, don't switch to PS2 if the line starts with comment or
 whitespace. Based on work by Batuhan Taşkaya.

 ..

 .. bpo: 38922
 .. date: 2019-11-26-12-20-34
 .. nonce: i6ja-i
 .. section: Core and Builtins

 Calling ``replace`` on a code object now raises the ``code.__new__`` audit
 event.

 ..

 .. bpo: 38920
 .. date: 2019-11-26-09-16-47
 .. nonce: Vx__sT
 .. section: Core and Builtins

 Add audit hooks for when :func:`sys.excepthook` and
 :func:`sys.unraisablehook` are invoked

 ..

 .. bpo: 38892
 .. date: 2019-11-22-22-18-50
 .. nonce: LS586s
 .. section: Core and Builtins

 Improve documentation for audit events table and functions.

 ..

 .. bpo: 38707
 .. date: 2019-11-08-00-36-10
 .. nonce: SZL036
 .. section: Core and Builtins

 ``MainThread.native_id`` is now correctly reset in child processes spawned
 using :class:`multiprocessing.Process`, instead of retaining the parent's
 value.

 ..

 .. bpo: 38640
 .. date: 2019-10-30-11-25-25
 .. nonce: 4sAFh5
 .. section: Core and Builtins

 Fixed a bug in the compiler that was causing to raise in the presence of
 break statements and continue statements inside always false while loops.
 Patch by Pablo Galindo.

 ..

 .. bpo: 38535
 .. date: 2019-10-20-12-43-48
 .. nonce: ESMkVN
 .. section: Core and Builtins

 Fixed line numbers and column offsets for AST nodes for calls without
 arguments in decorators.

 ..

 .. bpo: 38525
 .. date: 2019-10-20-00-36-18
 .. nonce: Vty1cA
 .. section: Core and Builtins

 Fix a segmentation fault when using reverse iterators of empty ``dict``
 objects. Patch by Dong-hee Na and Inada Naoki.

 ..

 .. bpo: 35409
 .. date: 2019-07-13-18-01-13
 .. nonce: ozbcsR
 .. section: Core and Builtins

 Ignore GeneratorExit exceptions when throwing an exception into the aclose
 coroutine of an asynchronous generator.

 ..

 .. bpo: 39006
 .. date: 2019-12-09-14-40-09
 .. nonce: v4VsPg
 .. section: Library

 Fix asyncio when the ssl module is missing: only check for ssl.SSLSocket
 instance if the ssl module is available.

 ..

 .. bpo: 38708
 .. date: 2019-12-07-22-25-39
 .. nonce: rZTUfk
 .. section: Library

 Fix a potential IndexError in email parser when parsing an empty msg-id.

 ..

 .. bpo: 38698
 .. date: 2019-12-07-21-49-50
 .. nonce: HxoSym
 .. section: Library

 Add a new ``InvalidMessageID`` token to email parser to represent invalid
 Message-ID headers.  Also, add defects when there is remaining value after
 parsing the header.

 ..

 .. bpo: 38979
 .. date: 2019-12-07-16-32-42
 .. nonce: q0sIHy
 .. section: Library

 Return class from ``ContextVar.__class_getitem__`` to simplify subclassing.

 ..

 .. bpo: 38986
 .. date: 2019-12-06-15-11-42
 .. nonce: bg6iZt
 .. section: Library

 Make repr of C accelerated TaskWakeupMethWrapper the same as of pure Python
 version.

 ..

 .. bpo: 38529
 .. date: 2019-12-05-16-13-25
 .. nonce: yvQgx3
 .. section: Library

 Drop too noisy asyncio warning about deletion of a stream without explicit
 ``.close()`` call.

 ..

 .. bpo: 38634
 .. date: 2019-12-04-15-56-28
 .. nonce: pq0ZWa
 .. section: Library

 The :mod:`readline` module now detects if Python is linked to libedit at
 runtime on all platforms.  Previously, the check was only done on macOS.

 ..

 .. bpo: 33684
 .. date: 2019-12-04-15-28-40
 .. nonce: QeSmQP
 .. section: Library

 Fix ``json.tool`` failed to read a JSON file with non-ASCII characters when
 locale encoding is not UTF-8.

 ..

 .. bpo: 38698
 .. date: 2019-12-02-10-35-19
 .. nonce: WZnAPQ
 .. section: Library

 Prevent UnboundLocalError to pop up in parse_message_id

 parse_message_id() was improperly using a token defined inside an exception
 handler, which was raising `UnboundLocalError` on parsing an invalid value.
 Patch by Claudiu Popa.

 ..

 .. bpo: 26730
 .. date: 2019-11-27-16-30-02
 .. nonce: 56cdBn
 .. section: Library

 Fix ``SpooledTemporaryFile.rollover()`` might corrupt the file when it is in
 text mode. Patch by Serhiy Storchaka.

 ..

 .. bpo: 38668
 .. date: 2019-11-22-10-45-03
 .. nonce: iKx23z
 .. section: Library

 Calling func:`shutil.copytree` to copy a directory tree from one directory
 to another subdirectory resulted in an endless loop and a RecursionError. A
 fix was added to consume an iterator and create the list of the entries to
 be copied, avoiding the recursion for newly created directories. Patch by
 Bruno P. Kinoshita.

 ..

 .. bpo: 37838
 .. date: 2019-11-21-11-39-17
 .. nonce: lRFcEC
 .. section: Library

 :meth:`typing.get_type_hints` properly handles functions decorated with
 :meth:`functools.wraps`.

 ..

 .. bpo: 38859
 .. date: 2019-11-19-16-30-46
 .. nonce: AZUzL8
 .. section: Library

 AsyncMock now returns StopAsyncIteration on the exaustion of a side_effects
 iterable. Since PEP-479 its Impossible to raise a StopIteration exception
 from a coroutine.

 ..

 .. bpo: 38857
 .. date: 2019-11-19-16-28-25
 .. nonce: YPUkU9
 .. section: Library

 AsyncMock fix for return values that are awaitable types.  This also covers
 side_effect iterable values that happend to be awaitable, and wraps
 callables that return an awaitable type. Before these awaitables were being
 awaited instead of being returned as is.

 ..

 .. bpo: 38821
 .. date: 2019-11-16-23-26-25
 .. nonce: -albNN
 .. section: Library

 Fix unhandled exceptions in :mod:`argparse` when internationalizing error
 messages for arguments with ``nargs`` set to special (non-integer) values.
 Patch by Federico Bond.

 ..

 .. bpo: 38820
 .. date: 2019-11-16-16-09-07
 .. nonce: ivhUSV
 .. section: Library

 Make Python compatible with OpenSSL 3.0.0. :func:`ssl.SSLSocket.getpeercert`
 no longer returns IPv6 addresses with a trailing new line.

 ..

 .. bpo: 38807
 .. date: 2019-11-15-09-30-29
 .. nonce: PsmRog
 .. section: Library

 Update :exc:`TypeError` messages for :meth:`os.path.join` to include
 :class:`os.PathLike` objects as acceptable input types.

 ..

 .. bpo: 38785
 .. date: 2019-11-13-16-17-43
 .. nonce: NEOEfk
 .. section: Library

 Prevent asyncio from crashing if parent ``__init__`` is not called from a
 constructor of object derived from ``asyncio.Future``.

 ..

 .. bpo: 38723
 .. date: 2019-11-12-15-46-28
 .. nonce: gcdMFn
 .. section: Library

 :mod:`pdb` now uses :meth:`io.open_code` to trigger auditing events.

 ..

 .. bpo: 27805
 .. date: 2019-11-11-21-43-06
 .. nonce: D3zl1_
 .. section: Library

 Allow opening pipes and other non-seekable files in append mode with
 :func:`open`.

 ..

 .. bpo: 38686
 .. date: 2019-11-06-15-26-15
 .. nonce: HNFBce
 .. section: Library

 Added support for multiple ``qop`` values in
 :class:`urllib.request.AbstractDigestAuthHandler`.

 ..

 .. bpo: 38334
 .. date: 2019-10-27-00-08-49
 .. nonce: pfLLmc
 .. section: Library

 Fixed seeking backward on an encrypted :class:`zipfile.ZipExtFile`.

 ..

 .. bpo: 34679
 .. date: 2019-10-23-16-25-12
 .. nonce: Bnw8o3
 .. section: Library

 asynci.ProactorEventLoop.close() now only calls signal.set_wakeup_fd() in
 the main thread.

 ..

 .. bpo: 31202
 .. date: 2019-10-20-12-04-48
 .. nonce: NfdIus
 .. section: Library

 The case the result of :func:`pathlib.WindowsPath.glob` matches now the case
 of the pattern for literal parts.

 ..

 .. bpo: 38521
 .. date: 2019-10-18-13-57-31
 .. nonce: U-7aaM
 .. section: Library

 Fixed erroneous equality comparison in statistics.NormalDist().

 ..

 .. bpo: 38478
 .. date: 2019-10-15-11-37-57
 .. nonce: A87OPO
 .. section: Library

 Fixed a bug in :meth:`inspect.signature.bind` that was causing it to fail
 when handling a keyword argument with same name as positional-only
 parameter. Patch by Pablo Galindo.

 ..

 .. bpo: 33604
 .. date: 2019-10-15-09-47-40
 .. nonce: J12cWT
 .. section: Library

 Fixed `hmac.new` and `hmac.HMAC` to raise TypeError instead of ValueError
 when the digestmod parameter, now required in 3.8, is omitted.  Also
 clarified the hmac module documentation and docstrings.

 ..

 .. bpo: 38422
 .. date: 2019-10-09-18-16-51
 .. nonce: aiM5bq
 .. section: Library

 Clarify docstrings of pathlib suffix(es)

 ..

 .. bpo: 36993
 .. date: 2019-07-09-05-44-39
 .. nonce: 4javqu
 .. section: Library

 Improve error reporting for corrupt zip files with bad zip64 extra data.
 Patch by Daniel Hillier.

 ..

 .. bpo: 36820
 .. date: 2019-05-06-15-34-17
 .. nonce: Eh5mIB
 .. section: Library

 Break cycle generated when saving an exception in socket.py, codeop.py and
 dyld.py as they keep alive not only the exception but user objects through
 the ``__traceback__`` attribute. Patch by Mario Corchero.

 ..

 .. bpo: 34776
 .. date: 2018-09-23-14-24-37
 .. nonce: 1SrQe3
 .. section: Library

 Fix dataclasses to support forward references in type annotations

 ..

 .. bpo: 33348
 .. date: 2018-04-24-13-18-48
 .. nonce: XaJDei
 .. section: Library

 lib2to3 now recognizes expressions after ``*`` and `**` like in ``f(*[] or
 [])``.

 ..

 .. bpo: 27657
 .. date: 2017-12-26-14-32-23
 .. nonce: 6BhyVK
 .. section: Library

 Fix urllib.parse.urlparse() with numeric paths. A string like "path:80" is
 no longer parsed as a path but as a scheme ("path") and a path ("80").

 ..

 .. bpo: 38816
 .. date: 2019-11-15-11-39-13
 .. nonce: vUaSVL
 .. section: Documentation

 Provides more details about the interaction between :c:func:`fork` and
 CPython's runtime, focusing just on the C-API.  This includes cautions about
 where :c:func:`fork` should and shouldn't be called.

 ..

 .. bpo: 38351
 .. date: 2019-11-15-09-22-28
 .. nonce: xwhlse
 .. section: Documentation

 Modernize :mod:`email` examples from %-formatting to f-strings.

 ..

 .. bpo: 38778
 .. date: 2019-11-12-15-31-09
 .. nonce: PHhTlv
 .. section: Documentation

 Document the fact that :exc:`RuntimeError` is raised if :meth:`os.fork` is
 called in a subinterpreter.

 ..

 .. bpo: 38592
 .. date: 2019-10-26-13-19-07
 .. nonce: Y96BYO
 .. section: Documentation

 Add Brazilian Portuguese to the language switcher at Python Documentation
 website.

 ..

 .. bpo: 38547
 .. date: 2019-12-09-11-32-34
 .. nonce: Juw54e
 .. section: Tests

 Fix test_pty: if the process is the session leader, closing the master file
 descriptor raises a SIGHUP signal: simply ignore SIGHUP when running the
 tests.

 ..

 .. bpo: 38992
 .. date: 2019-12-08-15-11-06
 .. nonce: cVoHOZ
 .. section: Tests

 Fix a test for :func:`math.fsum` that was failing due to constant folding.

 ..

 .. bpo: 38965
 .. date: 2019-12-04-17-08-55
 .. nonce: yqax3m
 .. section: Tests

 Fix test_faulthandler on GCC 10. Use the "volatile" keyword in
 ``faulthandler._stack_overflow()`` to prevent tail call optimization on any
 compiler, rather than relying on compiler specific pragma.

 ..

 .. bpo: 38875
 .. date: 2019-11-21-09-11-06
 .. nonce: wSZJal
 .. section: Tests

 test_capi: trashcan tests now require the test "cpu" resource.

 ..

 .. bpo: 38841
 .. date: 2019-11-20-16-08-19
 .. nonce: 5F5Lbw
 .. section: Tests

 Skip asyncio test_create_datagram_endpoint_existing_sock_unix on platforms
 lacking a functional bind() for named unix domain sockets.

 ..

 .. bpo: 38669
 .. date: 2019-11-04-02-54-16
 .. nonce: pazXZ8
 .. section: Tests

 Raise :exc:`TypeError` when passing target as a string with
 :meth:`unittest.mock.patch.object`.

 ..

 .. bpo: 35998
 .. date: 2019-10-16-01-36-15
 .. nonce: G305Bf
 .. section: Tests

 Fix a race condition in test_asyncio.test_start_tls_server_1(). Previously,
 there was a race condition between the test main() function which replaces
 the protocol and the test ServerProto protocol which sends ANSWER once it
 gets HELLO. Now, only the test main() function is responsible to send data,
 ServerProto no longer sends data.

 ..

 .. bpo: 37404
 .. date: 2019-12-01-21-45-24
 .. nonce: cNsA7S
 .. section: Build

 :mod:`asyncio` now raises :exc:`TyperError` when calling incompatible
 methods with an :class:`ssl.SSLSocket` socket.  Patch by Ido Michael.

 ..

 .. bpo: 38809
 .. date: 2019-11-15-09-25-44
 .. nonce: 9jwta6
 .. section: Build

 On Windows, build scripts will now recognize and use python.exe from an
 active virtual env.

 ..

 .. bpo: 38684
 .. date: 2019-11-04-14-30-37
 .. nonce: aed593
 .. section: Build

 Fix _hashlib build when Blake2 is disabled, but OpenSSL supports it.

 ..

 .. bpo: 37415
 .. date: 2019-10-11-15-32-58
 .. nonce: D9RXrq
 .. section: Build

 Fix stdatomic.h header check for ICC compiler: the ICC implementation lacks
 atomic_uintptr_t type which is needed by Python.

 ..

 .. bpo: 33125
 .. date: 2019-11-14-08-57-50
 .. nonce: EN5MWS
 .. section: Windows

 Add support for building and releasing Windows ARM64 packages.

 ..

 .. bpo: 38589
 .. date: 2019-10-28-10-48-16
 .. nonce: V69Q1a
 .. section: Windows

 Fixes HTML Help shortcut when Windows is not installed to C drive

 ..

 .. bpo: 38453
 .. date: 2019-10-28-10-32-43
 .. nonce: NwwatW
 .. section: Windows

 Ensure ntpath.realpath() correctly resolves relative paths.

 ..

 .. bpo: 38519
 .. date: 2019-10-28-05-01-29
 .. nonce: dCkY66
 .. section: Windows

 Restores the internal C headers that were missing from the nuget.org and
 Microsoft Store packages.

 ..

 .. bpo: 38492
 .. date: 2019-10-16-09-49-09
 .. nonce: Te1LxC
 .. section: Windows

 Remove ``pythonw.exe`` dependency on the Microsoft C++ runtime.

 ..

 .. bpo: 37931
 .. date: 2019-08-23-12-14-34
 .. nonce: goYgQj
 .. section: macOS

 Fixed a crash on OSX dynamic builds that occurred when re-initializing the
 posix module after a Py_Finalize if the environment had changed since the
 previous `import posix`. Patch by Benoît Hudson.

 ..

 .. bpo: 38862
 .. date: 2019-11-23-21-50-57
 .. nonce: KQ9A0m
 .. section: IDLE

 'Strip Trailing Whitespace' on the Format menu removes extra newlines at the
 end of non-shell files.

 ..

 .. bpo: 26353
 .. date: 2019-11-09-23-55-59
 .. nonce: duYZiF
 .. section: IDLE

 Stop adding newline when saving an IDLE shell window.

 ..

 .. bpo: 38636
 .. date: 2019-10-30-22-11-16
 .. nonce: hUhDeB
 .. section: IDLE

 Fix IDLE Format menu tab toggle and file indent width. These functions
 (default shortcuts Alt-T and Alt-U) were mistakenly disabled in 3.7.5 and
 3.8.0.

 ..

 .. bpo: 4630
 .. date: 2019-10-28-04-48-03
 .. nonce: upgjiV
 .. section: IDLE

 Add an option to toggle IDLE's cursor blink for shell, editor, and output
 windows.  See Settings, General, Window Preferences, Cursor Blink. Patch by
 Zachary Spytz.

 ..

 .. bpo: 38598
 .. date: 2019-10-26-18-16-24
 .. nonce: 6kH9FY
 .. section: IDLE

 Do not try to compile IDLE shell or output windows

 ..

 .. bpo: 37633
 .. date: 2019-11-04-21-10-47
 .. nonce: oOGVdo
 .. section: C API

 Re-export some function compatibility wrappers for macros in ``pythonrun.h``.

 ..

 .. bpo: 38540
 .. date: 2019-10-21-09-24-03
 .. nonce: 314N_T
 .. section: C API

 Fixed possible leak in :c:func:`PyArg_Parse` and similar functions for
 format units ``"es#"`` and ``"et#"`` when the macro
 :c:macro:`PY_SSIZE_T_CLEAN` is not defined.

 ..

 .. bpo: 36389
 .. date: 2019-10-07-17-15-09
 .. nonce: hFX_jD
 .. section: C API

 The ``_PyObject_CheckConsistency()`` function is now also available in
 release mode. For example, it can be used to debug a crash in the
 ``visit_decref()`` function of the GC.
	.. bpo: 38945
	.. date: 2019-12-01-22-44-40
	.. nonce: ztmNXc
	.. release date: 2019-12-09
	.. section: Security

	Newline characters have been escaped when performing uu encoding to prevent
	them from overflowing into to content section of the encoded file. This
	prevents malicious or accidental modification of data during the decoding
	process.

	..

	.. bpo: 37228
	.. date: 2019-11-21-21-36-54
	.. nonce: yBZnFG
	.. section: Security

	Due to significant security concerns, the reuse_address parameter of
	:meth:`asyncio.loop.create_datagram_endpoint` is no longer supported. This
	is because of the behavior of ``SO_REUSEADDR`` in UDP. For more details, see
	the documentation for ``loop.create_datagram_endpoint()``. (Contributed by
	Kyle Stanley, Antoine Pitrou, and Yury Selivanov in :issue:`37228`.)

	..

	.. bpo: 38722
	.. date: 2019-11-18-16-17-56
	.. nonce: x3mECW
	.. section: Security

	:mod:`runpy` now uses :meth:`io.open_code` to open code files. Patch by
	Jason Killen.

	..

	.. bpo: 38804
	.. date: 2019-11-15-00-54-42
	.. nonce: vjbM8V
	.. section: Security

	Fixes a ReDoS vulnerability in :mod:`http.cookiejar`. Patch by Ben Caller.

	..

	.. bpo: 38622
	.. date: 2019-11-14-16-13-23
	.. nonce: 3DYkfb
	.. section: Security

	Add additional audit events for the :mod:`ctypes` module.

	..

	.. bpo: 38418
	.. date: 2019-10-08-19-29-55
	.. nonce: QL7s0-
	.. section: Security

	Fixes audit event for :func:`os.system` to be named ``os.system``.

	..

	.. bpo: 38673
	.. date: 2019-12-01-00-17-44
	.. nonce: K_Tze-
	.. section: Core and Builtins

	In REPL mode, don't switch to PS2 if the line starts with comment or
	whitespace. Based on work by Batuhan Taşkaya.

	..

	.. bpo: 38922
	.. date: 2019-11-26-12-20-34
	.. nonce: i6ja-i
	.. section: Core and Builtins

	Calling ``replace`` on a code object now raises the ``code.__new__`` audit
	event.

	..

	.. bpo: 38920
	.. date: 2019-11-26-09-16-47
	.. nonce: Vx__sT
	.. section: Core and Builtins

	Add audit hooks for when :func:`sys.excepthook` and
	:func:`sys.unraisablehook` are invoked

	..

	.. bpo: 38892
	.. date: 2019-11-22-22-18-50
	.. nonce: LS586s
	.. section: Core and Builtins

	Improve documentation for audit events table and functions.

	..

	.. bpo: 38707
	.. date: 2019-11-08-00-36-10
	.. nonce: SZL036
	.. section: Core and Builtins

	``MainThread.native_id`` is now correctly reset in child processes spawned
	using :class:`multiprocessing.Process`, instead of retaining the parent's
	value.

	..

	.. bpo: 38640
	.. date: 2019-10-30-11-25-25
	.. nonce: 4sAFh5
	.. section: Core and Builtins

	Fixed a bug in the compiler that was causing to raise in the presence of
	break statements and continue statements inside always false while loops.
	Patch by Pablo Galindo.

	..

	.. bpo: 38535
	.. date: 2019-10-20-12-43-48
	.. nonce: ESMkVN
	.. section: Core and Builtins

	Fixed line numbers and column offsets for AST nodes for calls without
	arguments in decorators.

	..

	.. bpo: 38525
	.. date: 2019-10-20-00-36-18
	.. nonce: Vty1cA
	.. section: Core and Builtins

	Fix a segmentation fault when using reverse iterators of empty ``dict``
	objects. Patch by Dong-hee Na and Inada Naoki.

	..

	.. bpo: 35409
	.. date: 2019-07-13-18-01-13
	.. nonce: ozbcsR
	.. section: Core and Builtins

	Ignore GeneratorExit exceptions when throwing an exception into the aclose
	coroutine of an asynchronous generator.

	..

	.. bpo: 39006
	.. date: 2019-12-09-14-40-09
	.. nonce: v4VsPg
	.. section: Library

	Fix asyncio when the ssl module is missing: only check for ssl.SSLSocket
	instance if the ssl module is available.

	..

	.. bpo: 38708
	.. date: 2019-12-07-22-25-39
	.. nonce: rZTUfk
	.. section: Library

	Fix a potential IndexError in email parser when parsing an empty msg-id.

	..

	.. bpo: 38698
	.. date: 2019-12-07-21-49-50
	.. nonce: HxoSym
	.. section: Library

	Add a new ``InvalidMessageID`` token to email parser to represent invalid
	Message-ID headers. Also, add defects when there is remaining value after
	parsing the header.

	..

	.. bpo: 38979
	.. date: 2019-12-07-16-32-42
	.. nonce: q0sIHy
	.. section: Library

	Return class from ``ContextVar.__class_getitem__`` to simplify subclassing.

	..

	.. bpo: 38986
	.. date: 2019-12-06-15-11-42
	.. nonce: bg6iZt
	.. section: Library

	Make repr of C accelerated TaskWakeupMethWrapper the same as of pure Python
	version.

	..

	.. bpo: 38529
	.. date: 2019-12-05-16-13-25
	.. nonce: yvQgx3
	.. section: Library

	Drop too noisy asyncio warning about deletion of a stream without explicit
	``.close()`` call.

	..

	.. bpo: 38634
	.. date: 2019-12-04-15-56-28
	.. nonce: pq0ZWa
	.. section: Library

	The :mod:`readline` module now detects if Python is linked to libedit at
	runtime on all platforms. Previously, the check was only done on macOS.

	..

	.. bpo: 33684
	.. date: 2019-12-04-15-28-40
	.. nonce: QeSmQP
	.. section: Library

	Fix ``json.tool`` failed to read a JSON file with non-ASCII characters when
	locale encoding is not UTF-8.

	..

	.. bpo: 38698
	.. date: 2019-12-02-10-35-19
	.. nonce: WZnAPQ
	.. section: Library

	Prevent UnboundLocalError to pop up in parse_message_id

	parse_message_id() was improperly using a token defined inside an exception
	handler, which was raising `UnboundLocalError` on parsing an invalid value.
	Patch by Claudiu Popa.

	..

	.. bpo: 26730
	.. date: 2019-11-27-16-30-02
	.. nonce: 56cdBn
	.. section: Library

	Fix ``SpooledTemporaryFile.rollover()`` might corrupt the file when it is in
	text mode. Patch by Serhiy Storchaka.

	..

	.. bpo: 38668
	.. date: 2019-11-22-10-45-03
	.. nonce: iKx23z
	.. section: Library

	Calling func:`shutil.copytree` to copy a directory tree from one directory
	to another subdirectory resulted in an endless loop and a RecursionError. A
	fix was added to consume an iterator and create the list of the entries to
	be copied, avoiding the recursion for newly created directories. Patch by
	Bruno P. Kinoshita.

	..

	.. bpo: 37838
	.. date: 2019-11-21-11-39-17
	.. nonce: lRFcEC
	.. section: Library

	:meth:`typing.get_type_hints` properly handles functions decorated with
	:meth:`functools.wraps`.

	..

	.. bpo: 38859
	.. date: 2019-11-19-16-30-46
	.. nonce: AZUzL8
	.. section: Library

	AsyncMock now returns StopAsyncIteration on the exaustion of a side_effects
	iterable. Since PEP-479 its Impossible to raise a StopIteration exception
	from a coroutine.

	..

	.. bpo: 38857
	.. date: 2019-11-19-16-28-25
	.. nonce: YPUkU9
	.. section: Library

	AsyncMock fix for return values that are awaitable types. This also covers
	side_effect iterable values that happend to be awaitable, and wraps
	callables that return an awaitable type. Before these awaitables were being
	awaited instead of being returned as is.

	..

	.. bpo: 38821
	.. date: 2019-11-16-23-26-25
	.. nonce: -albNN
	.. section: Library

	Fix unhandled exceptions in :mod:`argparse` when internationalizing error
	messages for arguments with ``nargs`` set to special (non-integer) values.
	Patch by Federico Bond.

	..

	.. bpo: 38820
	.. date: 2019-11-16-16-09-07
	.. nonce: ivhUSV
	.. section: Library

	Make Python compatible with OpenSSL 3.0.0. :func:`ssl.SSLSocket.getpeercert`
	no longer returns IPv6 addresses with a trailing new line.

	..

	.. bpo: 38807
	.. date: 2019-11-15-09-30-29
	.. nonce: PsmRog
	.. section: Library

	Update :exc:`TypeError` messages for :meth:`os.path.join` to include
	:class:`os.PathLike` objects as acceptable input types.

	..

	.. bpo: 38785
	.. date: 2019-11-13-16-17-43
	.. nonce: NEOEfk
	.. section: Library

	Prevent asyncio from crashing if parent ``__init__`` is not called from a
	constructor of object derived from ``asyncio.Future``.

	..

	.. bpo: 38723
	.. date: 2019-11-12-15-46-28
	.. nonce: gcdMFn
	.. section: Library

	:mod:`pdb` now uses :meth:`io.open_code` to trigger auditing events.

	..

	.. bpo: 27805
	.. date: 2019-11-11-21-43-06
	.. nonce: D3zl1_
	.. section: Library

	Allow opening pipes and other non-seekable files in append mode with
	:func:`open`.

	..

	.. bpo: 38686
	.. date: 2019-11-06-15-26-15
	.. nonce: HNFBce
	.. section: Library

	Added support for multiple ``qop`` values in
	:class:`urllib.request.AbstractDigestAuthHandler`.

	..

	.. bpo: 38334
	.. date: 2019-10-27-00-08-49
	.. nonce: pfLLmc
	.. section: Library

	Fixed seeking backward on an encrypted :class:`zipfile.ZipExtFile`.

	..

	.. bpo: 34679
	.. date: 2019-10-23-16-25-12
	.. nonce: Bnw8o3
	.. section: Library

	asynci.ProactorEventLoop.close() now only calls signal.set_wakeup_fd() in
	the main thread.

	..

	.. bpo: 31202
	.. date: 2019-10-20-12-04-48
	.. nonce: NfdIus
	.. section: Library

	The case the result of :func:`pathlib.WindowsPath.glob` matches now the case
	of the pattern for literal parts.

	..

	.. bpo: 38521
	.. date: 2019-10-18-13-57-31
	.. nonce: U-7aaM
	.. section: Library

	Fixed erroneous equality comparison in statistics.NormalDist().

	..

	.. bpo: 38478
	.. date: 2019-10-15-11-37-57
	.. nonce: A87OPO
	.. section: Library

	Fixed a bug in :meth:`inspect.signature.bind` that was causing it to fail
	when handling a keyword argument with same name as positional-only
	parameter. Patch by Pablo Galindo.

	..

	.. bpo: 33604
	.. date: 2019-10-15-09-47-40
	.. nonce: J12cWT
	.. section: Library

	Fixed `hmac.new` and `hmac.HMAC` to raise TypeError instead of ValueError
	when the digestmod parameter, now required in 3.8, is omitted. Also
	clarified the hmac module documentation and docstrings.

	..

	.. bpo: 38422
	.. date: 2019-10-09-18-16-51
	.. nonce: aiM5bq
	.. section: Library

	Clarify docstrings of pathlib suffix(es)

	..

	.. bpo: 36993
	.. date: 2019-07-09-05-44-39
	.. nonce: 4javqu
	.. section: Library

	Improve error reporting for corrupt zip files with bad zip64 extra data.
	Patch by Daniel Hillier.

	..

	.. bpo: 36820
	.. date: 2019-05-06-15-34-17
	.. nonce: Eh5mIB
	.. section: Library

	Break cycle generated when saving an exception in socket.py, codeop.py and
	dyld.py as they keep alive not only the exception but user objects through
	the ``__traceback__`` attribute. Patch by Mario Corchero.

	..

	.. bpo: 34776
	.. date: 2018-09-23-14-24-37
	.. nonce: 1SrQe3
	.. section: Library

	Fix dataclasses to support forward references in type annotations

	..

	.. bpo: 33348
	.. date: 2018-04-24-13-18-48
	.. nonce: XaJDei
	.. section: Library

	lib2to3 now recognizes expressions after ```` and `` like in ``f([] or
	[])``.

	..

	.. bpo: 27657
	.. date: 2017-12-26-14-32-23
	.. nonce: 6BhyVK
	.. section: Library

	Fix urllib.parse.urlparse() with numeric paths. A string like "path:80" is
	no longer parsed as a path but as a scheme ("path") and a path ("80").

	..

	.. bpo: 38816
	.. date: 2019-11-15-11-39-13
	.. nonce: vUaSVL
	.. section: Documentation

	Provides more details about the interaction between :c:func:`fork` and
	CPython's runtime, focusing just on the C-API. This includes cautions about
	where :c:func:`fork` should and shouldn't be called.

	..

	.. bpo: 38351
	.. date: 2019-11-15-09-22-28
	.. nonce: xwhlse
	.. section: Documentation

	Modernize :mod:`email` examples from %-formatting to f-strings.

	..

	.. bpo: 38778
	.. date: 2019-11-12-15-31-09
	.. nonce: PHhTlv
	.. section: Documentation

	Document the fact that :exc:`RuntimeError` is raised if :meth:`os.fork` is
	called in a subinterpreter.

	..

	.. bpo: 38592
	.. date: 2019-10-26-13-19-07
	.. nonce: Y96BYO
	.. section: Documentation

	Add Brazilian Portuguese to the language switcher at Python Documentation
	website.

	..

	.. bpo: 38547
	.. date: 2019-12-09-11-32-34
	.. nonce: Juw54e
	.. section: Tests

	Fix test_pty: if the process is the session leader, closing the master file
	descriptor raises a SIGHUP signal: simply ignore SIGHUP when running the
	tests.

	..

	.. bpo: 38992
	.. date: 2019-12-08-15-11-06
	.. nonce: cVoHOZ
	.. section: Tests

	Fix a test for :func:`math.fsum` that was failing due to constant folding.

	..

	.. bpo: 38965
	.. date: 2019-12-04-17-08-55
	.. nonce: yqax3m
	.. section: Tests

	Fix test_faulthandler on GCC 10. Use the "volatile" keyword in
	``faulthandler._stack_overflow()`` to prevent tail call optimization on any
	compiler, rather than relying on compiler specific pragma.

	..

	.. bpo: 38875
	.. date: 2019-11-21-09-11-06
	.. nonce: wSZJal
	.. section: Tests

	test_capi: trashcan tests now require the test "cpu" resource.

	..

	.. bpo: 38841
	.. date: 2019-11-20-16-08-19
	.. nonce: 5F5Lbw
	.. section: Tests

	Skip asyncio test_create_datagram_endpoint_existing_sock_unix on platforms
	lacking a functional bind() for named unix domain sockets.

	..

	.. bpo: 38669
	.. date: 2019-11-04-02-54-16
	.. nonce: pazXZ8
	.. section: Tests

	Raise :exc:`TypeError` when passing target as a string with
	:meth:`unittest.mock.patch.object`.

	..

	.. bpo: 35998
	.. date: 2019-10-16-01-36-15
	.. nonce: G305Bf
	.. section: Tests

	Fix a race condition in test_asyncio.test_start_tls_server_1(). Previously,
	there was a race condition between the test main() function which replaces
	the protocol and the test ServerProto protocol which sends ANSWER once it
	gets HELLO. Now, only the test main() function is responsible to send data,
	ServerProto no longer sends data.

	..

	.. bpo: 37404
	.. date: 2019-12-01-21-45-24
	.. nonce: cNsA7S
	.. section: Build

	:mod:`asyncio` now raises :exc:`TyperError` when calling incompatible
	methods with an :class:`ssl.SSLSocket` socket. Patch by Ido Michael.

	..

	.. bpo: 38809
	.. date: 2019-11-15-09-25-44
	.. nonce: 9jwta6
	.. section: Build

	On Windows, build scripts will now recognize and use python.exe from an
	active virtual env.

	..

	.. bpo: 38684
	.. date: 2019-11-04-14-30-37
	.. nonce: aed593
	.. section: Build

	Fix _hashlib build when Blake2 is disabled, but OpenSSL supports it.

	..

	.. bpo: 37415
	.. date: 2019-10-11-15-32-58
	.. nonce: D9RXrq
	.. section: Build

	Fix stdatomic.h header check for ICC compiler: the ICC implementation lacks
	atomic_uintptr_t type which is needed by Python.

	..

	.. bpo: 33125
	.. date: 2019-11-14-08-57-50
	.. nonce: EN5MWS
	.. section: Windows

	Add support for building and releasing Windows ARM64 packages.

	..

	.. bpo: 38589
	.. date: 2019-10-28-10-48-16
	.. nonce: V69Q1a
	.. section: Windows

	Fixes HTML Help shortcut when Windows is not installed to C drive

	..

	.. bpo: 38453
	.. date: 2019-10-28-10-32-43
	.. nonce: NwwatW
	.. section: Windows

	Ensure ntpath.realpath() correctly resolves relative paths.

	..

	.. bpo: 38519
	.. date: 2019-10-28-05-01-29
	.. nonce: dCkY66
	.. section: Windows

	Restores the internal C headers that were missing from the nuget.org and
	Microsoft Store packages.

	..

	.. bpo: 38492
	.. date: 2019-10-16-09-49-09
	.. nonce: Te1LxC
	.. section: Windows

	Remove ``pythonw.exe`` dependency on the Microsoft C++ runtime.

	..

	.. bpo: 37931
	.. date: 2019-08-23-12-14-34
	.. nonce: goYgQj
	.. section: macOS

	Fixed a crash on OSX dynamic builds that occurred when re-initializing the
	posix module after a Py_Finalize if the environment had changed since the
	previous `import posix`. Patch by Benoît Hudson.

	..

	.. bpo: 38862
	.. date: 2019-11-23-21-50-57
	.. nonce: KQ9A0m
	.. section: IDLE

	'Strip Trailing Whitespace' on the Format menu removes extra newlines at the
	end of non-shell files.

	..

	.. bpo: 26353
	.. date: 2019-11-09-23-55-59
	.. nonce: duYZiF
	.. section: IDLE

	Stop adding newline when saving an IDLE shell window.

	..

	.. bpo: 38636
	.. date: 2019-10-30-22-11-16
	.. nonce: hUhDeB
	.. section: IDLE

	Fix IDLE Format menu tab toggle and file indent width. These functions
	(default shortcuts Alt-T and Alt-U) were mistakenly disabled in 3.7.5 and
	3.8.0.

	..

	.. bpo: 4630
	.. date: 2019-10-28-04-48-03
	.. nonce: upgjiV
	.. section: IDLE

	Add an option to toggle IDLE's cursor blink for shell, editor, and output
	windows. See Settings, General, Window Preferences, Cursor Blink. Patch by
	Zachary Spytz.

	..

	.. bpo: 38598
	.. date: 2019-10-26-18-16-24
	.. nonce: 6kH9FY
	.. section: IDLE

	Do not try to compile IDLE shell or output windows

	..

	.. bpo: 37633
	.. date: 2019-11-04-21-10-47
	.. nonce: oOGVdo
	.. section: C API

	Re-export some function compatibility wrappers for macros in ``pythonrun.h``.

	..

	.. bpo: 38540
	.. date: 2019-10-21-09-24-03
	.. nonce: 314N_T
	.. section: C API

	Fixed possible leak in :c:func:`PyArg_Parse` and similar functions for
	format units ``"es#"`` and ``"et#"`` when the macro
	:c:macro:`PY_SSIZE_T_CLEAN` is not defined.

	..

	.. bpo: 36389
	.. date: 2019-10-07-17-15-09
	.. nonce: hFX_jD
	.. section: C API

	The ``_PyObject_CheckConsistency()`` function is now also available in
	release mode. For example, it can be used to debug a crash in the
	``visit_decref()`` function of the GC.