.. bpo: 40791
.. date: 2020-05-28-06-06-47
.. nonce: QGZClX
.. release date: 2020-12-07
.. section: Security
Add ``volatile`` to the accumulator variable in ``hmac.compare_digest``,
making constant-time-defeating optimizations less likely.
..
.. bpo: 42576
.. date: 2020-12-05-22-34-47
.. nonce: lEeEl7
.. section: Core and Builtins
``types.GenericAlias`` will now raise a ``TypeError`` when attempting to
initialize with a keyword argument. Previously, this would cause the
interpreter to crash if the interpreter was compiled with debug symbols.
This does not affect interpreters compiled for release. Patch by Ken Jin.
..
.. bpo: 42536
.. date: 2020-12-02-20-23-31
.. nonce: Kx3ZOu
.. section: Core and Builtins
Several built-in and standard library types now ensure that their internal
result tuples are always tracked by the :term:`garbage collector <garbage
collection>`:
- :meth:`collections.OrderedDict.items() <collections.OrderedDict>`
- :meth:`dict.items`
- :func:`enumerate`
- :func:`functools.reduce`
- :func:`itertools.combinations`
- :func:`itertools.combinations_with_replacement`
- :func:`itertools.permutations`
- :func:`itertools.product`
- :func:`itertools.zip_longest`
- :func:`zip`
Previously, they could have become untracked by a prior garbage collection.
Patch by Brandt Bucher.
..
.. bpo: 42500
.. date: 2020-11-30-14-27-29
.. nonce: excVKU
.. section: Core and Builtins
Improve handling of exceptions near recursion limit. Converts a number of
Fatal Errors in RecursionErrors.
..
.. bpo: 42246
.. date: 2020-11-24-14-01-43
.. nonce: c9k9hj
.. section: Core and Builtins
PEP 626: After a return, the f_lineno attribute of a frame is always the
last line executed.
..
.. bpo: 42435
.. date: 2020-11-22-14-34-55
.. nonce: uwlB2W
.. section: Core and Builtins
Speed up comparison of bytes objects with non-bytes objects when option
:option:`-b` is specified. Speed up comparison of bytarray objects with
non-buffer object.
..
.. bpo: 1635741
.. date: 2020-11-18-23-46-31
.. nonce: GVOQ-m
.. section: Core and Builtins
Port the ``_warnings`` extension module to the multi-phase initialization
API (:pep:`489`). Patch by Victor Stinner.
..
.. bpo: 41686
.. date: 2020-11-17-16-25-50
.. nonce: hX77kL
.. section: Core and Builtins
On Windows, the ``SIGINT`` event, ``_PyOS_SigintEvent()``, is now created
even if Python is configured to not install signal handlers (if
:c:member:`PyConfig.install_signal_handlers` equals to 0, or
``Py_InitializeEx(0)``).
..
.. bpo: 42381
.. date: 2020-11-16-23-45-56
.. nonce: G4AWxL
.. section: Core and Builtins
Allow assignment expressions in set literals and set comprehensions as per
PEP 572. Patch by Pablo Galindo.
..
.. bpo: 42202
.. date: 2020-11-16-18-13-07
.. nonce: ZxenYD
.. section: Core and Builtins
Change function parameters annotations internal representation to tuple of
strings. Patch provided by Yurii Karabas.
..
.. bpo: 42374
.. date: 2020-11-16-17-57-09
.. nonce: t7np1E
.. section: Core and Builtins
Fix a regression introduced by the new parser, where an unparenthesized
walrus operator was not allowed within generator expressions.
..
.. bpo: 42316
.. date: 2020-11-16-17-30-03
.. nonce: _DdmpQ
.. section: Core and Builtins
Allow an unparenthesized walrus in subscript indexes.
..
.. bpo: 42349
.. date: 2020-11-13-17-25-44
.. nonce: JdWxez
.. section: Core and Builtins
Make sure that the compiler front-end produces a well-formed control flow
graph. Be more aggressive in the compiler back-end, as it is now safe to
do so.
..
.. bpo: 42296
.. date: 2020-11-13-13-53-11
.. nonce: DuGrLJ
.. section: Core and Builtins
On Windows, fix a regression in signal handling which prevented to interrupt
a program using CTRL+C. The signal handler can be run in a thread different
than the Python thread, in which case the test deciding if the thread can
handle signals is wrong.
..
.. bpo: 42332
.. date: 2020-11-12-23-16-14
.. nonce: fEQIdk
.. section: Core and Builtins
:class:`types.GenericAlias` objects can now be the targets of weakrefs.
..
.. bpo: 42282
.. date: 2020-11-07-21-02-05
.. nonce: M1W4Wj
.. section: Core and Builtins
Optimise constant subexpressions that appear as part of named expressions
(previously the AST optimiser did not descend into named expressions). Patch
by Nick Coghlan.
..
.. bpo: 42266
.. date: 2020-11-04-23-03-25
.. nonce: G4hGDe
.. section: Core and Builtins
Fixed a bug with the LOAD_ATTR opcode cache that was not respecting
monkey-patching a class-level attribute to make it a descriptor. Patch by
Pablo Galindo.
..
.. bpo: 40077
.. date: 2020-11-03-21-58-27
.. nonce: a9qM1j
.. section: Core and Builtins
Convert :mod:`queue` to use heap types.
..
.. bpo: 42246
.. date: 2020-11-02-15-48-17
.. nonce: 3CNQEX
.. section: Core and Builtins
Improved accuracy of line tracing events and f_lineno attribute of Frame
objects. See PEP 626 for details.
..
.. bpo: 40077
.. date: 2020-11-02-14-39-48
.. nonce: grY9TG
.. section: Core and Builtins
Convert :mod:`mmap` to use heap types.
..
.. bpo: 42233
.. date: 2020-11-01-23-34-56
.. nonce: zOSzja
.. section: Core and Builtins
Allow ``GenericAlias`` objects to use :ref:`union type expressions
<types-union>`. This allows expressions like ``list[int] | dict[float,
str]`` where previously a ``TypeError`` would have been thrown. This also
fixes union type expressions not de-duplicating ``GenericAlias`` objects.
(Contributed by Ken Jin in :issue:`42233`.)
..
.. bpo: 26131
.. date: 2020-10-22-17-27-08
.. nonce: B-Veg7
.. section: Core and Builtins
The import system triggers a ``ImportWarning`` when it falls back to using
``load_module()``.
..
.. bpo: 5054
.. date: 2020-12-04-03-51-12
.. nonce: 53StYZ
.. section: Library
CGIHTTPRequestHandler.run_cgi() HTTP_ACCEPT improperly parsed. Replace the
special purpose getallmatchingheaders with generic get_all method and add
relevant tests.
Original Patch by Martin Panter. Modified by Senthil Kumaran.
..
.. bpo: 42562
.. date: 2020-12-03-22-42-03
.. nonce: 2hPmhi
.. section: Library
Fix issue when dis failed to parse function that has no line numbers. Patch
provided by Yurii Karabas.
..
.. bpo: 17735
.. date: 2020-12-03-22-22-24
.. nonce: Qsaaue
.. section: Library
:func:`inspect.findsource` now raises :exc:`OSError` instead of
:exc:`IndexError` when :attr:`co_lineno` of a code object is greater than
the file length. This can happen, for example, when a file is edited after
it was imported. PR by Irit Katriel.
..
.. bpo: 42116
.. date: 2020-12-03-15-42-32
.. nonce: yIwroP
.. section: Library
Fix handling of trailing comments by :func:`inspect.getsource`.
..
.. bpo: 42532
.. date: 2020-12-02-07-37-59
.. nonce: ObNep_
.. section: Library
Remove unexpected call of ``__bool__`` when passing a ``spec_arg`` argument
to a Mock.
..
.. bpo: 38200
.. date: 2020-11-28-22-52-57
.. nonce: DuWGlW
.. section: Library
Added itertools.pairwise()
..
.. bpo: 41818
.. date: 2020-11-28-06-34-53
.. nonce: mFSMc2
.. section: Library
Fix test_master_read() so that it succeeds on all platforms that either
raise OSError or return b"" upon reading from master.
..
.. bpo: 42487
.. date: 2020-11-28-04-31-20
.. nonce: iqtC4L
.. section: Library
ChainMap.__iter__ no longer calls __getitem__ on underlying maps
..
.. bpo: 42482
.. date: 2020-11-27-16-46-58
.. nonce: EJC3sd
.. section: Library
:class:`~traceback.TracebackException` no longer holds a reference to the
exception's traceback object. Consequently, instances of TracebackException
for equivalent but non-equal exceptions now compare as equal.
..
.. bpo: 41818
.. date: 2020-11-27-09-19-43
.. nonce: KWYUbL
.. section: Library
Make test_openpty() avoid unexpected success due to number of rows and/or
number of columns being == 0.
..
.. bpo: 42392
.. date: 2020-11-26-12-40-16
.. nonce: GbmdHE
.. section: Library
Remove loop parameter from ``asyncio.subprocess`` and ``asyncio.tasks``
functions. Patch provided by Yurii Karabas.
..
.. bpo: 42392
.. date: 2020-11-25-22-44-59
.. nonce: T_DAEl
.. section: Library
Remove loop parameter from ``asyncio.open_connection`` and
``asyncio.start_server`` functions. Patch provided by Yurii Karabas.
..
.. bpo: 28468
.. date: 2020-11-24-13-18-05
.. nonce: 8Gh2d4
.. section: Library
Add :func:`platform.freedesktop_os_release` function to parse
freedesktop.org ``os-release`` files.
..
.. bpo: 42299
.. date: 2020-11-23-23-42-08
.. nonce: Fdn4Wf
.. section: Library
Removed the ``formatter`` module, which was deprecated in Python 3.4. It is
somewhat obsolete, little used, and not tested. It was originally scheduled
to be removed in Python 3.6, but such removals were delayed until after
Python 2.7 EOL. Existing users should copy whatever classes they use into
their code. Patch by Donghee Na and and Terry J. Reedy.
..
.. bpo: 26131
.. date: 2020-11-22-12-30-26
.. nonce: -HsFPG
.. section: Library
Deprecate zipimport.zipimporter.load_module() in favour of exec_module().
..
.. bpo: 41818
.. date: 2020-11-20-14-44-07
.. nonce: 33soAw
.. section: Library
Updated tests for the pty library. test_basic() has been changed to
test_openpty(); this additionally checks if slave termios and slave winsize
are being set properly by pty.openpty(). In order to add support for
FreeBSD, NetBSD, OpenBSD, and Darwin, this also adds test_master_read(),
which demonstrates that pty.spawn() should not depend on an OSError to exit
from its copy loop.
..
.. bpo: 42392
.. date: 2020-11-20-14-01-29
.. nonce: -OUzvl
.. section: Library
Remove loop parameter from ``__init__`` in all ``asyncio.locks`` and
``asyncio.Queue`` classes. Patch provided by Yurii Karabas.
..
.. bpo: 15450
.. date: 2020-11-20-10-38-34
.. nonce: E-y9PA
.. section: Library
Make :class:`filecmp.dircmp` respect subclassing. Now the
:attr:`filecmp.dircmp.subdirs` behaves as expected when subclassing dircmp.
..
.. bpo: 42413
.. date: 2020-11-19-20-27-51
.. nonce: fjHrHx
.. section: Library
The exception :exc:`socket.timeout` is now an alias of :exc:`TimeoutError`.
..
.. bpo: 31904
.. date: 2020-11-19-16-14-36
.. nonce: 83kf9d
.. section: Library
Support signal module on VxWorks.
..
.. bpo: 42406
.. date: 2020-11-19-10-44-41
.. nonce: r9rNCj
.. section: Library
We fixed an issue in ``pickle.whichmodule`` in which importing
``multiprocessing`` could change the how pickle identifies which module an
object belongs to, potentially breaking the unpickling of those objects.
..
.. bpo: 42403
.. date: 2020-11-19-10-12-39
.. nonce: t7q5AX
.. section: Library
Simplify the :mod:`importlib` external bootstrap code:
``importlib._bootstrap_external`` now uses regular imports to import builtin
modules. When it is imported, the builtin :func:`__import__` function is
already fully working and so can be used to import builtin modules like
:mod:`sys`. Patch by Victor Stinner.
..
.. bpo: 1635741
.. date: 2020-11-19-09-59-07
.. nonce: 7cMypH
.. section: Library
Convert _sre module types to heap types (PEP 384). Patch by Erlend E.
Aasland.
..
.. bpo: 42375
.. date: 2020-11-19-04-13-53
.. nonce: U8bp4s
.. section: Library
subprocess module update for DragonFlyBSD support.
..
.. bpo: 41713
.. date: 2020-11-17-23-00-27
.. nonce: -Us0tf
.. section: Library
Port the ``_signal`` extension module to the multi-phase initialization API
(:pep:`489`). Patch by Victor Stinner and Mohamed Koubaa.
..
.. bpo: 37205
.. date: 2020-11-16-15-08-12
.. nonce: Wh5svI
.. section: Library
:func:`time.time`, :func:`time.perf_counter` and
:func:`time.monotonic` functions can no longer fail with a Python fatal
error, instead raise a regular Python exception on failure.
..
.. bpo: 42328
.. date: 2020-11-15-17-02-00
.. nonce: bqpPlR
.. section: Library
Fixed :meth:`tkinter.ttk.Style.map`. The function accepts now the
representation of the default state as empty sequence (as returned by
``Style.map()``). The structure of the result is now the same on all
platform and does not depend on the value of ``wantobjects``.
..
.. bpo: 42345
.. date: 2020-11-15-15-23-34
.. nonce: hiIR7x
.. section: Library
Fix various issues with ``typing.Literal`` parameter handling (flatten,
deduplicate, use type to cache key). Patch provided by Yurii Karabas.
..
.. bpo: 37205
.. date: 2020-11-14-14-34-32
.. nonce: iDbHrw
.. section: Library
:func:`time.perf_counter` on Windows and :func:`time.monotonic` on macOS
are now system-wide. Previously, they used an offset computed at startup to
reduce the precision loss caused by the float type. Use
:func:`time.perf_counter_ns` and :func:`time.monotonic_ns` added in
Python 3.7 to avoid this precision loss.
..
.. bpo: 42318
.. date: 2020-11-14-13-46-27
.. nonce: wYAcBD
.. section: Library
Fixed support of non-BMP characters in :mod:`tkinter` on macOS.
..
.. bpo: 42350
.. date: 2020-11-13-18-53-50
.. nonce: rsql7V
.. section: Library
Fix the :class:`threading.Thread` class at fork: do nothing if the thread is
already stopped (ex: fork called at Python exit). Previously, an error was
logged in the child process.
..
.. bpo: 42333
.. date: 2020-11-12-18-21-15
.. nonce: J9vFmV
.. section: Library
Port _ssl extension module to heap types.
..
.. bpo: 42014
.. date: 2020-11-10-15-40-56
.. nonce: ShM37l
.. section: Library
The ``onerror`` callback from ``shutil.rmtree`` now receives correct
function when ``os.open`` fails.
..
.. bpo: 42237
.. date: 2020-11-10-14-27-49
.. nonce: F363jO
.. section: Library
Fix ``os.sendfile()`` on illumos.
..
.. bpo: 42308
.. date: 2020-11-10-12-09-13
.. nonce: yaJHH9
.. section: Library
Add :data:`threading.__excepthook__` to allow retrieving the original value
of :func:`threading.excepthook` in case it is set to a broken or a different
value. Patch by Mario Corchero.
..
.. bpo: 42131
.. date: 2020-11-06-18-20-47
.. nonce: l2rjjG
.. section: Library
Implement PEP 451/spec methods on zipimport.zipimporter: find_spec(),
create_module(), and exec_module().
This also allows for the documented deprecation of find_loader(),
find_module(), and load_module().
..
.. bpo: 41877
.. date: 2020-11-05-16-00-03
.. nonce: FHbngM
.. section: Library
Mock objects which are not unsafe will now raise an AttributeError if an
attribute with the prefix asert, aseert, or assrt is accessed, in addition
to this already happening for the prefixes assert or assret.
..
.. bpo: 42264
.. date: 2020-11-05-13-32-41
.. nonce: r4KYUU
.. section: Library
``sqlite3.OptimizedUnicode`` has been undocumented and obsolete since Python
3.3, when it was made an alias to :class:`str`. It is now deprecated,
scheduled for removal in Python 3.12.
..
.. bpo: 42251
.. date: 2020-11-03-14-15-35
.. nonce: 6TC32V
.. section: Library
Added :func:`threading.gettrace` and :func:`threading.getprofile` to
retrieve the functions set by :func:`threading.settrace` and
:func:`threading.setprofile` respectively. Patch by Mario Corchero.
..
.. bpo: 42249
.. date: 2020-11-03-09-22-56
.. nonce: vfNO2u
.. section: Library
Fixed writing binary Plist files larger than 4 GiB.
..
.. bpo: 42236
.. date: 2020-11-02-23-05-17
.. nonce: aJ6ZBR
.. section: Library
On Unix, the :func:`os.device_encoding` function now returns ``'UTF-8'``
rather than the device encoding if the :ref:`Python UTF-8 Mode <utf8-mode>`
is enabled.
..
.. bpo: 41754
.. date: 2020-11-01-15-07-20
.. nonce: DraSZh
.. section: Library
webbrowser: Ignore *NotADirectoryError* when calling ``xdg-settings``.
..
.. bpo: 42183
.. date: 2020-10-29-11-17-35
.. nonce: 50ZcIi
.. section: Library
Fix a stack overflow error for asyncio Task or Future repr().
The overflow occurs under some circumstances when a Task or Future
recursively returns itself.
..
.. bpo: 42140
.. date: 2020-10-24-04-02-36
.. nonce: miLqvb
.. section: Library
Improve asyncio.wait function to create the futures set just one time.
..
.. bpo: 42133
.. date: 2020-10-23-15-47-47
.. nonce: BzizYV
.. section: Library
Update various modules in the stdlib to fall back on ``__spec__.loader`` when
``__loader__`` isn't defined on a module.
..
.. bpo: 26131
.. date: 2020-10-22-17-26-35
.. nonce: CAsI3O
.. section: Library
The ``load_module()`` methods found in ``importlib`` now trigger a
``DeprecationWarning``.
..
.. bpo: 39825
.. date: 2020-10-20-08-28-26
.. nonce: n6KnG0
.. section: Library
Windows: Change ``sysconfig.get_config_var('EXT_SUFFIX')`` to the expected
full ``platform_tag.extension`` format. Previously it was hard-coded to
``.pyd``, now it is compatible with ``distutils.sysconfig`` and will result
in something like ``.cp38-win_amd64.pyd``. This brings windows into
conformance with the other platforms.
..
.. bpo: 26389
.. date: 2020-10-08-23-51-55
.. nonce: uga44e
.. section: Library
The :func:`traceback.format_exception`,
:func:`traceback.format_exception_only`, and
:func:`traceback.print_exception` functions can now take an exception object
as a positional-only argument.
..
.. bpo: 41889
.. date: 2020-10-01-16-17-11
.. nonce: qLkNh8
.. section: Library
Enum: fix regression involving inheriting a multiply inherited enum
..
.. bpo: 41861
.. date: 2020-10-01-15-44-52
.. nonce: YTqJ7z
.. section: Library
Convert :mod:`sqlite3` to use heap types (PEP 384). Patch by Erlend E.
Aasland.
..
.. bpo: 40624
.. date: 2020-09-08-03-19-04
.. nonce: 0-gYfx
.. section: Library
Added support for the XPath ``!=`` operator in xml.etree
..
.. bpo: 28850
.. date: 2020-09-06-21-55-44
.. nonce: HJNggD
.. section: Library
Fix :meth:`pprint.PrettyPrinter.format` overrides being ignored for contents
of small containers. The :func:`pprint._safe_repr` function was removed.
..
.. bpo: 41625
.. date: 2020-08-24-16-59-04
.. nonce: Cc967V
.. section: Library
Expose the :c:func:`splice` as :func:`os.splice` in the :mod:`os` module.
Patch by Pablo Galindo
..
.. bpo: 34215
.. date: 2020-08-19-20-17-51
.. nonce: _Cv8c-
.. section: Library
Clarify the error message for :exc:`asyncio.IncompleteReadError` when
``expected`` is ``None``.
..
.. bpo: 41543
.. date: 2020-08-14-00-39-04
.. nonce: RpcRjb
.. section: Library
Add async context manager support for contextlib.nullcontext.
..
.. bpo: 21041
.. date: 2020-08-10-15-06-55
.. nonce: cYz1eL
.. section: Library
:attr:`pathlib.PurePath.parents` now supports negative indexing. Patch
contributed by Yaroslav Pankovych.
..
.. bpo: 41332
.. date: 2020-07-18-17-39-28
.. nonce: QRGmA5
.. section: Library
Added missing connect_accepted_socket() method to
``asyncio.AbstractEventLoop``.
..
.. bpo: 12800
.. date: 2020-07-09-11-32-28
.. nonce: fNgWwx
.. section: Library
Extracting a symlink from a tarball should succeed and overwrite the symlink
if it already exists. The fix is to remove the existing file or symlink
before extraction. Based on patch by Chris AtLee, Jeffrey Kintscher, and
Senthil Kumaran.
..
.. bpo: 40968
.. date: 2020-06-18-11-35-16
.. nonce: R8Edbv
.. section: Library
:mod:`urllib.request` and :mod:`http.client` now send ``http/1.1`` ALPN
extension during TLS handshake when no custom context is supplied.
..
.. bpo: 41001
.. date: 2020-06-17-12-24-26
.. nonce: 5mi7b0
.. section: Library
Add :func:`os.eventfd` to provide a low level interface for Linux's event
notification file descriptor.
..
.. bpo: 40816
.. date: 2020-05-29-15-25-41
.. nonce: w61Pob
.. section: Library
Add AsyncContextDecorator to contextlib to support async context manager as
a decorator.
..
.. bpo: 40550
.. date: 2020-05-08-21-30-54
.. nonce: i7GWkb
.. section: Library
Fix time-of-check/time-of-action issue in subprocess.Popen.send_signal.
..
.. bpo: 39411
.. date: 2020-01-21-16-38-25
.. nonce: 9uHFqT
.. section: Library
Add an ``is_async`` identifier to :mod:`pyclbr`'s ``Function`` objects.
Patch by Batuhan Taskaya
..
.. bpo: 35498
.. date: 2018-12-14-13-29-17
.. nonce: LEJHl7
.. section: Library
Add slice support to :attr:`pathlib.PurePath.parents`.
..
.. bpo: 42238
.. date: 2020-11-24-22-54-49
.. nonce: 62EOTu
.. section: Documentation
Tentative to deprecate ``make suspicious`` by first removing it from the CI
and documentation builds, but keeping it around for manual uses.
..
.. bpo: 42153
.. date: 2020-11-15-13-46-31
.. nonce: KjBhx3
.. section: Documentation
Fix the URL for the IMAP protocol documents.
..
.. bpo: 41028
.. date: 2020-06-18-23-37-03
.. nonce: vM8bC8
.. section: Documentation
Language and version switchers, previously maintained in every cpython
branches, are now handled by docsbuild-script.
..
.. bpo: 41473
.. date: 2020-12-04-11-47-09
.. nonce: W_updK
.. section: Tests
Re-enable test_gdb on gdb 9.2 and newer:
https://bugzilla.redhat.com/show_bug.cgi?id=1866884 bug is fixed in gdb
10.1.
..
.. bpo: 42553
.. date: 2020-12-03-13-32-44
.. nonce: 2TRE2N
.. section: Tests
Fix ``test_asyncio.test_call_later()`` race condition: don't measure asyncio
performance in the ``call_later()`` unit test. The test failed randomly on
the CI.
..
.. bpo: 31904
.. date: 2020-12-01-15-51-19
.. nonce: iwetj4
.. section: Tests
Fix test_netrc on VxWorks: create temporary directories using temp_cwd().
..
.. bpo: 31904
.. date: 2020-11-26-11-13-13
.. nonce: ay4g89
.. section: Tests
skip test_getaddrinfo_ipv6_scopeid_symbolic and
test_getnameinfo_ipv6_scopeid_symbolic on VxWorks
..
.. bpo: 31904
.. date: 2020-11-25-17-00-53
.. nonce: ue4hd9
.. section: Tests
skip test_test of test_mailcap on VxWorks
..
.. bpo: 31904
.. date: 2020-11-24-17-26-41
.. nonce: eug834
.. section: Tests
add shell requirement for test_pipes
..
.. bpo: 31904
.. date: 2020-11-23-11-11-29
.. nonce: V3sUZk
.. section: Tests
skip some tests related to fifo on VxWorks
..
.. bpo: 31904
.. date: 2020-11-20-15-07-18
.. nonce: EBJXjJ
.. section: Tests
Fix test_doctest.py failures for VxWorks.
..
.. bpo: 40754
.. date: 2020-11-13-21-51-34
.. nonce: Ekoxkg
.. section: Tests
Include ``_testinternalcapi`` module in Windows installer for test suite
..
.. bpo: 41561
.. date: 2020-09-18-16-14-03
.. nonce: uPnwrW
.. section: Tests
test_ssl: skip test_min_max_version_mismatch when TLS 1.0 is not available
..
.. bpo: 31904
.. date: 2020-05-20-17-28-46
.. nonce: yt83Ge
.. section: Tests
Fix os module failures for VxWorks RTOS.
..
.. bpo: 31904
.. date: 2020-05-20-14-28-48
.. nonce: yJik6k
.. section: Tests
Fix fifo test cases for VxWorks RTOS.
..
.. bpo: 31904
.. date: 2020-11-19-17-01-50
.. nonce: 894dk2
.. section: Build
remove libnet dependency from detect_socket() for VxWorks
..
.. bpo: 42398
.. date: 2020-11-18-11-58-44
.. nonce: Yt5wO8
.. section: Build
Fix a race condition in "make regen-all" when make -jN option is used to run
jobs in parallel. The clinic.py script now only use atomic write to write
files. Moveover, generated files are now left unchanged if the content does
not change, to not change the file modification time.
..
.. bpo: 41617
.. date: 2020-11-13-15-04-53
.. nonce: 98_oaE
.. section: Build
Fix building ``pycore_bitutils.h`` internal header on old clang version
without ``__builtin_bswap16()`` (ex: Xcode 4.6.3 on Mac OS X 10.7). Patch by
Joshua Root and Victor Stinner.
..
.. bpo: 38823
.. date: 2020-11-12-13-45-15
.. nonce: C0z_Fe
.. section: Build
It is no longer possible to build the ``_ctypes`` extension module without
:c:type:`wchar_t` type: remove ``CTYPES_UNICODE`` macro. Anyway, the
:c:type:`wchar_t` type is required to build Python. Patch by Victor Stinner.
..
.. bpo: 42087
.. date: 2020-10-19-15-41-05
.. nonce: 2AhRFP
.. section: Build
Support was removed for AIX 5.3 and below. See :issue:`40680`.
..
.. bpo: 40998
.. date: 2020-06-17-09-05-02
.. nonce: sgqmg9
.. section: Build
Addressed three compiler warnings found by undefined behavior sanitizer
(ubsan).
..
.. bpo: 42120
.. date: 2020-11-16-22-41-02
.. nonce: 9scgko
.. section: Windows
Remove macro definition of ``copysign`` (to ``_copysign``) in headers.
..
.. bpo: 38506
.. date: 2020-11-15-23-01-14
.. nonce: hhdnuP
.. section: Windows
The Windows launcher now properly handles Python 3.10 when listing installed
Python versions.
..
.. bpo: 42504
.. date: 2020-12-02-15-48-40
.. nonce: RQmMOR
.. section: macOS
Fix build on macOS Big Sur when MACOSX_DEPLOYMENT_TARGET=11
..
.. bpo: 41116
.. date: 2020-11-15-16-43-45
.. nonce: oCkbrF
.. section: macOS
Ensure distutils.unixxcompiler.find_library_file can find system provided
libraries on macOS 11.
..
.. bpo: 41100
.. date: 2020-11-01-16-40-23
.. nonce: BApztP
.. section: macOS
Add support for macOS 11 and Apple Silicon systems.
It is now possible to build "Universal 2" binaries using
"--enable-universalsdk --with-universal-archs=universal2".
Binaries build on later macOS versions can be deployed back to older
versions (tested up to macOS 10.9), when using the correct deployment
target. This is tested using Xcode 11 and later.
..
.. bpo: 42232
.. date: 2020-11-01-15-10-28
.. nonce: 2zI1GN
.. section: macOS
Added Darwin specific madvise options to mmap module.
..
.. bpo: 38443
.. date: 2020-10-23-10-26-53
.. nonce: vu64tl
.. section: macOS
The ``--enable-universalsdk`` and ``--with-universal-archs`` options for the
configure script now check that the specified architectures can be used.
..
.. bpo: 42508
.. date: 2020-11-30-19-46-05
.. nonce: fE7w4M
.. section: IDLE
Keep IDLE running on macOS. Remove obsolete workaround that prevented
running files with shortcuts when using new universal2 installers built on
macOS 11.
..
.. bpo: 42426
.. date: 2020-11-21-17-21-21
.. nonce: kNnPoC
.. section: IDLE
Fix reporting offset of the RE error in searchengine.
..
.. bpo: 42415
.. date: 2020-11-20-01-30-27
.. nonce: CyD-va
.. section: IDLE
Get docstrings for IDLE calltips more often by using inspect.getdoc.
..
.. bpo: 42212
.. date: 2020-11-20-15-11-05
.. nonce: sjzgOf
.. section: Tools/Demos
The smelly.py script now also checks the Python dynamic library and
extension modules, not only the Python static library. Make also the script
more verbose: explain what it does.
..
.. bpo: 36310
.. date: 2020-05-03-01-30-46
.. nonce: xDxxwY
.. section: Tools/Demos
Allow :file:`Tools/i18n/pygettext.py` to detect calls to ``gettext`` in
f-strings.
..
.. bpo: 42423
.. date: 2020-11-21-12-27-19
.. nonce: ByJHhY
.. section: C API
The :c:func:`PyType_FromSpecWithBases` and
:c:func:`PyType_FromModuleAndSpec` functions now accept a single class as
the *bases* argument.
..
.. bpo: 1635741
.. date: 2020-11-19-17-44-36
.. nonce: qBZc3o
.. section: C API
Port :mod:`select` extension module to multiphase initialization
(:pep:`489`).
..
.. bpo: 1635741
.. date: 2020-11-19-16-54-16
.. nonce: 9tVsZt
.. section: C API
Port _posixsubprocess extension module to multiphase initialization
(:pep:`489`).
..
.. bpo: 1635741
.. date: 2020-11-19-15-33-42
.. nonce: 9tVsZt
.. section: C API
Port _posixshmem extension module to multiphase initialization (:pep:`489`)
..
.. bpo: 1635741
.. date: 2020-11-19-12-06-43
.. nonce: KEfZpn
.. section: C API
Port _struct extension module to multiphase initialization (:pep:`489`)
..
.. bpo: 1635741
.. date: 2020-11-19-09-17-01
.. nonce: 6F9o6L
.. section: C API
Port :mod:`!spwd` extension module to multiphase initialization (:pep:`489`)
..
.. bpo: 1635741
.. date: 2020-11-18-20-33-35
.. nonce: B4ztSk
.. section: C API
Port :mod:`gc` extension module to multiphase initialization (:pep:`489`)
..
.. bpo: 1635741
.. date: 2020-11-18-20-11-13
.. nonce: fe3iRb
.. section: C API
Port _queue extension module to multiphase initialization (:pep:`489`)
..
.. bpo: 39573
.. date: 2020-11-18-15-21-59
.. nonce: VB3G2y
.. section: C API
Convert :c:func:`Py_TYPE` and :c:func:`Py_SIZE` back to macros to allow
using them as an l-value. Many third party C extension modules rely on the
ability of using Py_TYPE() and Py_SIZE() to set an object type and size:
``Py_TYPE(obj) = type;`` and ``Py_SIZE(obj) = size;``.
..
.. bpo: 1635741
.. date: 2020-11-18-10-52-38
.. nonce: FrWAwJ
.. section: C API
Port :mod:`symtable` extension module to multiphase initialization
(:pep:`489`)
..
.. bpo: 1635741
.. date: 2020-11-18-09-46-35
.. nonce: SH8OIT
.. section: C API
Port :mod:`grp` and :mod:`pwd` extension modules to multiphase
initialization (:pep:`489`)
..
.. bpo: 1635741
.. date: 2020-11-18-09-16-23
.. nonce: gkoI7Y
.. section: C API
Port _random extension module to multiphase initialization (:pep:`489`)
..
.. bpo: 1635741
.. date: 2020-11-18-08-45-36
.. nonce: VLZfiY
.. section: C API
Port _hashlib extension module to multiphase initialization (:pep:`489`)
..
.. bpo: 41713
.. date: 2020-11-17-15-39-10
.. nonce: Rq99Vc
.. section: C API
Removed the undocumented ``PyOS_InitInterrupts()`` function. Initializing
Python already implicitly installs signal handlers: see
:c:member:`PyConfig.install_signal_handlers`. Patch by Victor Stinner.
..
.. bpo: 40170
.. date: 2020-11-13-01-40-28
.. nonce: uh8lEf
.. section: C API
The ``Py_TRASHCAN_BEGIN`` macro no longer accesses PyTypeObject attributes,
but now can get the condition by calling the new private
:c:func:`!_PyTrash_cond()` function which hides implementation details.
..
.. bpo: 42260
.. date: 2020-11-10-14-27-39
.. nonce: -Br3Co
.. section: C API
:c:func:`Py_GetPath`, :c:func:`Py_GetPrefix`, :c:func:`Py_GetExecPrefix`,
:c:func:`Py_GetProgramFullPath`, :c:func:`Py_GetPythonHome` and
:c:func:`Py_GetProgramName` functions now return ``NULL`` if called before
:c:func:`Py_Initialize` (before Python is initialized). Use the new
:ref:`Python Initialization Configuration API <init-config>` to get the
:ref:`Python Path Configuration. <init-path-config>`. Patch by Victor
Stinner.
..
.. bpo: 42260
.. date: 2020-11-05-18-02-07
.. nonce: pAeaNR
.. section: C API
The :c:func:`PyConfig_Read` function now only parses
:c:member:`PyConfig.argv` arguments once: :c:member:`PyConfig.parse_argv` is
set to ``2`` after arguments are parsed. Since Python arguments are
strippped from :c:member:`PyConfig.argv`, parsing arguments twice would
parse the application options as Python options.
..
.. bpo: 42262
.. date: 2020-11-04-17-22-36
.. nonce: fCWzBb
.. section: C API
Added :c:func:`Py_NewRef` and :c:func:`Py_XNewRef` functions to increment
the reference count of an object and return the object. Patch by Victor
Stinner.
..
.. bpo: 42260
.. date: 2020-11-04-16-31-55
.. nonce: CmgHtF
.. section: C API
When :c:func:`Py_Initialize` is called twice, the second call now updates
more :mod:`sys` attributes for the configuration, rather than only
:data:`sys.argv`. Patch by Victor Stinner.
..
.. bpo: 41832
.. date: 2020-11-03-19-47-06
.. nonce: dL1VJJ
.. section: C API
The :c:func:`PyType_FromModuleAndSpec` function now accepts NULL ``tp_doc``
slot.
..
.. bpo: 1635741
.. date: 2020-11-03-11-52-27
.. nonce: aDYJKB
.. section: C API
Added :c:func:`PyModule_AddObjectRef` function: similar to
:c:func:`PyModule_AddObject` but don't steal a reference to the value on
success. Patch by Victor Stinner.
..
.. bpo: 42171
.. date: 2020-10-27-21-10-14
.. nonce: S3FWTP
.. section: C API
The :c:macro:`METH_FASTCALL` calling convention is added to the limited API.
The functions :c:func:`PyModule_AddType`,
:c:func:`PyType_FromModuleAndSpec`, :c:func:`PyType_GetModule` and
:c:func:`PyType_GetModuleState` are added to the limited API on Windows.
..
.. bpo: 42085
.. date: 2020-10-19-15-58-16
.. nonce: NhEf3W
.. section: C API
Add dedicated entry to PyAsyncMethods for sending values
..
.. bpo: 41073
.. date: 2020-07-08-21-01-49
.. nonce: VqQZON
.. section: C API
:c:func:`PyType_GetSlot()` can now accept static types.
..
.. bpo: 30459
.. date: 2020-05-06-23-54-57
.. nonce: N9_Jai
.. section: C API
:c:func:`PyList_SET_ITEM`, :c:func:`PyTuple_SET_ITEM` and
:c:func:`PyCell_SET` macros can no longer be used as l-value or r-value. For
example, ``x = PyList_SET_ITEM(a, b, c)`` and ``PyList_SET_ITEM(a, b, c) =
x`` now fail with a compiler error. It prevents bugs like ``if
(PyList_SET_ITEM (a, b, c) < 0) ...`` test. Patch by Zackery Spytz and
Victor Stinner.
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