3.13.0a6 - Cpython — ContextQMD

.. date: 2024-04-04-13-42-59 .. gh-issue: 117494 .. nonce: GPQH64 .. release date: 2024-04-09 .. section: Core and Builtins

Refactored the instruction sequence data structure out of compile.c into instruction_sequence.c.

.. date: 2024-04-03-13-44-04 .. gh-issue: 116968 .. nonce: zgcdG2 .. section: Core and Builtins

Introduce a unified 16-bit backoff counter type (_Py_BackoffCounter), shared between the Tier 1 adaptive specializer and the Tier 2 optimizer. The API used for adaptive specialization counters is changed but the behavior is (supposed to be) identical.

The behavior of the Tier 2 counters is changed:

There are no longer dynamic thresholds (we never varied these).
All counters now use the same exponential backoff.
The counter for JUMP_BACKWARD starts counting down from 16.
The temperature in side exits starts counting down from 64.

.. date: 2024-04-03-09-49-15 .. gh-issue: 117431 .. nonce: WAqRgc .. section: Core and Builtins

Improve the performance of the following :class:bytes and :class:bytearray methods by adapting them to the :c:macro:METH_FASTCALL calling convention:

:meth:!endswith
:meth:!startswith

.. date: 2024-04-02-17-37-35 .. gh-issue: 117431 .. nonce: vDKAOn .. section: Core and Builtins

Improve the performance of the following :class:str methods by adapting them to the :c:macro:METH_FASTCALL calling convention:

:meth:~str.count
:meth:~str.endswith
:meth:~str.find
:meth:~str.index
:meth:~str.rfind
:meth:~str.rindex
:meth:~str.startswith

.. date: 2024-04-02-10-04-57 .. gh-issue: 117411 .. nonce: YdyVmG .. section: Core and Builtins

Move PyFutureFeatures to an internal header and make it private.

.. date: 2024-04-02-06-16-49 .. gh-issue: 109120 .. nonce: X485oN .. section: Core and Builtins

Added handle of incorrect star expressions, e.g f(3, *). Patch by Grigoryev Semyon

.. date: 2024-03-26-17-22-38 .. gh-issue: 117266 .. nonce: Kwh79O .. section: Core and Builtins

Fix crashes for certain user-created subclasses of :class:ast.AST. Such classes are now expected to set the _field_types attribute.

.. date: 2024-03-25-17-04-54 .. gh-issue: 99108 .. nonce: 8bjdO6 .. section: Core and Builtins

Updated the :mod:hashlib built-in HACL\* project_ C code from upstream that we use for many implementations when they are not present via OpenSSL in a given build. This also avoids the rare potential for a C symbol name one definition rule linking issue.

.. _HACL* project: https://github.com/hacl-star/hacl-star

.. date: 2024-03-25-12-51-12 .. gh-issue: 117108 .. nonce: tNqDEo .. section: Core and Builtins

Change the old space bit of objects in the young generation from 0 to gcstate->visited, so that any objects created during GC will have the old bit set correctly if they get moved into the old generation.

.. date: 2024-03-21-12-10-11 .. gh-issue: 117108 .. nonce: _6jIrB .. section: Core and Builtins

The cycle GC now chooses the size of increments based on the total heap size, instead of the rate of object creation. This ensures that it can keep up with growing heaps.

.. date: 2024-03-13-16-55-25 .. gh-issue: 116735 .. nonce: o3w6y8 .. section: Core and Builtins

For INSTRUMENTED_CALL_FUNCTION_EX, set arg0 to sys.monitoring.MISSING instead of None for :monitoring-event:CALL event.

.. date: 2024-03-12-20-31-57 .. gh-issue: 113964 .. nonce: bJppzg .. section: Core and Builtins

Starting new threads and process creation through :func:os.fork are now only prevented once all non-daemon threads exit.

.. date: 2024-03-11-22-05-56 .. gh-issue: 116626 .. nonce: GsyczB .. section: Core and Builtins

Ensure INSTRUMENTED_CALL_FUNCTION_EX always emits :monitoring-event:CALL

.. date: 2024-03-11-00-45-39 .. gh-issue: 116554 .. nonce: gYumG5 .. section: Core and Builtins

list.sort() now exploits more cases of partial ordering, particularly those with long descending runs with sub-runs of equal values. Those are recognized as single runs now (previously, each block of repeated values caused a new run to be created).

.. date: 2024-03-07-16-12-39 .. gh-issue: 114099 .. nonce: ujdjn2 .. section: Core and Builtins

Added a Loader that can discover extension modules in an iOS-style Frameworks folder.

.. date: 2024-02-25-14-17-25 .. gh-issue: 115775 .. nonce: CNbGbJ .. section: Core and Builtins

Compiler populates the new __static_attributes__ field on a class with the names of attributes of this class which are accessed through self.X from any function in its body.

.. date: 2024-02-24-03-39-09 .. gh-issue: 115776 .. nonce: THJXqg .. section: Core and Builtins

The array of values, the PyDictValues struct is now embedded in the object during allocation. This provides better performance in the common case, and does not degrade as much when the object's __dict__ is materialized.

.. date: 2024-01-07-04-22-51 .. gh-issue: 108362 .. nonce: oB9Gcf .. section: Core and Builtins

Implement an incremental cyclic garbage collector. By collecting the old generation in increments, there is no need for a full heap scan. This can hugely reduce maximum pause time for programs with large heaps.

Reduce the number of generations from three to two. The old generation is split into two spaces, "visited" and "pending".

Collection happens in two steps:: * An increment is formed from the young generation and a small part of the pending space. * This increment is scanned and the survivors moved to the end of the visited space.

When the collecting space becomes empty, the two spaces are swapped.

.. date: 2023-10-14-00-05-17 .. gh-issue: 109870 .. nonce: oKpJ3P .. section: Library

Dataclasses now calls :func:exec once per dataclass, instead of once per method being added. This can speed up dataclass creation by up to 20%.

.. date: 2022-10-05-09-33-48 .. gh-issue: 97901 .. nonce: BOLluU .. section: Library

Mime type text/rtf is now supported by :mod:mimetypes.

.. bpo: 24612 .. date: 2021-09-04-22-33-01 .. nonce: SsTuUX .. section: Core and Builtins

Improve the :exc:SyntaxError that happens when 'not' appears after an operator. Patch by Pablo Galindo

.. date: 2024-04-08-20-26-15 .. gh-issue: 117648 .. nonce: NzVEa7 .. section: Library

Improve performance of :func:os.path.join and :func:os.path.expanduser.

.. date: 2024-04-06-16-42-34 .. gh-issue: 117584 .. nonce: hqk9Hn .. section: Library

Raise :exc:TypeError for non-paths in :func:posixpath.relpath <os.path.relpath>.

.. date: 2024-04-03-18-36-53 .. gh-issue: 117467 .. nonce: l6rWlj .. section: Library

Preserve mailbox ownership when rewriting in :func:mailbox.mbox.flush <mailbox.Mailbox.flush>. Patch by Tony Mountifield.

.. date: 2024-04-02-20-30-12 .. gh-issue: 114848 .. nonce: YX4pEc .. section: Library

Raise :exc:FileNotFoundError when getcwd() returns '(unreachable)', which can happen on Linux >= 2.6.36 with glibc < 2.27.

.. date: 2024-04-02-13-13-46 .. gh-issue: 117459 .. nonce: jiIZmH .. section: Library

:meth:asyncio.asyncio.run_coroutine_threadsafe now keeps the traceback of :class:CancelledError, :class:TimeoutError and :class:InvalidStateError which are raised in the coroutine.

.. date: 2024-03-29-21-43-19 .. gh-issue: 117381 .. nonce: fT0JFM .. section: Library

Fix error message for :func:ntpath.commonpath.

.. date: 2024-03-29-15-58-01 .. gh-issue: 117337 .. nonce: 7w3Qwp .. section: Library

Deprecate undocumented :func:!glob.glob0 and :func:!glob.glob1 functions. Use :func:glob.glob and pass a directory to its root_dir argument instead.

.. date: 2024-03-29-15-04-13 .. gh-issue: 117349 .. nonce: OB9kQQ .. section: Library

Optimise several functions in :mod:os.path.

.. date: 2024-03-29-12-07-26 .. gh-issue: 117348 .. nonce: WjCYvK .. section: Library

Refactored :meth:configparser.RawConfigParser._read to reduce cyclometric complexity and improve comprehensibility.

.. date: 2024-03-28-19-13-20 .. gh-issue: 117335 .. nonce: d6uKJu .. section: Library

Raise TypeError for non-sequences for :func:ntpath.commonpath.

.. date: 2024-03-28-17-55-22 .. gh-issue: 66449 .. nonce: 4jhuEV .. section: Library

:class:configparser.ConfigParser now accepts unnamed sections before named ones, if configured to do so.

.. date: 2024-03-28-13-54-20 .. gh-issue: 88014 .. nonce: zJz31I .. section: Library

In documentation of :class:gzip.GzipFile in module gzip, explain data type of optional constructor argument mtime, and recommend mtime = 0 for generating deterministic streams.

.. date: 2024-03-27-21-05-52 .. gh-issue: 117310 .. nonce: Bt2wox .. section: Library

Fixed an unlikely early & extra Py_DECREF triggered crash in :mod:ssl when creating a new _ssl._SSLContext if CPython was built implausibly such that the default cipher list is empty or the SSL library it was linked against reports a failure from its C SSL_CTX_set_cipher_list() API.

.. date: 2024-03-27-16-43-42 .. gh-issue: 117294 .. nonce: wbXNFv .. section: Library

A DocTestCase now reports as skipped if all examples in the doctest are skipped.

.. date: 2024-03-26-11-48-39 .. gh-issue: 98966 .. nonce: SayV9y .. section: Library

In :mod:subprocess, raise a more informative message when stdout=STDOUT.

.. date: 2024-03-25-21-15-56 .. gh-issue: 117225 .. nonce: oOaZXb .. section: Library

doctest: only print "and X failed" when non-zero, don't pluralise "1 items". Patch by Hugo van Kemenade.

.. date: 2024-03-25-00-20-16 .. gh-issue: 117205 .. nonce: yV7xGb .. section: Library

Speed up :func:compileall.compile_dir by 20% when using multiprocessing by increasing chunksize.

.. date: 2024-03-23-14-26-18 .. gh-issue: 117178 .. nonce: vTisTG .. section: Library

Fix regression in lazy loading of self-referential modules, introduced in gh-114781.

.. date: 2024-03-23-13-40-13 .. gh-issue: 112383 .. nonce: XuHf3G .. section: Library

Fix :mod:dis module's handling of ENTER_EXECUTOR instructions.

.. date: 2024-03-23-12-28-05 .. gh-issue: 117182 .. nonce: a0KANW .. section: Library

Lazy-loading of modules that modify their own __class__ no longer reverts the __class__ to :class:types.ModuleType.

.. date: 2024-03-21-17-07-38 .. gh-issue: 117084 .. nonce: w1mTpT .. section: Library

Fix :mod:zipfile extraction for directory entries with the name containing backslashes on Windows.

.. date: 2024-03-21-09-57-57 .. gh-issue: 117114 .. nonce: Qu-p55 .. section: Library

Make :func:os.path.isdevdrive available on all platforms. For those that do not offer Dev Drives, it will always return False.

.. date: 2024-03-21-07-27-36 .. gh-issue: 117110 .. nonce: 9K1InX .. section: Library

Fix a bug that prevents subclasses of :class:typing.Any to be instantiated with arguments. Patch by Chris Fu.

.. date: 2024-03-20-23-07-58 .. gh-issue: 109653 .. nonce: uu3lrX .. section: Library

Deferred select imports in importlib.metadata and importlib.resources for a 14% speedup.

.. date: 2024-03-20-16-10-29 .. gh-issue: 70647 .. nonce: FpD6Ar .. section: Library

Start the deprecation period for the current behavior of :func:datetime.datetime.strptime and :func:time.strptime which always fails to parse a date string with a :exc:ValueError involving a day of month such as strptime("02-29", "%m-%d") when a year is not specified and the date happen to be February 29th. This should help avoid users finding new bugs every four years due to a natural mistaken assumption about the API when parsing partial date values.

.. date: 2024-03-19-19-42-25 .. gh-issue: 116987 .. nonce: ZVKUH1 .. section: Library

Fixed :func:inspect.findsource for class code objects.

.. date: 2024-03-19-14-35-57 .. gh-issue: 114099 .. nonce: siNSpK .. section: Library

Modify standard library to allow for iOS platform differences.

.. date: 2024-03-19-11-08-26 .. gh-issue: 90872 .. nonce: ghys95 .. section: Library

On Windows, :meth:subprocess.Popen.wait no longer calls WaitForSingleObject() with a negative timeout: pass 0 ms if the timeout is negative. Patch by Victor Stinner.

.. date: 2024-03-18-14-36-50 .. gh-issue: 116957 .. nonce: dTCs4f .. section: Library

configparser: Don't leave ConfigParser values in an invalid state (stored as a list instead of a str) after an earlier read raised DuplicateSectionError or DuplicateOptionError.

.. date: 2024-03-17-18-12-39 .. gh-issue: 115538 .. nonce: PBiRQB .. section: Library

:class:!_io.WindowsConsoleIO now emit a warning if a boolean value is passed as a filedescriptor argument.

.. date: 2024-03-14-20-59-28 .. gh-issue: 90095 .. nonce: 7UaJ1U .. section: Library

Ignore empty lines and comments in .pdbrc

.. date: 2024-03-14-17-24-59 .. gh-issue: 106531 .. nonce: 9ehywi .. section: Library

Refreshed zipfile.path from zipp 3.18 <https://zipp.readthedocs.io/en/latest/history.html#v3-18-0>, providing better compatibility for PyPy, better glob performance for deeply nested zipfiles, and providing internal access to CompleteDirs.inject for use in other tests (like importlib.resources).

.. date: 2024-03-14-17-21-25 .. gh-issue: 63207 .. nonce: LV16SL .. section: Library

On Windows, :func:time.time now uses the GetSystemTimePreciseAsFileTime() clock to have a resolution better than 1 us, instead of the GetSystemTimeAsFileTime() clock which has a resolution of 15.6 ms. Patch by Victor Stinner.

.. date: 2024-03-14-14-01-46 .. gh-issue: 116764 .. nonce: moB3Lc .. section: Library

Restore support of None and other false values in :mod:urllib.parse functions :func:~urllib.parse.parse_qs and :func:~urllib.parse.parse_qsl. Also, they now raise a TypeError for non-zero integers and non-empty sequences.

.. date: 2024-03-14-10-01-23 .. gh-issue: 116811 .. nonce: _h5iKP .. section: Library

In PathFinder.invalidate_caches, delegate to MetadataPathFinder.invalidate_caches.

.. date: 2024-03-14-09-38-51 .. gh-issue: 116647 .. nonce: h0d_zj .. section: Library

Fix recursive child in dataclasses

.. date: 2024-03-14-01-38-44 .. gh-issue: 113171 .. nonce: VFnObz .. section: Library

Fixed various false positives and false negatives in

:attr:ipaddress.IPv4Address.is_private (see these docs for details)
:attr:ipaddress.IPv4Address.is_global
:attr:ipaddress.IPv6Address.is_private
:attr:ipaddress.IPv6Address.is_global

Also in the corresponding :class:ipaddress.IPv4Network and :class:ipaddress.IPv6Network attributes.

.. date: 2024-03-13-15-45-54 .. gh-issue: 63283 .. nonce: OToJnG .. section: Library

In :mod:encodings.idna, any capitalization of the ACE prefix (xn--) is now acceptable. Patch by Pepijn de Vos and Zackery Spytz.

.. date: 2024-03-12-19-32-17 .. gh-issue: 71042 .. nonce: oI0Ron .. section: Library

Add :func:platform.android_ver, which provides device and OS information on Android.

.. date: 2024-03-12-17-53-14 .. gh-issue: 73468 .. nonce: z4ZzvJ .. section: Library

Added new :func:math.fma function, wrapping C99's fma() operation: fused multiply-add function. Patch by Mark Dickinson and Victor Stinner.

.. date: 2024-03-11-17-04-55 .. gh-issue: 116608 .. nonce: 30f58- .. section: Library

The :mod:importlib.resources functions :func:~importlib.resources.is_resource, :func:~importlib.resources.open_binary, :func:~importlib.resources.open_text, :func:~importlib.resources.path, :func:~importlib.resources.read_binary, and :func:~importlib.resources.read_text are un-deprecated, and support subdirectories via multiple positional arguments. The :func:~importlib.resources.contents function also allows subdirectories, but remains deprecated.

.. date: 2024-03-08-11-31-49 .. gh-issue: 116484 .. nonce: VMAsU7 .. section: Library

Change automatically generated :class:tkinter.Checkbutton widget names to avoid collisions with automatically generated :class:tkinter.ttk.Checkbutton widget names within the same parent widget.

.. date: 2024-03-07-11-10-27 .. gh-issue: 114314 .. nonce: iEhAMH .. section: Library

In :mod:ctypes, ctype data is now stored in type objects directly rather than in a dict subclass. This is an internal change that should not affect usage.

.. date: 2024-03-06-18-30-37 .. gh-issue: 116401 .. nonce: 3Wcda2 .. section: Library

Fix blocking :func:os.fwalk and :func:shutil.rmtree on opening named pipe.

.. date: 2024-03-05-19-56-29 .. gh-issue: 71052 .. nonce: PMDK-- .. section: Library

Implement :func:ctypes.util.find_library on Android.

.. date: 2024-03-01-20-23-57 .. gh-issue: 90535 .. nonce: wXm-jC .. section: Library

Fix support of interval values > 1 in :class:logging.TimedRotatingFileHandler for when='MIDNIGHT' and when='Wx'.

.. date: 2024-02-26-10-06-50 .. gh-issue: 113308 .. nonce: MbvOFt .. section: Library

Remove some internal protected parts from :mod:uuid: _has_uuid_generate_time_safe, _netbios_getnode, _ipconfig_getnode, and _load_system_functions. They were unused.

.. date: 2024-02-18-09-50-31 .. gh-issue: 115627 .. nonce: HGchj0 .. section: Library

Fix the :mod:ssl module error handling of connection terminate by peer. It now throws an OSError with the appropriate error code instead of an EOFError.

.. date: 2024-02-01-08-09-20 .. gh-issue: 114847 .. nonce: -JrWrR .. section: Library

Speed up :func:os.path.realpath on non-Windows platforms.

.. date: 2024-02-01-03-09-38 .. gh-issue: 114271 .. nonce: raCkt5 .. section: Library

Fix a race in threading.Thread.join().

threading._MainThread now always represents the main thread of the main interpreter.

PyThreadState.on_delete and PyThreadState.on_delete_data have been removed.

.. date: 2024-01-22-15-50-58 .. gh-issue: 113538 .. nonce: v2wrwg .. section: Library

Add :meth:asyncio.Server.close_clients and :meth:asyncio.Server.abort_clients methods which allow to more forcefully close an asyncio server.

.. date: 2024-01-02-22-47-12 .. gh-issue: 85287 .. nonce: ZC5DLj .. section: Library

Changes Unicode codecs to return UnicodeEncodeError or UnicodeDecodeError, rather than just UnicodeError.

.. date: 2023-12-28-22-52-45 .. gh-issue: 113548 .. nonce: j6TJ7O .. section: Library

:mod:pdb now allows CLI arguments to pdb -m.

.. date: 2023-12-11-00-51-51 .. gh-issue: 112948 .. nonce: k-OKp5 .. section: Library

Make completion of :mod:pdb similar to Python REPL

.. date: 2023-06-16-19-17-06 .. gh-issue: 105866 .. nonce: 0NBveV .. section: Library

Fixed _get_slots bug which caused error when defining dataclasses with slots and a weakref_slot.

.. date: 2023-05-06-05-00-42 .. gh-issue: 96471 .. nonce: S3X5I- .. section: Library

Add :py:class:asyncio.Queue termination with :py:meth:~asyncio.Queue.shutdown method.

.. date: 2022-06-22-14-45-32 .. gh-issue: 89739 .. nonce: CqZcRL .. section: Library

The :mod:zipimport module can now read ZIP64 files.

.. bpo: 33533 .. date: 2020-10-02-17-35-19 .. nonce: GLIhM5 .. section: Library

:func:asyncio.as_completed now returns an object that is both an asynchronous iterator and plain iterator. The new asynchronous iteration pattern allows for easier correlation between prior tasks and their completed results. This is a closer match to :func:concurrent.futures.as_completed's iteration pattern. Patch by Justin Arthur.

.. bpo: 27578 .. date: 2020-06-11-16-20-33 .. nonce: CIA-fu .. section: Library

:func:inspect.getsource (and related functions) work with empty module files, returning '\n' (or reasonable equivalent) instead of raising OSError. Patch by Kernc.

.. bpo: 37141 .. date: 2019-09-26-17-52-52 .. nonce: onYY2- .. section: Library

Accept an iterable of separators in :meth:asyncio.StreamReader.readuntil, stopping when one of them is encountered.

.. date: 2019-08-27-01-03-26 .. gh-issue: 66543 .. nonce: _TRpYr .. section: Library

Make :func:mimetypes.guess_type properly parsing of URLs with only a host name, URLs containing fragment or query, and filenames with only a UNC sharepoint on Windows. Based on patch by Dong-hee Na.

.. bpo: 15010 .. date: 2019-08-12-19-08-06 .. nonce: 3bY2CF .. section: Library

:meth:unittest.TestLoader.discover now saves the original value of unittest.TestLoader._top_level_dir and restores it at the end of the call.

.. date: 2024-03-20-15-12-37 .. gh-issue: 115977 .. nonce: IMLi6K .. section: Documentation

Remove compatibility references to Emscripten.

.. date: 2024-03-20-12-41-47 .. gh-issue: 114099 .. nonce: ad_Ck9 .. section: Documentation

Add an iOS platform guide, and flag modules not available on iOS.

.. date: 2022-04-15-13-15-23 .. gh-issue: 91565 .. nonce: OznXwC .. section: Documentation

Changes to documentation files and config outputs to reflect the new location for reporting bugs - i.e. GitHub rather than bugs.python.org.

.. date: 2024-03-25-21-31-49 .. gh-issue: 83434 .. nonce: U7Z8cY .. section: Tests

Disable JUnit XML output (--junit-xml=FILE command line option) in regrtest when hunting for reference leaks (-R option). Patch by Victor Stinner.

.. date: 2024-03-24-23-49-25 .. gh-issue: 117187 .. nonce: eMLT5n .. section: Tests

Fix XML tests for vanilla Expat <2.6.0.

.. date: 2024-03-21-11-32-29 .. gh-issue: 116333 .. nonce: F-9Ram .. section: Tests

Tests of TLS related things (error codes, etc) were updated to be more lenient about specific error message strings and behaviors as seen in the BoringSSL and AWS-LC forks of OpenSSL.

.. date: 2024-03-20-14-19-32 .. gh-issue: 117089 .. nonce: WwR1Z1 .. section: Tests

Consolidated tests for importlib.metadata in their own metadata package.

.. date: 2024-03-13-12-06-49 .. gh-issue: 115979 .. nonce: zsNpQD .. section: Tests

Update test_importlib so that it passes under WASI SDK 21.

.. date: 2024-03-11-23-20-28 .. gh-issue: 112536 .. nonce: Qv1RrX .. section: Tests

Add --tsan to test.regrtest for running TSAN tests in reasonable execution times. Patch by Donghee Na.

.. date: 2024-03-06-11-00-36 .. gh-issue: 116307 .. nonce: Uij0t_ .. section: Tests

Added import helper isolated_modules as CleanImport does not remove modules imported during the context. Use it in importlib.resources tests to avoid leaving mod around to impede importlib.metadata tests.

.. date: 2024-03-13-16-16-43 .. gh-issue: 114736 .. nonce: ZhmauG .. section: Build

Have WASI builds use WASI SDK 21.

.. date: 2024-03-08-17-05-15 .. gh-issue: 115983 .. nonce: ZQqk0Q .. section: Build

Skip building test modules that must be built as shared under WASI.

.. date: 2024-03-06-17-26-55 .. gh-issue: 71052 .. nonce: vLbu9u .. section: Build

Add Android build script and instructions.

.. date: 2024-03-28-22-12-00 .. gh-issue: 117267 .. nonce: K_tki1 .. section: Windows

Ensure DirEntry.stat().st_ctime behaves consistently with :func:os.stat during the deprecation period of st_ctime by containing the same value as st_birthtime. After the deprecation period, st_ctime will be the metadata change time (or unavailable through DirEntry), and only st_birthtime will contain the creation time.

.. date: 2024-03-14-20-46-23 .. gh-issue: 116195 .. nonce: Cu_rYs .. section: Windows

Improves performance of :func:os.getppid by using an alternate system API when available. Contributed by vxiiduu.

.. date: 2024-03-14-09-14-21 .. gh-issue: 88494 .. nonce: Bwfmp7 .. section: Windows

On Windows, :func:time.monotonic now uses the QueryPerformanceCounter() clock to have a resolution better than 1 us, instead of the GetTickCount64() clock which has a resolution of 15.6 ms. Patch by Victor Stinner.

.. date: 2024-03-14-01-58-22 .. gh-issue: 116773 .. nonce: H2UldY .. section: Windows

Fix instances of <_overlapped.Overlapped object at 0xXXX> still has pending operation at deallocation, the process may crash.

.. date: 2024-02-24-23-03-43 .. gh-issue: 91227 .. nonce: sL4zWC .. section: Windows

Fix the asyncio ProactorEventLoop implementation so that sending a datagram to an address that is not listening does not prevent receiving any more datagrams.

.. date: 2024-02-08-14-48-15 .. gh-issue: 115119 .. nonce: qMt32O .. section: Windows

Switched from vendored libmpdecimal code to a separately-hosted external package in the cpython-source-deps repository when building the _decimal module.

.. date: 2024-04-08-18-53-33 .. gh-issue: 117642 .. nonce: -tYH .. section: C API

Fix :pep:737 implementation for %#T and %#N.

.. date: 2024-03-22-19-29-24 .. gh-issue: 87193 .. nonce: u7O-jY .. section: C API

:c:func:_PyBytes_Resize can now be called for bytes objects with reference count > 1, including 1-byte bytes objects. It creates a new bytes object and destroys the old one if it has reference count > 1.

.. date: 2024-03-20-13-13-22 .. gh-issue: 117021 .. nonce: 0Q5jBx .. section: C API

Fix integer overflow in :c:func:PyLong_AsPid on non-Windows 64-bit platforms.

.. date: 2024-03-19-09-49-04 .. gh-issue: 115756 .. nonce: 4Ls_Tl .. section: C API

:c:func:!PyCode_GetFirstFree is an ustable API now and has been renamed to :c:func:PyUnstable_Code_GetFirstFree. (Contributed by Bogdan Romanyuk in :gh:115781)

.. date: 2024-03-18-10-58-47 .. gh-issue: 116869 .. nonce: lN0GBl .. section: C API

Add test_cext test: build a C extension to check if the Python C API emits C compiler warnings. Patch by Victor Stinner.

.. date: 2024-03-18-09-58-46 .. gh-issue: 116869 .. nonce: LFDVKM .. section: C API

Make the C API compatible with -Werror=declaration-after-statement compiler flag again. Patch by Victor Stinner.

.. date: 2024-03-17-22-42-21 .. gh-issue: 116936 .. nonce: tNrzfm .. section: C API

Add :c:func:PyType_GetModuleByDef to the limited C API. Patch by Victor Stinner.

.. date: 2024-03-16-12-21-00 .. gh-issue: 116809 .. nonce: JL786L .. section: C API

Restore removed private _PyErr_ChainExceptions1() function. Patch by Victor Stinner.

.. date: 2024-03-15-23-57-33 .. gh-issue: 115754 .. nonce: zLdv82 .. section: C API

In the limited C API version 3.13, getting Py_None, Py_False, Py_True, Py_Ellipsis and Py_NotImplemented singletons is now implemented as function calls at the stable ABI level to hide implementation details. Getting these constants still return borrowed references. Patch by Victor Stinner.

.. date: 2024-03-15-23-55-24 .. gh-issue: 115754 .. nonce: xnzc__ .. section: C API

Add :c:func:Py_GetConstant and :c:func:Py_GetConstantBorrowed functions to get constants. For example, Py_GetConstant(Py_CONSTANT_ZERO) returns a :term:strong reference to the constant zero. Patch by Victor Stinner.

.. date: 2024-03-14-22-30-07 .. gh-issue: 111696 .. nonce: 76UMKi .. section: C API

Add support for %T, %T#, %N and %N# formats to :c:func:PyUnicode_FromFormat: format the fully qualified name of an object type and of a type: call :c:func:PyType_GetModuleName. See :pep:737 for more information. Patch by Victor Stinner.

.. date: 2024-03-14-18-00-32 .. gh-issue: 111696 .. nonce: L6oIPq .. section: C API

Add :c:func:PyType_GetModuleName function to get the type's module name. Equivalent to getting the type.__module__ attribute. Patch by Eric Snow and Victor Stinner.

.. date: 2024-03-14-15-17-11 .. gh-issue: 111696 .. nonce: YmnvAi .. section: C API

Add :c:func:PyType_GetFullyQualifiedName function to get the type's fully qualified name. Equivalent to f"{type.__module__}.{type.__qualname__}", or type.__qualname__ if type.__module__ is not a string or is equal to "builtins". Patch by Victor Stinner.

.. date: 2024-03-14-10-33-58 .. gh-issue: 85283 .. nonce: LOgmdU .. section: C API

The fcntl, grp, pwd, termios, _statistics and _testconsole C extensions are now built with the :ref:limited C API <limited-c-api>. Patch by Victor Stinner.

.. date: 2024-02-28-15-50-01 .. gh-issue: 111140 .. nonce: mpwcUg .. section: C API

Add additional flags to :c:func:PyLong_AsNativeBytes and :c:func:PyLong_FromNativeBytes to allow the caller to determine how to handle edge cases around values that fill the entire buffer.

.. date: 2023-12-12-19-48-31 .. gh-issue: 113024 .. nonce: rXcQs7 .. section: C API

Add :c:func:PyObject_GenericHash function.