3.14.0a1 - Cpython — ContextQMD

.. date: 2024-09-24-10-48-46 .. gh-issue: 124448 .. nonce: bFMrS6 .. release date: 2024-10-15 .. section: macOS

Update bundled Tcl/Tk in macOS installer to 8.6.15.

.. date: 2024-09-07-12-14-54 .. gh-issue: 123797 .. nonce: yFDeug .. section: macOS

Check for runtime availability of ptsname_r function on macos.

.. date: 2024-09-04-11-55-29 .. gh-issue: 123418 .. nonce: 8P4bmN .. section: macOS

Updated macOS installer build to use OpenSSL 3.0.15.

.. date: 2024-09-27-15-07-30 .. gh-issue: 124487 .. nonce: 7LrwHC .. section: Windows

Increases Windows required OS and API level to Windows 10.

.. date: 2024-09-27-13-40-25 .. gh-issue: 124609 .. nonce: WaKk8G .. section: Windows

Fix _Py_ThreadId for Windows builds using MinGW. Patch by Tony Roberts.

.. date: 2024-09-24-19-04-56 .. gh-issue: 124448 .. nonce: srVT3d .. section: Windows

Updated bundled Tcl/Tk to 8.6.15.

.. date: 2024-09-20-11-18-50 .. gh-issue: 124254 .. nonce: iPin-L .. section: Windows

Ensures experimental free-threaded binaries remain installed when updating.

.. date: 2024-09-10-19-23-00 .. gh-issue: 123915 .. nonce: yZMEDO .. section: Windows

Ensure that Tools\msi\buildrelease.bat uses different directories for AMD64 and ARM64 builds.

.. date: 2024-09-04-09-59-18 .. gh-issue: 123418 .. nonce: QaMC12 .. section: Windows

Updated Windows build to use OpenSSL 3.0.15.

.. date: 2024-08-29-16-13-45 .. gh-issue: 123476 .. nonce: m2DFS4 .. section: Windows

Add support for socket.TCP_QUICKACK on Windows platforms.

.. date: 2024-08-01-10-55-15 .. gh-issue: 122573 .. nonce: 4-UCFY .. section: Windows

The Windows build of CPython now requires 3.10 or newer.

.. date: 2024-07-19-21-50-54 .. gh-issue: 100256 .. nonce: GDrKba .. section: Windows

:mod:mimetypes no longer fails when it encounters an inaccessible registry key.

.. date: 2024-05-30-17-39-25 .. gh-issue: 119679 .. nonce: mZC87w .. section: Windows

Ensures correct import libraries are included in Windows installs.

.. date: 2024-05-29-11-06-12 .. gh-issue: 119690 .. nonce: 8q6e1p .. section: Windows

Adds Unicode support and fixes audit events for _winapi.CreateNamedPipe.

.. date: 2024-05-25-18-43-10 .. gh-issue: 111201 .. nonce: SLPJIx .. section: Windows

Add support for new pyrepl on Windows

.. date: 2024-05-22-19-43-29 .. gh-issue: 119070 .. nonce: _enton .. section: Windows

Fixes py.exe handling of shebangs like /usr/bin/env python3.12, which were previously interpreted as python3.exe instead of python3.12.exe.

.. date: 2024-04-24-22-50-33 .. gh-issue: 117505 .. nonce: gcTb_p .. section: Windows

Fixes an issue with the Windows installer not running ensurepip in a fully isolated environment. This could cause unexpected interactions with the user site-packages.

.. date: 2024-04-24-05-16-32 .. gh-issue: 118209 .. nonce: Ryyzlz .. section: Windows

Avoid crashing in :mod:mmap on Windows when the mapped memory is inaccessible due to file system errors or access violations.

.. date: 2022-04-20-18-32-30 .. gh-issue: 79846 .. nonce: Vggv3f .. section: Windows

Makes :code:ssl.create_default_context() ignore invalid certificates in the Windows certificate store

.. date: 2024-09-04-10-07-51 .. gh-issue: 123418 .. nonce: 1eIFZb .. section: Tools/Demos

Update GitHub CI workflows to use OpenSSL 3.0.15 and multissltests to use 3.0.15, 3.1.7, and 3.2.3.

.. date: 2024-10-07-14-13-38 .. gh-issue: 125041 .. nonce: PKLWDf .. section: Tests

Re-enable skipped tests for :mod:zlib on the s390x architecture: only skip checks of the compressed bytes, which can be different between zlib's software implementation and the hardware-accelerated implementation.

.. date: 2024-09-25-12-39-34 .. gh-issue: 124378 .. nonce: Ywwgia .. section: Tests

Updated test_ttk to pass with Tcl/Tk 8.6.15.

.. date: 2024-09-18-18-39-21 .. gh-issue: 124213 .. nonce: AQq_xg .. section: Tests

Detect whether the test suite is running inside a systemd-nspawn container with --suppress-sync=true option, and skip the test_os and test_mmap tests that are failing in this scenario.

.. date: 2024-09-17-22-21-58 .. gh-issue: 124190 .. nonce: 3fWhiX .. section: Tests

Add capability to ignore entire files or directories in check warning CI tool

.. date: 2024-07-17-08-25-06 .. gh-issue: 121921 .. nonce: HW8CIS .. section: Tests

Update Lib/test/crashers/bogus_code_obj.py so that it crashes properly again.

.. date: 2024-07-13-21-55-58 .. gh-issue: 112301 .. nonce: YJS1dl .. section: Tests

Add tooling to check for changes in compiler warnings. Patch by Nate Ohlson.

.. date: 2024-07-13-11-48-20 .. gh-issue: 59022 .. nonce: fYNbQ8 .. section: Tests

Add tests for :func:pkgutil.extend_path. Patch by Andreas Stocker.

.. date: 2024-07-13-11-04-44 .. gh-issue: 99242 .. nonce: aGxnwz .. section: Tests

:func:os.getloadavg may throw :exc:OSError when running regression tests under certain conditions (e.g. chroot). This error is now caught and ignored, since reporting load average is optional.

.. date: 2024-07-04-15-10-29 .. gh-issue: 121084 .. nonce: qxcd5d .. section: Tests

Fix test_typing random leaks. Clear typing ABC caches when running tests for refleaks (-R option): call _abc_caches_clear() on typing abstract classes and their subclasses. Patch by Victor Stinner.

.. date: 2024-07-03-14-41-00 .. gh-issue: 121160 .. nonce: LEtiTd .. section: Tests

Add a test for :func:readline.set_history_length. Note that this test may fail on readline libraries.

.. date: 2024-07-01-16-15-06 .. gh-issue: 121200 .. nonce: 4Pc-gc .. section: Tests

Fix test_expanduser_pwd2() of test_posixpath. Call getpwnam() to get pw_dir, since it can be different than getpwall() pw_dir. Patch by Victor Stinner.

.. date: 2024-07-01-09-04-32 .. gh-issue: 121188 .. nonce: XbuTVa .. section: Tests

When creating the JUnit XML file, regrtest now escapes characters which are invalid in XML, such as the chr(27) control character used in ANSI escape sequences. Patch by Victor Stinner.

.. date: 2024-06-20-12-51-26 .. gh-issue: 120801 .. nonce: lMVXC9 .. section: Tests

Cleaned up fixtures for importlib.metadata tests and consolidated behavior with 'test.support.os_helper'.

.. date: 2024-05-29-15-28-08 .. gh-issue: 119727 .. nonce: dVkaZM .. section: Tests

Add --single-process command line option to Python test runner (regrtest). Patch by Victor Stinner.

.. date: 2024-05-20-18-06-31 .. gh-issue: 119273 .. nonce: hf-yhX .. section: Tests

Python test runner no longer runs tests using TTY (ex: test_ioctl) in a process group (using setsid()). Previously, tests using TTY were skipped. Patch by Victor Stinner.

.. date: 2024-05-18-10-59-27 .. gh-issue: 119050 .. nonce: g4qiH7 .. section: Tests

regrtest test runner: Add XML support to the refleak checker (-R option). Patch by Victor Stinner.

.. date: 2024-05-04-22-56-41 .. gh-issue: 101525 .. nonce: LHK166 .. section: Tests

Skip test_gdb if the binary is relocated by BOLT. Patch by Donghee Na.

.. date: 2023-08-03-17-26-55 .. gh-issue: 107562 .. nonce: ZnbscS .. section: Tests

Test certificates have been updated to expire far in the future. This allows testing Y2038 with system time set to after that, so that actual Y2038 issues can be exposed, and not masked by expired certificate errors.

.. date: 2024-10-09-20-08-13 .. gh-issue: 125140 .. nonce: YgNWRB .. section: Security

Remove the current directory from sys.path when using PyREPL.

.. date: 2024-09-04-12-41-35 .. gh-issue: 123678 .. nonce: N41y9n .. section: Security

Upgrade libexpat to 2.6.3

.. date: 2024-08-14-19-43-57 .. gh-issue: 112301 .. nonce: IQUcOy .. section: Security

Enable compiler options that warn of potential security vulnerabilities.

.. date: 2024-08-07-10-42-13 .. gh-issue: 122792 .. nonce: oiTMo9 .. section: Security

Changed IPv4-mapped ipaddress.IPv6Address to consistently use the mapped IPv4 address value for deciding properties. Properties which have their behavior fixed are is_multicast, is_reserved, is_link_local, is_global, and is_unspecified.

.. date: 2024-08-06-00-06-23 .. gh-issue: 112301 .. nonce: 4k4lw6 .. section: Security

Add ability to ignore warnings per file with warning count in warning checking tooling. Patch by Nate Ohlson.

.. date: 2024-07-24-05-18-25 .. gh-issue: 112301 .. nonce: lfINgZ .. section: Security

Add macOS warning tracking to warning check tooling. Patch by Nate Ohlson.

.. date: 2024-07-22-13-11-28 .. gh-issue: 122133 .. nonce: 0mPeta .. section: Security

Authenticate the socket connection for the socket.socketpair() fallback on platforms where AF_UNIX is not available like Windows.

Patch by Gregory P. Smith [email protected] and Seth Larson [email protected]. Reported by Ellie [email protected]

.. date: 2024-07-18-13-17-47 .. gh-issue: 121957 .. nonce: QemKLU .. section: Security

Fixed missing audit events around interactive use of Python, now also properly firing for python -i, as well as for python -m asyncio. The events in question are cpython.run_stdin and cpython.run_startup.

.. date: 2024-07-08-23-39-04 .. gh-issue: 112301 .. nonce: TD8G01 .. section: Security

Enable runtime protections for glibc to abort execution when unsafe behavior is encountered, for all platforms except Windows.

.. date: 2024-07-02-13-39-20 .. gh-issue: 121285 .. nonce: hrl-yI .. section: Security

Remove backtracking from tarfile header parsing for hdrcharset, PAX, and GNU sparse headers.

.. date: 2024-06-25-04-42-43 .. gh-issue: 112301 .. nonce: god4IC .. section: Security

Add default compiler options to improve security. Enable -Wimplicit-fallthrough, -fstack-protector-strong, -Wtrampolines.

.. date: 2024-05-08-21-59-38 .. gh-issue: 118773 .. nonce: 7dFRJY .. section: Security

Fixes creation of ACLs in :func:os.mkdir on Windows to work correctly on non-English machines.

.. date: 2024-05-01-20-57-09 .. gh-issue: 118486 .. nonce: K44KJG .. section: Security

:func:os.mkdir on Windows now accepts mode of 0o700 to restrict the new directory to the current user. This fixes :cve:2024-4030 affecting :func:tempfile.mkdtemp in scenarios where the base temporary directory is more permissive than the default.

.. date: 2024-10-14-04-44-12 .. gh-issue: 125422 .. nonce: MlVuC6 .. section: Library

Fixed the bug where :mod:pdb and :mod:bdb can step into the bottom caller frame.

.. date: 2024-10-14-02-27-03 .. gh-issue: 100141 .. nonce: NuAcwa .. section: Library

Fixed the bug where :mod:pdb will be stuck in an infinite loop when debugging an empty file.

.. date: 2024-10-13-20-21-35 .. gh-issue: 53203 .. nonce: Rz1c8A .. section: Library

Fix :func:time.strptime for %c, %x and %X formats in many locales that use non-ASCII digits, like Persian, Burmese, Odia and Shan.

.. date: 2024-10-11-18-03-05 .. gh-issue: 125206 .. nonce: pWRRK6 .. section: Library

Workaround for old libffi versions is added. Module ctypes supports :c:expr:double complex only with libffi >= 3.3.0. Patch by Mikhail Efimov.

.. date: 2024-10-11-16-19-46 .. gh-issue: 89967 .. nonce: vhWUOR .. section: Library

Make :class:~weakref.WeakKeyDictionary and :class:~weakref.WeakValueDictionary safe against concurrent mutations from other threads. Patch by Kumar Aditya.

.. date: 2024-10-11-04-04-38 .. gh-issue: 125260 .. nonce: PeZ0Mb .. section: Library

The :func:gzip.compress mtime parameter now defaults to 0 for reproducible output. Patch by Bernhard M. Wiedemann and Adam Turner.

.. date: 2024-10-10-20-39-57 .. gh-issue: 125243 .. nonce: eUbbtu .. section: Library

Fix data race when creating :class:zoneinfo.ZoneInfo objects in the free threading build.

.. date: 2024-10-10-19-57-35 .. gh-issue: 125254 .. nonce: RtZxXS .. section: Library

Fix a bug where ArgumentError includes the incorrect ambiguous option in :mod:argparse.

.. date: 2024-10-10-18-33-31 .. gh-issue: 125235 .. nonce: 0kOB5I .. section: Library

Keep :mod:tkinter TCL paths in venv pointing to base installation on Windows.

.. date: 2024-10-09-21-42-43 .. gh-issue: 61011 .. nonce: pQXZb1 .. section: Library

Fix inheritance of nested mutually exclusive groups from parent parser in :class:argparse.ArgumentParser. Previously, all nested mutually exclusive groups lost their connection to the group containing them and were displayed as belonging directly to the parser.

.. date: 2024-10-09-07-09-00 .. gh-issue: 125118 .. nonce: J9rQ1S .. section: Library

Don't copy arbitrary values to :c:expr:_Bool in the :mod:struct module.

.. date: 2024-10-08-21-17-16 .. gh-issue: 125069 .. nonce: 0RP0Mx .. section: Library

Fix an issue where providing a :class:pathlib.PurePath object as an initializer argument to a second :class:~pathlib.PurePath object with a different :attr:~pathlib.PurePath.parser resulted in arguments to the former object's initializer being joined by the latter object's parser.

.. date: 2024-10-08-13-28-22 .. gh-issue: 125096 .. nonce: Vz0W5g .. section: Library

If the :envvar:PYTHON_BASIC_REPL environment variable is set, the :mod:site module no longer imports the :mod:!_pyrepl module. Moreover, the :mod:site module now respects :option:-E and :option:-I command line options: ignore :envvar:PYTHON_BASIC_REPL in this case. Patch by Victor Stinner.

.. date: 2024-10-08-12-09-09 .. gh-issue: 124969 .. nonce: _VBQLq .. section: Library

Fix locale.nl_langinfo(locale.ALT_DIGITS). Now it returns a tuple of up to 100 strings (an empty tuple on most locales). Previously it returned the first item of that tuple or an empty string.

.. date: 2024-10-05-15-49-53 .. gh-issue: 124960 .. nonce: Bol9hT .. section: Library

Fix support for the barry_as_FLUFL future flag in the new REPL.

.. date: 2024-10-04-12-43-03 .. gh-issue: 69998 .. nonce: DVqOXX .. section: Library

Fix :func:locale.nl_langinfo in case when different categories have different locales. The function now sets temporarily the LC_CTYPE locale in some cases. This temporary change affects other threads.

.. date: 2024-10-04-08-46-00 .. gh-issue: 124958 .. nonce: rea9-x .. section: Library

Fix refcycles in exceptions raised from :class:asyncio.TaskGroup and the python implementation of :class:asyncio.Future

.. date: 2024-10-03-20-45-57 .. gh-issue: 53203 .. nonce: 3Sk4Ia .. section: Library

Fix :func:time.strptime for %c and %x formats in many locales: Arabic, Bislama, Breton, Bodo, Kashubian, Chuvash, Estonian, French, Irish, Ge'ez, Gurajati, Manx Gaelic, Hebrew, Hindi, Chhattisgarhi, Haitian Kreyol, Japanese, Kannada, Korean, Marathi, Malay, Norwegian, Nynorsk, Punjabi, Rajasthani, Tok Pisin, Yoruba, Yue Chinese, Yau/Nungon and Chinese.

.. date: 2024-10-03-19-16-38 .. gh-issue: 123961 .. nonce: ik1Dgs .. section: Library

Convert :mod:curses to multi-phase initialization (:pep:489), thereby fixing reference leaks at interpreter shutdown. Patch by Bénédikt Tran.

.. date: 2024-10-03-17-13-22 .. gh-issue: 124944 .. nonce: YyLAzf .. section: Library

Add SO_ORIGINAL_DST to the :mod:socket module.

.. date: 2024-10-03-05-00-25 .. gh-issue: 117151 .. nonce: Prdw_W .. section: Library

The default buffer size used by :func:shutil.copyfileobj has been increased from 64k to 256k on non-Windows platforms. It was already larger on Windows.

.. date: 2024-10-02-22-53-48 .. gh-issue: 90102 .. nonce: 4qX52R .. section: Library

Skip the isatty system call during open() when the file is known to not be a character device. This provides a slight performance improvement when reading whole files.

.. date: 2024-10-02-21-11-18 .. gh-issue: 124917 .. nonce: Lnwh5b .. section: Library

Allow calling :func:os.path.exists and :func:os.path.lexists with keyword arguments on Windows. Fixes a regression in 3.13.0.

.. date: 2024-10-02-16-35-07 .. gh-issue: 65865 .. nonce: S2D4wq .. section: Library

:mod:argparse now raises early error for invalid help arguments to :meth:~argparse.ArgumentParser.add_argument, :meth:~argparse.ArgumentParser.add_subparsers and :meth:!add_parser.

.. date: 2024-10-02-15-05-45 .. gh-issue: 124653 .. nonce: tqsTu9 .. section: Library

Fix detection of the minimal Queue API needed by the :mod:logging module. Patch by Bénédikt Tran.

.. date: 2024-10-01-23-29-09 .. gh-issue: 91818 .. nonce: Kz8cPI .. section: Library

The CLI of many modules (:mod:ast, :mod:ensurepip, :mod:json, :mod:pdb, :mod:sqlite3, :mod:tokenize, :mod:venv) now uses the actual executable name instead of simply "python" to display in the usage message.

.. date: 2024-10-01-17-12-20 .. gh-issue: 124858 .. nonce: Zy0tvT .. section: Library

Fix reference cycles left in tracebacks in :func:asyncio.open_connection when used with happy_eyeballs_delay

.. date: 2024-10-01-13-46-58 .. gh-issue: 124390 .. nonce: dK1Zcm .. section: Library

Fixed :exc:AssertionError when using :func:!asyncio.staggered.staggered_race with :data:asyncio.eager_task_factory.

.. date: 2024-10-01-13-11-53 .. gh-issue: 85935 .. nonce: CTwJUy .. section: Library

:meth:argparse.ArgumentParser.add_argument now raises an exception if an :ref:action that does not consume arguments (like 'store_const' or 'store_true') or explicit nargs=0 are specified for positional arguments.

.. date: 2024-10-01-12-43-42 .. gh-issue: 124835 .. nonce: SVyp3K .. section: Library

Make :func:tomllib.loads raise :exc:TypeError not :exc:AttributeError on bad input types that do not have the replace attribute. Improve error message when :class:bytes is received.

.. date: 2024-10-01-02-31-13 .. gh-issue: 124693 .. nonce: qzbXKB .. section: Library

Fix a bug where :mod:argparse doesn't recognize negative complex numbers or negative numbers using scientific notation.

.. date: 2024-09-30-20-46-32 .. gh-issue: 124787 .. nonce: 3FnJnP .. section: Library

Fix :class:typing.TypeAliasType with incorrect type_params argument. Now it raises a :exc:TypeError when a type parameter without a default follows one with a default, and when an entry in the type_params tuple is not a type parameter object.

.. date: 2024-09-30-19-59-28 .. gh-issue: 66436 .. nonce: 4gYN_n .. section: Library

Improved :ref:prog default value for :class:argparse.ArgumentParser. It will now include the name of the Python executable along with the module or package name, or the path to a directory, ZIP file, or directory within a ZIP file if the code was run that way.

.. date: 2024-09-27-15-16-04 .. gh-issue: 116850 .. nonce: dBkR0- .. section: Library

Fix :mod:argparse for namespaces with not directly writable dict (e.g. classes).

.. date: 2024-09-27-06-39-32 .. gh-issue: 101552 .. nonce: xYkzag .. section: Library

Add an annoation_format parameter to :func:inspect.signature. Add an quote_annotation_strings parameter to :meth:inspect.Signature.format. Use the new functionality to improve the display of annotations in signatures in :mod:pydoc. Patch by Jelle Zijlstra.

.. date: 2024-09-26-22-14-12 .. gh-issue: 58573 .. nonce: hozbm9 .. section: Library

Fix conflicts between abbreviated long options in the parent parser and subparsers in :mod:argparse.

.. date: 2024-09-26-13-43-39 .. gh-issue: 124594 .. nonce: peYhsP .. section: Library

All :mod:asyncio REPL prompts run in the same :class:context <contextvars.Context>. Contributed by Bartosz Sławecki.

.. date: 2024-09-26-09-18-09 .. gh-issue: 61181 .. nonce: dwjmch .. section: Library

Fix support of :ref:choices with string value in :mod:argparse. Substrings of the specified string no longer considered valid values.

.. date: 2024-09-26-00-35-24 .. gh-issue: 116750 .. nonce: X1aMHI .. section: Library

Provide :func:sys.monitoring.clear_tool_id to unregister all events and callbacks set by the tool.

.. date: 2024-09-25-22-06-52 .. gh-issue: 124552 .. nonce: 1nQKNM .. section: Library

Improve the accuracy of :mod:bdb's check for the possibility of breakpoint in a frame. This makes it possible to disable unnecessary events in functions.

.. date: 2024-09-25-18-34-48 .. gh-issue: 124538 .. nonce: nXZk4R .. section: Library

Fixed crash when using :func:gc.get_referents on a capsule object.

.. date: 2024-09-25-18-08-29 .. gh-issue: 80259 .. nonce: kO5Tw7 .. section: Library

Fix :mod:argparse support of positional arguments with nargs='?', default=argparse.SUPPRESS and specified type.

.. date: 2024-09-25-18-07-51 .. gh-issue: 120378 .. nonce: NlBSz_ .. section: Library

Fix a crash related to an integer overflow in :func:curses.resizeterm and :func:curses.resize_term.

.. date: 2024-09-25-12-14-58 .. gh-issue: 124498 .. nonce: Ozxs55 .. section: Library

Fix :class:typing.TypeAliasType not to be generic, when type_params is an empty tuple.

.. date: 2024-09-25-10-25-57 .. gh-issue: 53834 .. nonce: uyIckw .. section: Library

Fix support of arguments with :ref:choices in :mod:argparse. Positional arguments with :ref:nargs equal to '?' or '*' no longer check :ref:default against choices. Optional arguments with nargs equal to '?' no longer check :ref:const against choices.

.. date: 2024-09-24-22-38-51 .. gh-issue: 123884 .. nonce: iEPTK4 .. section: Library

Fixed bug in itertools.tee() handling of other tee inputs (a tee in a tee). The output now has the promised n independent new iterators. Formerly, the first iterator was identical (not independent) to the input iterator. This would sometimes give surprising results.

.. date: 2024-09-24-21-15-27 .. gh-issue: 123017 .. nonce: dSAr2f .. section: Library

Due to unreliable results on some devices, :func:time.strftime no longer accepts negative years on Android.

.. date: 2024-09-24-19-32-14 .. gh-issue: 123014 .. nonce: zVcfkZ .. section: Library

:func:os.pidfd_open and :func:signal.pidfd_send_signal are now unavailable when building against Android API levels older than 31, since the underlying system calls may cause a crash.

.. date: 2024-09-24-13-32-16 .. gh-issue: 124176 .. nonce: 6hmOPz .. section: Library

Add support for :func:dataclasses.dataclass in :func:unittest.mock.create_autospec. Now create_autospec will check for potential dataclasses and use :func:dataclasses.fields function to retrieve the spec information.

.. date: 2024-09-24-12-34-48 .. gh-issue: 124345 .. nonce: s3vKql .. section: Library

:mod:argparse supports abbreviated single-dash long options separated by = from its value.

.. date: 2024-09-24-00-01-24 .. gh-issue: 124400 .. nonce: 0XCgfe .. section: Library

Fixed a :mod:pdb bug where until has no effect when it appears in a commands sequence. Also avoid printing the frame information at a breakpoint that has a command list containing a command that resumes execution.

.. date: 2024-09-23-18-26-17 .. gh-issue: 90562 .. nonce: Yj566G .. section: Library

Modify dataclasses to support zero-argument super() when slots=True is specified. This works by modifying all references to __class__ to point to the newly created class.

.. date: 2024-09-23-17-33-47 .. gh-issue: 104860 .. nonce: O86OSc .. section: Library

Fix disallowing abbreviation of single-dash long options in :mod:argparse with allow_abbrev=False.

.. date: 2024-09-21-23-56-41 .. gh-issue: 63143 .. nonce: YKu-LQ .. section: Library

Fix parsing mutually exclusive arguments in :mod:argparse. Arguments with the value identical to the default value (e.g. booleans, small integers, empty or 1-character strings) are no longer considered "not present".

.. date: 2024-09-21-22-32-21 .. gh-issue: 72795 .. nonce: naLmkX .. section: Library

Positional arguments with :ref:nargs equal to '*' or :data:!argparse.REMAINDER are no longer required. This allows to use positional argument with nargs='*' and without default in mutually exclusive group and improves error message about required arguments.

.. date: 2024-09-21-19-02-37 .. gh-issue: 59317 .. nonce: OAhNZZ .. section: Library

Fix parsing positional argument with :ref:nargs equal to '?' or '*' if it is preceded by an option and another positional argument.

.. date: 2024-09-20-18-23-19 .. gh-issue: 100980 .. nonce: 8nVAB6 .. section: Library

The :attr:~ctypes.Structure._fields_ attribute of :class:ctypes.Structure and :class:~ctypes.Union is no longer set if the setattr operation raises an error.

.. date: 2024-09-20-12-23-11 .. gh-issue: 53780 .. nonce: mrV1zi .. section: Library

:mod:argparse now ignores the first "--" (double dash) between an option and command.

.. date: 2024-09-19-20-15-00 .. gh-issue: 124217 .. nonce: j0KlQB .. section: Library

Add RFC 9637 reserved IPv6 block 3fff::/20 in :mod:ipaddress module.

.. date: 2024-09-19-16-00-22 .. gh-issue: 111513 .. nonce: 6jHm02 .. section: Library

Improve the error message that may be raised by :meth:datetime.date.fromtimestamp.

.. date: 2024-09-19-11-47-39 .. gh-issue: 124248 .. nonce: g7rufd .. section: Library

Fixed potential crash when using :mod:struct to process zero-width 'Pascal string' fields (0p).

.. date: 2024-09-19-10-36-18 .. gh-issue: 81691 .. nonce: Hyhp_U .. section: Library

Fix handling of multiple "--" (double dashes) in :mod:argparse. Only the first one has now been removed, all subsequent ones are now taken literally.

.. date: 2024-09-19-03-46-59 .. gh-issue: 87041 .. nonce: 9Ox7Bv .. section: Library

Fix a bug in :mod:argparse where lengthy subparser argument help is incorrectly indented.

.. date: 2024-09-19-00-09-48 .. gh-issue: 84559 .. nonce: IrxvQe .. section: Library

The default :mod:multiprocessing start method on Linux and other POSIX systems has been changed away from often unsafe "fork" to "forkserver" (when the platform supports sending file handles over pipes as most do) or "spawn". Mac and Windows are unchanged as they already default to "spawn".

.. date: 2024-09-18-17-45-52 .. gh-issue: 124212 .. nonce: n6kIby .. section: Library

Fix invalid variable in :mod:venv handling of failed symlink on Windows

.. date: 2024-09-17-18-06-42 .. gh-issue: 124171 .. nonce: PHCvRJ .. section: Library

Add workaround for broken :c:func:!fmod() implementations on Windows, that loose zero sign (e.g. fmod(-10, 1) returns 0.0). Patch by Sergey B Kirpichev.

.. date: 2024-09-16-12-31-48 .. gh-issue: 123978 .. nonce: z3smEu .. section: Library

Remove broken :func:time.thread_time and :func:time.thread_time_ns on NetBSD.

.. date: 2024-09-13-10-34-19 .. gh-issue: 123934 .. nonce: yMe7mL .. section: Library

Fix :class:unittest.mock.MagicMock resetting magic methods return values after .reset_mock(return_value=True) was called.

.. date: 2024-09-12-10-55-19 .. gh-issue: 124016 .. nonce: ncs0hd .. section: Library

Update :mod:unicodedata database to Unicode 16.0.0.

.. date: 2024-09-11-19-12-23 .. gh-issue: 123968 .. nonce: OwHON_ .. section: Library

Fix the command-line interface for the :mod:random module to select floats between 0 and N, not 1 and N.

.. date: 2024-09-11-19-05-32 .. gh-issue: 123945 .. nonce: jLwybB .. section: Library

Fix a bug where :mod:argparse doesn't recognize negative numbers with underscores

.. date: 2024-09-11-13-33-19 .. gh-issue: 123935 .. nonce: fRZ_56 .. section: Library

Fix parent slots detection for dataclasses that inherit from classes with __dictoffset__.

.. date: 2024-09-10-11-26-14 .. gh-issue: 123892 .. nonce: 2gzIrz .. section: Library

Add "_wmi" to :data:sys.stdlib_module_names. Patch by Victor Stinner.

.. date: 2024-09-06-10-17-54 .. gh-issue: 84808 .. nonce: ION67Z .. section: Library

Fix error handling in :py:class:~socket.socket method :py:func:~socket.socket.connect_ex on platforms where :c:data:errno can be negative.

.. date: 2024-09-06-01-35-11 .. gh-issue: 123756 .. nonce: Ozbhke .. section: Library

Added a new argument mode to :class:pdb.Pdb. Only allow :mod:pdb from command line to use restart command.

.. date: 2024-09-06-00-00-43 .. gh-issue: 122765 .. nonce: tx4hsr .. section: Library

Fix unbalanced quote errors occurring when activate.csh in :mod:venv was sourced with a custom prompt containing unpaired quotes or newlines.

.. date: 2024-09-04-18-23-43 .. gh-issue: 123657 .. nonce: Oks4So .. section: Library

Fix crash and memory leak in :func:decimal.getcontext. It crashed when using a thread-local context by --with-decimal-contextvar=no.

.. date: 2024-09-02-20-34-04 .. gh-issue: 123339 .. nonce: czgcSu .. section: Library

Fix :func:inspect.getsource for classes in :mod:collections.abc and :mod:decimal (for pure Python implementation) modules. :func:inspect.getcomments now raises OSError instead of IndexError if the __firstlineno__ value for a class is out of bound.

.. date: 2024-08-31-12-34-44 .. gh-issue: 123374 .. nonce: 3kE7rb .. section: Library

Remove check for redefined memo entry in :func:pickletools.dis.

.. date: 2024-08-30-09-01-35 .. gh-issue: 123504 .. nonce: lJ9_BB .. section: Library

Fixed reference leak in the finalization of :mod:tkinter.

.. date: 2024-08-29-14-51-36 .. gh-issue: 123430 .. nonce: M7wXl9 .. section: Library

Pages generated by the :mod:http.server module allow the browser to apply its default dark mode.

.. date: 2024-08-29-09-27-12 .. gh-issue: 123446 .. nonce: _I_mMr .. section: Library

Fix empty function name in :exc:TypeError when :func:csv.reader, :func:csv.writer, or :func:csv.register_dialect are used without the required args.

.. date: 2024-08-28-20-08-19 .. gh-issue: 123448 .. nonce: tItJlp .. section: Library

Fixed memory leak of :class:typing.NoDefault by moving it to the static types array.

.. date: 2024-08-28-13-03-36 .. gh-issue: 123409 .. nonce: lW0YF- .. section: Library

Fix :attr:ipaddress.IPv6Address.reverse_pointer output according to :rfc:RFC 3596, §2.5 <3596#section-2.5>. Patch by Bénédikt Tran.

.. date: 2024-08-27-12-38-42 .. gh-issue: 123089 .. nonce: vA7iFR .. section: Library

Make :class:weakref.WeakSet safe against concurrent mutations while it is being iterated. Patch by Kumar Aditya.

.. date: 2024-08-27-12-11-00 .. gh-issue: 123363 .. nonce: gKuJp6 .. section: Library

Show string value of :opcode:CONTAINS_OP oparg in :mod:dis output. Patch by Alexandr153.

.. date: 2024-08-27-10-30-37 .. gh-issue: 123341 .. nonce: 5e-fjt .. section: Library

Add :meth:~object.__class_getitem__ to :class:!tkinter.Event for type subscript support at runtime. Patch by Adonis Rakateli.

.. date: 2024-08-26-19-36-00 .. gh-issue: 123340 .. nonce: mQKI1H .. section: Library

Show string value of :opcode:IS_OP oparg in :mod:dis output.

.. date: 2024-08-26-18-48-13 .. gh-issue: 119518 .. nonce: QFYH9q .. section: Library

Speed up normalization of :class:pathlib.PurePath and :class:~pathlib.Path objects by not interning string parts.

.. date: 2024-08-26-13-45-20 .. gh-issue: 123270 .. nonce: gXHvNJ .. section: Library

Applied a more surgical fix for malformed payloads in :class:zipfile.Path causing infinite loops (gh-122905) without breaking contents using legitimate characters.

.. date: 2024-08-25-16-59-20 .. gh-issue: 73991 .. nonce: 1w8u3K .. section: Library

Add :meth:pathlib.Path.copy_into and :meth:~pathlib.Path.move_into, which copy and move files and directories into existing directories.

.. date: 2024-08-24-06-05-41 .. gh-issue: 123228 .. nonce: jR_5O5 .. section: Library

Fix return type for :func:!_pyrepl.readline._ReadlineWrapper.get_line_buffer to be :func:str. Patch by Sergey B Kirpichev.

.. date: 2024-08-24-00-03-01 .. gh-issue: 123240 .. nonce: uFPG3l .. section: Library

Raise audit events for the :func:input in the new REPL.

.. date: 2024-08-23-22-01-30 .. gh-issue: 76960 .. nonce: vsANPu .. section: Library

Fix :func:urllib.parse.urljoin and :func:urllib.parse.urldefrag for URIs containing empty components. For example, :func:!urljoin with relative reference "?" now sets empty query and removes fragment. Preserve empty components (authority, params, query, fragment) in :func:!urljoin. Preserve empty components (authority, params, query) in :func:!urldefrag.

.. date: 2024-08-23-15-49-10 .. gh-issue: 116810 .. nonce: QLBUU8 .. section: Library

Resolve a memory leak introduced in CPython 3.10's :mod:ssl when the :attr:ssl.SSLSocket.session property was accessed. Speeds up read and write access to said property by no longer unnecessarily cloning session objects via serialization.

.. date: 2024-08-22-20-10-13 .. gh-issue: 123243 .. nonce: Kifj1L .. section: Library

Fix memory leak in :mod:!_decimal.

.. date: 2024-08-22-11-25-19 .. gh-issue: 122546 .. nonce: BSmeE7 .. section: Library

Consistently use same file name for different exceptions in the new repl. Patch by Sergey B Kirpichev.

.. date: 2024-08-22-09-37-48 .. gh-issue: 123213 .. nonce: owmXnP .. section: Library

:meth:xml.etree.ElementTree.Element.extend and :class:~xml.etree.ElementTree.Element assignment no longer hide the internal exception if an erroneous generator is passed. Patch by Bar Harel.

.. date: 2024-08-20-18-02-27 .. gh-issue: 85110 .. nonce: 8_iDQy .. section: Library

Preserve relative path in URL without netloc in :func:urllib.parse.urlunsplit and :func:urllib.parse.urlunparse.

.. date: 2024-08-20-14-22-49 .. gh-issue: 123165 .. nonce: vOZZOA .. section: Library

Add support for rendering :class:~dis.Positions in :mod:dis.

.. date: 2024-08-19-17-37-18 .. gh-issue: 122909 .. nonce: kP12SK .. section: Library

In urllib.request when URLError is raised opening an ftp URL, the exception argument is now consistently a string. Earlier versions passed either a string or an ftplib exception instance as the argument to URLError.

.. date: 2024-08-18-08-25-32 .. gh-issue: 123084 .. nonce: rf8izX .. section: Library

Deprecate :class:!shutil.ExecError, which hasn't been raised by any :mod:shutil function since Python 3.4. It's now an alias for :exc:RuntimeError.

.. date: 2024-08-17-08-17-20 .. gh-issue: 123085 .. nonce: 7Io2yH .. section: Library

In a bare call to :func:importlib.resources.files, ensure the caller's frame is properly detected when importlib.resources is itself available as a compiled module only (no source).

.. date: 2024-08-16-19-13-21 .. gh-issue: 123067 .. nonce: Nx9O4R .. section: Library

Fix quadratic complexity in parsing "-quoted cookie values with backslashes by :mod:http.cookies.

.. date: 2024-08-16-16-53-52 .. gh-issue: 123049 .. nonce: izx_fH .. section: Library

Add support for :const:~configparser.UNNAMED_SECTION in :meth:configparser.ConfigParser.add_section.

.. date: 2024-08-15-09-45-34 .. gh-issue: 121735 .. nonce: _1q0qf .. section: Library

When working with zip archives, importlib.resources now properly honors module-adjacent references (e.g. files(pkg.mod) and not just files(pkg)).

.. date: 2024-08-14-10-41-11 .. gh-issue: 122981 .. nonce: BHV0Z9 .. section: Library

Fix :func:inspect.getsource for generated classes with Python base classes (e.g. enums).

.. date: 2024-08-11-14-23-07 .. gh-issue: 122903 .. nonce: xktZta .. section: Library

zipfile.Path.glob now correctly matches directories instead of silently omitting them.

.. date: 2024-08-11-14-08-04 .. gh-issue: 122905 .. nonce: 7tDsxA .. section: Library

:class:zipfile.Path objects now sanitize names from the zipfile.

.. date: 2024-08-10-14-16-59 .. gh-issue: 122873 .. nonce: XlHaUn .. section: Library

Enable :mod:json module to work as a script using the :option:-m switch: python -m json. See the :ref:JSON command-line interface <json-commandline> documentation. Patch by Trey Hunner.

.. date: 2024-08-10-10-21-44 .. gh-issue: 122858 .. nonce: ZC1rJD .. section: Library

Deprecate :func:!asyncio.iscoroutinefunction in favor of :func:inspect.iscoroutinefunction.

.. date: 2024-08-07-17-41-16 .. gh-issue: 116263 .. nonce: EcXir0 .. section: Library

:class:logging.handlers.RotatingFileHandler no longer rolls over empty log files.

.. date: 2024-08-07-14-12-19 .. gh-issue: 105376 .. nonce: QbGPdE .. section: Library

Restore the deprecated :mod:logging warn() method. It was removed in Python 3.13 alpha 1. Keep the deprecated warn() method in Python 3.13. Patch by Victor Stinner.

.. date: 2024-08-07-11-57-41 .. gh-issue: 122311 .. nonce: LDExnJ .. section: Library

Improve errors in the :mod:pickle module. :exc:~pickle.PicklingError is now raised more often instead of :exc:UnicodeEncodeError, :exc:ValueError and :exc:AttributeError, and the original exception is chained to it. Improve and unify error messages in Python and C implementations.

.. date: 2024-08-06-18-07-19 .. gh-issue: 122744 .. nonce: kCzNDI .. section: Library

Bump the version of pip bundled in ensurepip to version 24.2.

.. date: 2024-08-06-10-36-55 .. gh-issue: 118761 .. nonce: q_x_1A .. section: Library

Improve import time of :mod:pprint by around seven times. Patch by Hugo van Kemenade.

.. date: 2024-08-06-07-24-00 .. gh-issue: 118974 .. nonce: qamsCQ .. section: Library

Add decorator parameter to :func:dataclasses.make_dataclass to customize the functional creation of dataclasses.

.. date: 2024-08-04-14-07-18 .. gh-issue: 118814 .. nonce: uiyks1 .. section: Library

Fix the :class:typing.TypeVar constructor when name is passed by keyword.

.. date: 2024-08-03-06-51-08 .. gh-issue: 122637 .. nonce: gpas8J .. section: Library

Adjust cmath.tanh(nanj) and cmath.tanh(infj) for recent C standards.

.. date: 2024-07-31-20-43-21 .. gh-issue: 122478 .. nonce: sCU2Le .. section: Library

Remove internal frames from tracebacks shown in :class:code.InteractiveInterpreter with non-default :func:sys.excepthook. Save correct tracebacks in :data:sys.last_traceback and update __traceback__ attribute of :data:sys.last_value and :data:sys.last_exc.

.. date: 2024-07-31-15-08-42 .. gh-issue: 116622 .. nonce: aKxIQA .. section: Library

On Android, the FICLONE and FICLONERANGE constants are no longer exposed by :mod:fcntl, as these ioctls are blocked by SELinux.

.. date: 2024-07-31-14-55-41 .. gh-issue: 82378 .. nonce: eZvYmR .. section: Library

Make sure that the new :term:REPL interprets :data:sys.tracebacklimit in the same way that the classic REPL did.

.. date: 2024-07-30-21-29-30 .. gh-issue: 122334 .. nonce: LeoE1x .. section: Library

Fix crash when importing :mod:ssl after the main interpreter restarts.

.. date: 2024-07-30-15-57-07 .. gh-issue: 122459 .. nonce: AYIoeN .. section: Library

Optimize :mod:pickling <pickle> by name objects without the __module__ attribute.

.. date: 2024-07-30-14-46-16 .. gh-issue: 87320 .. nonce: -Yk1wb .. section: Library

In :class:code.InteractiveInterpreter, handle exceptions caused by calling a non-default :func:sys.excepthook. Before, the exception bubbled up to the caller, ending the :term:REPL.

.. date: 2024-07-30-04-27-55 .. gh-issue: 122272 .. nonce: 6Wwa1V .. section: Library

On some platforms such as Linux, year with century was not 0-padded when formatted by :meth:~.datetime.strftime with C99-specific specifiers '%C' or '%F'. The 0-padding behavior is now guaranteed when the format specifiers '%C' and '%F' are supported by the C library. Patch by Ben Hsing

.. date: 2024-07-29-16-47-08 .. gh-issue: 122400 .. nonce: fM0YSv .. section: Library

Handle :exc:ValueError\s raised by :func:os.stat in :class:filecmp.dircmp and :func:filecmp.cmpfiles. Patch by Bénédikt Tran.

.. date: 2024-07-29-10-24-48 .. gh-issue: 122311 .. nonce: xChV1b .. section: Library

Fix some error messages in :mod:pickle.

.. date: 2024-07-27-16-10-41 .. gh-issue: 121650 .. nonce: nf6oc9 .. section: Library

:mod:email headers with embedded newlines are now quoted on output. The :mod:~email.generator will now refuse to serialize (write) headers that are unsafely folded or delimited; see :attr:~email.policy.Policy.verify_generated_headers. (Contributed by Bas Bloemsaat and Petr Viktorin in :gh:121650.)

.. date: 2024-07-26-21-21-13 .. gh-issue: 122332 .. nonce: fvw88r .. section: Library

Fixed segfault with :meth:asyncio.Task.get_coro when using an eager task factory.

.. date: 2024-07-25-15-41-14 .. gh-issue: 105733 .. nonce: o3koJA .. section: Library

:func:ctypes.ARRAY is now :term:soft deprecated: it no longer emits deprecation warnings and is not scheduled for removal.

.. date: 2024-07-24-08-48-22 .. gh-issue: 122213 .. nonce: o3pdgA .. section: Library

Add notes for pickle serialization errors that allow to identify the source of the error.

.. date: 2024-07-23-22-26-00 .. gh-issue: 119180 .. nonce: B2IVT8 .. section: Library

As part of :pep:749, add the following attributes for customizing evaluation of annotation scopes:

evaluate_value on :class:typing.TypeAliasType
evaluate_bound, evaluate_constraints, and evaluate_default on :class:typing.TypeVar
evaluate_default on :class:typing.ParamSpec
evaluate_default on :class:typing.TypeVarTuple

.. date: 2024-07-23-17-13-10 .. gh-issue: 119180 .. nonce: 5PZELo .. section: Library

Fix handling of classes with custom metaclasses in annotationlib.get_annotations.

.. date: 2024-07-23-15-30-23 .. gh-issue: 122170 .. nonce: Z9gi3Y .. section: Library

Handle :exc:ValueError\s raised by :func:os.stat in :mod:linecache. Patch by Bénédikt Tran.

.. date: 2024-07-23-15-11-13 .. gh-issue: 122163 .. nonce: 4wRUuM .. section: Library

Add notes for JSON serialization errors that allow to identify the source of the error.

.. date: 2024-07-23-13-07-12 .. gh-issue: 122129 .. nonce: PwbC8q .. section: Library

Improve support of method descriptors and wrappers in the help title.

.. date: 2024-07-23-12-38-14 .. gh-issue: 122145 .. nonce: sTO8nX .. section: Library

Fix an issue when reporting tracebacks corresponding to Python code emitting an empty AST body. Patch by Nikita Sobolev and Bénédikt Tran.

.. date: 2024-07-23-10-59-38 .. gh-issue: 121723 .. nonce: iJEf7e .. section: Library

Make :func:logging.config.dictConfig accept any object implementing the Queue public API. See the :ref:queue configuration <configure-queue> section for details. Patch by Bénédikt Tran.

.. date: 2024-07-23-09-14-44 .. gh-issue: 82951 .. nonce: -F5p5A .. section: Library

Serializing objects with complex __qualname__ (such as unbound methods and nested classes) by name no longer involves serializing parent objects by value in pickle protocols < 4.

.. date: 2024-07-22-08-57-28 .. gh-issue: 120754 .. nonce: Eo5puP .. section: Library

Pathlib.read_bytes no longer opens the file in Python's buffered I/O mode. This reduces overheads as the code reads a file in whole leading to a modest speedup.

.. date: 2024-07-22-08-14-04 .. gh-issue: 113785 .. nonce: 6B_KNB .. section: Library

:mod:csv now correctly parses numeric fields (when used with :const:csv.QUOTE_NONNUMERIC or :const:csv.QUOTE_STRINGS) which start with an escape character.

.. date: 2024-07-21-18-03-30 .. gh-issue: 122088 .. nonce: vi2bP- .. section: Library

:deco:warnings.deprecated now copies the coroutine status of functions and methods so that :func:inspect.iscoroutinefunction returns the correct result.

.. date: 2024-07-21-10-45-24 .. gh-issue: 122081 .. nonce: dNrYMq .. section: Library

Fix a crash in the :func:!decimal.IEEEContext optional function available via the EXTRA_FUNCTIONALITY configuration flag.

.. date: 2024-07-21-02-00-46 .. gh-issue: 73991 .. nonce: pLxdtJ .. section: Library

Add :meth:pathlib.Path.move, which moves a file or directory tree.

.. date: 2024-07-17-12-55-22 .. gh-issue: 121268 .. nonce: 41RmjR .. section: Library

Remove workarounds for non-IEEE 754 systems in :mod:cmath.

.. date: 2024-07-17-09-44-35 .. gh-issue: 119698 .. nonce: WlygzR .. section: Library

Due to the lack of interest for :meth:symtable.Class.get_methods, the method is marked as deprecated and will be removed in Python 3.16. Patch by Bénédikt Tran.

.. date: 2024-07-17-09-23-03 .. gh-issue: 121889 .. nonce: 6se9jS .. section: Library

Adjusts cmath.acosh(complex('0+nanj')) for recent C standards.

.. date: 2024-07-16-20-49-07 .. gh-issue: 121804 .. nonce: gYN-In .. section: Library

Correctly show error locations, when :exc:SyntaxError raised in new repl. Patch by Sergey B Kirpichev.

.. date: 2024-07-15-19-34-56 .. gh-issue: 121797 .. nonce: qDqj59 .. section: Library

Add alternative :class:~fractions.Fraction constructor :meth:Fraction.from_number() <fractions.Fraction.from_number>.

.. date: 2024-07-15-19-25-25 .. gh-issue: 121798 .. nonce: GmuBDu .. section: Library

Add alternative :class:~decimal.Decimal constructor :meth:Decimal.from_number() <decimal.Decimal.from_number>.

.. date: 2024-07-14-11-18-28 .. gh-issue: 120930 .. nonce: Kuo4L0 .. section: Library

Fixed a bug introduced by gh-92081 that added an incorrect extra blank to encoded words occurring in wrapped headers.

.. date: 2024-07-14-06-24-02 .. gh-issue: 57141 .. nonce: C3jhDh .. section: Library

The shallow argument to :class:filecmp.dircmp (new in Python 3.13) is now keyword-only.

.. date: 2024-07-13-06-23-24 .. gh-issue: 121245 .. nonce: RfOgf4 .. section: Library

Simplify handling of the history file in site.register_readline() helper. The CAN_USE_PYREPL variable now will be initialized, when imported. Patch by Sergey B Kirpichev.

.. date: 2024-07-10-08-13-34 .. gh-issue: 121249 .. nonce: W9Gd09 .. section: Library

Support the :c:expr:float complex and :c:expr:double complex C types in the :mod:struct module if the compiler has C11 complex arithmetic. Patch by Sergey B Kirpichev.

.. date: 2024-07-09-12-23-32 .. gh-issue: 121486 .. nonce: Iultjh .. section: Library

:mod:math functions :func:~math.isqrt, :func:~math.log, :func:~math.log2 and :func:~math.log10 now support integers larger than 2**2**32 on 32-bit platforms.

.. date: 2024-07-08-03-45-34 .. gh-issue: 121474 .. nonce: NsvrUN .. section: Library

Fix missing sanity check for parties arg in :class:threading.Barrier constructor. Patch by Clinton Christian (pygeek).

.. date: 2024-07-06-23-39-38 .. gh-issue: 121450 .. nonce: vGqb3c .. section: Library

Hard-coded breakpoints (:func:breakpoint and :func:pdb.set_trace) now reuse the most recent Pdb instance that calls Pdb.set_trace(), instead of creating a new one each time. As a result, all the instance specific data like display and commands are preserved across Hard-coded breakpoints.

.. date: 2024-07-06-16-08-39 .. gh-issue: 119169 .. nonce: o0YymL .. section: Library

Slightly speed up :func:os.walk by simplifying exception handling.

.. date: 2024-07-06-12-37-10 .. gh-issue: 121423 .. nonce: vnxrl4 .. section: Library

Improve import time of :mod:socket by lazy importing modules and writing :data:!socket.errorTab as a constant.

.. date: 2024-07-04-17-36-03 .. gh-issue: 59110 .. nonce: IlI9Fz .. section: Library

:mod:zipimport supports now namespace packages when no directory entry exists.

.. date: 2024-07-03-14-23-04 .. gh-issue: 119004 .. nonce: L5MoUu .. section: Library

Fix a crash in :ref:OrderedDict.__eq__ <collections_OrderedDict__eq__> when operands are mutated during the check. Patch by Bénédikt Tran.

.. date: 2024-07-03-10-11-53 .. gh-issue: 121313 .. nonce: D7gARW .. section: Library

Limit the reading size in the :class:multiprocessing.connection.Connection class to 64 KiB to prevent memory overallocation and unnecessary memory management system calls.

.. date: 2024-07-03-07-25-21 .. gh-issue: 121332 .. nonce: Iz6FEq .. section: Library

Fix constructor of :mod:ast nodes with custom _attributes. Previously, passing custom attributes would raise a :py:exc:DeprecationWarning. Passing arguments to the constructor that are not in _fields or _attributes remains deprecated. Patch by Jelle Zijlstra.

.. date: 2024-07-02-11-34-06 .. gh-issue: 121245 .. nonce: sSkDAr .. section: Library

Fix a bug in the handling of the command history of the new :term:REPL that caused the history file to be wiped at REPL exit.

.. date: 2024-07-01-11-23-18 .. gh-issue: 121210 .. nonce: cD0zfn .. section: Library

Handle AST nodes with missing runtime fields or attributes in :func:ast.compare. Patch by Bénédikt Tran.

.. date: 2024-06-29-19-30-15 .. gh-issue: 121163 .. nonce: SJKDFq .. section: Library

Add support for all as an valid action for :func:warnings.simplefilter and :func:warnings.filterwarnings.

.. date: 2024-06-29-15-23-26 .. gh-issue: 121151 .. nonce: HeLEvq .. section: Library

Fix wrapping of long usage text of arguments inside a mutually exclusive group in :mod:argparse.

.. date: 2024-06-29-15-21-12 .. gh-issue: 121141 .. nonce: 4evD6q .. section: Library

Add support for :func:copy.replace to AST nodes. Patch by Bénédikt Tran.

.. date: 2024-06-29-05-08-59 .. gh-issue: 87744 .. nonce: rpF6Jw .. section: Library

Fix waitpid race while calling :meth:~asyncio.subprocess.Process.send_signal in asyncio. Patch by Kumar Aditya.

.. date: 2024-06-27-13-47-14 .. gh-issue: 121027 .. nonce: jh55EC .. section: Library

Add a future warning in :meth:!functools.partial.__get__. In future Python versions :class:functools.partial will be a method descriptor.

.. date: 2024-06-27-12-27-52 .. gh-issue: 121027 .. nonce: D4K1OX .. section: Library

Make the :class:functools.partial object a method descriptor.

.. date: 2024-06-26-17-00-39 .. gh-issue: 117784 .. nonce: inCtAV .. section: Library

CPython now detects whether its linked TLS library supports TLSv1.3 post-handshake authentication and disables that feature if support is lacking.

.. date: 2024-06-26-10-13-40 .. gh-issue: 121025 .. nonce: M-XXlV .. section: Library

Improve the :meth:~object.__repr__ of :class:functools.partialmethod. Patch by Bénédikt Tran.

.. date: 2024-06-26-03-04-24 .. gh-issue: 121018 .. nonce: clVSc4 .. section: Library

Fixed issues where :meth:!argparse.ArgumentParser.parse_args did not honor exit_on_error=False. Based on patch by Ben Hsing.

.. date: 2024-06-23-17-50-40 .. gh-issue: 119614 .. nonce: vwPGLB .. section: Library

Fix truncation of strings with embedded null characters in some internal operations in :mod:tkinter.

.. date: 2024-06-23-11-21-27 .. gh-issue: 120910 .. nonce: t0QXdB .. section: Library

When reading installed files from an egg, use relative_to(walk_up=True) to honor files installed outside of the installation root.

.. date: 2024-06-23-07-23-08 .. gh-issue: 61103 .. nonce: ca_U_l .. section: Library

Support :c:expr:float complex, :c:expr:double complex and :c:expr:long double complex C types in :mod:ctypes as :class:~ctypes.c_float_complex, :class:~ctypes.c_double_complex and :class:~ctypes.c_longdouble_complex if the compiler has C11 complex arithmetic. Patch by Sergey B Kirpichev.

.. date: 2024-06-22-22-52-24 .. gh-issue: 120888 .. nonce: sd8I3N .. section: Library

Upgrade pip wheel bundled with ensurepip (pip 24.1.1)

.. date: 2024-06-22-22-23-56 .. gh-issue: 101830 .. nonce: 1BAoxH .. section: Library

Accessing the :mod:tkinter object's string representation no longer converts the underlying Tcl object to a string on Windows.

.. date: 2024-06-22-17-01-56 .. gh-issue: 120678 .. nonce: Ik8dCg .. section: Library

Fix regression in the new REPL that meant that globals from files passed using the -i argument would not be included in the REPL's global namespace. Patch by Alex Waygood.

.. date: 2024-06-21-14-32-56 .. gh-issue: 120811 .. nonce: eBmVTV .. section: Library

Fix possible memory leak in :meth:contextvars.Context.run.

.. date: 2024-06-21-12-00-16 .. gh-issue: 120782 .. nonce: LOE8tj .. section: Library

Fix wrong references of the :mod:datetime types after reloading the module.

.. date: 2024-06-21-06-37-46 .. gh-issue: 120713 .. nonce: WBbQx4 .. section: Library

:meth:datetime.datetime.strftime now 0-pads years with less than four digits for the format specifiers %Y and %G on Linux. Patch by Ben Hsing

.. date: 2024-06-20-01-31-24 .. gh-issue: 120769 .. nonce: PfiMrc .. section: Library

Make empty line in :mod:pdb repeats the last command even when the command is from cmdqueue.

.. date: 2024-06-19-23-08-25 .. gh-issue: 120780 .. nonce: 0Omopb .. section: Library

Show string value of LOAD_SPECIAL oparg in :mod:dis output.

.. date: 2024-06-19-19-53-42 .. gh-issue: 41431 .. nonce: gnkUc5 .. section: Library

Add :meth:datetime.time.strptime and :meth:datetime.date.strptime. Contributed by Wannes Boeykens.

.. date: 2024-06-19-15-43-04 .. gh-issue: 120743 .. nonce: CMMl2P .. section: Library

:term:Soft deprecate <soft deprecated> :func:os.popen and :func:os.spawn* <os.spawnl> functions. They should no longer be used to write new code. The :mod:subprocess module is recommended instead. Patch by Victor Stinner.

.. date: 2024-06-19-15-06-58 .. gh-issue: 120732 .. nonce: OvYV9b .. section: Library

Fix name passing to :class:unittest.mock.Mock object when using :func:unittest.mock.create_autospec.

.. date: 2024-06-19-13-20-01 .. gh-issue: 111259 .. nonce: Wki5PV .. section: Library

:mod:re now handles patterns like "[\s\S]" or "\s|\S" which match any character as effectively as a dot with the DOTALL modifier ("(?s:.)").

.. date: 2024-06-18-19-18-10 .. gh-issue: 120683 .. nonce: xmRez7 .. section: Library

Fix an error in :class:logging.LogRecord, when the integer part of the timestamp is rounded up, while the millisecond calculation truncates, causing the log timestamp to be wrong by up to 999 ms (affected roughly 1 in 8 million timestamps).

.. date: 2024-06-18-14-45-38 .. gh-issue: 118710 .. nonce: 5GZZPX .. section: Library

:class:ipaddress.IPv4Address and :class:ipaddress.IPv6Address attributes version and max_prefixlen are now available on the class.

.. date: 2024-06-17-20-04-13 .. gh-issue: 120633 .. nonce: kZC5wt .. section: Library

Move scrollbar and remove tear-off menus in turtledemo.

.. date: 2024-06-16-21-33-56 .. gh-issue: 120606 .. nonce: kugbwR .. section: Library

Allow users to use EOF to exit commands definition in :mod:pdb

.. date: 2024-06-15-23-38-36 .. gh-issue: 120284 .. nonce: HwsAtY .. section: Library

Allow :meth:asyncio.Runner.run to accept :term:awaitable objects instead of simply :term:coroutine\s.

.. date: 2024-06-15-12-04-46 .. gh-issue: 120541 .. nonce: d3cc5y .. section: Library

Improve the prompt in the "less" pager when :func:help is called with non-string argument.

.. date: 2024-06-14-20-05-25 .. gh-issue: 120495 .. nonce: OxgZKB .. section: Library

Fix incorrect exception handling in Tab Nanny. Patch by Wulian233.

.. date: 2024-06-12-15-07-58 .. gh-issue: 120388 .. nonce: VuTQMT .. section: Library

Improve a warning message when a test method in :mod:unittest returns something other than None. Now we show the returned object type and optional asyncio-related tip.

.. date: 2024-06-12-11-54-05 .. gh-issue: 120381 .. nonce: O-BNLs .. section: Library

Correct :func:inspect.ismethoddescriptor to check also for the lack of :meth:~object.__delete__. Patch by Jan Kaliszewski.

.. date: 2024-06-12-10-00-31 .. gh-issue: 90425 .. nonce: 5CfkKG .. section: Library

The OS byte in gzip headers is now always set to 255 when using :func:gzip.compress.

.. date: 2024-06-11-16-34-41 .. gh-issue: 120343 .. nonce: hdiXeU .. section: Library

Fix column offset reporting for tokens that come after multiline f-strings in the :mod:tokenize module.

.. date: 2024-06-11-07-17-25 .. gh-issue: 119180 .. nonce: iH-2zy .. section: Library

As part of implementing :pep:649 and :pep:749, add a new module annotationlib. Add support for unresolved forward references in annotations to :mod:dataclasses, :class:typing.TypedDict, and :class:typing.NamedTuple.

.. date: 2024-06-10-14-00-40 .. gh-issue: 119600 .. nonce: jJMf4C .. section: Library

Fix :func:unittest.mock.patch to not read attributes of the target when new_callable is set. Patch by Robert Collins.

.. date: 2024-06-09-19-53-11 .. gh-issue: 120289 .. nonce: s4HXR0 .. section: Library

Fixed the use-after-free issue in :mod:!cProfile by disallowing disable() and clear() in external timers.

.. date: 2024-06-08-17-41-11 .. gh-issue: 82017 .. nonce: WpSTGi .. section: Library

Added support for converting any objects that have the :meth:!as_integer_ratio method to a :class:~fractions.Fraction.

.. date: 2024-06-08-15-46-35 .. gh-issue: 114053 .. nonce: Ub2XgJ .. section: Library

Fix edge-case bug where :func:typing.get_type_hints would produce incorrect results if type parameters in a class scope were overridden by assignments in a class scope and from __future__ import annotations semantics were enabled. Patch by Alex Waygood.

.. date: 2024-06-08-15-15-29 .. gh-issue: 114053 .. nonce: WQLAFG .. section: Library

Fix erroneous :exc:NameError when calling :func:inspect.get_annotations with eval_str=True``` on a class that made use of :pep:`695` type parameters in a module that had from future import annotations`` at the top of the file. Patch by Alex Waygood.

.. date: 2024-06-08-14-36-40 .. gh-issue: 120268 .. nonce: MNpd1q .. section: Library

Prohibit passing None to pure-Python :meth:datetime.date.fromtimestamp to achieve consistency with C-extension implementation.

.. date: 2024-06-08-09-45-31 .. gh-issue: 120244 .. nonce: 8o9Dzr .. section: Library

Fix memory leak in :func:re.sub when the replacement string contains backreferences.

.. date: 2024-06-08-03-29-01 .. gh-issue: 120254 .. nonce: h682ke .. section: Library

Added commands argument to :func:pdb.set_trace which allows users to send debugger commands from the source file.

.. date: 2024-06-07-13-21-11 .. gh-issue: 120211 .. nonce: Rws_gf .. section: Library

Fix :mod:tkinter.ttk with Tcl/Tk 9.0.

.. date: 2024-06-07-11-23-31 .. gh-issue: 71587 .. nonce: IjFajE .. section: Library

Fix crash in C version of :meth:datetime.datetime.strptime when called again on the restarted interpreter.

.. date: 2024-06-07-10-10-32 .. gh-issue: 117983 .. nonce: NeMR9n .. section: Library

Defer the threading import in importlib.util until lazy loading is used.

.. date: 2024-06-07-02-00-31 .. gh-issue: 120157 .. nonce: HnWcF9 .. section: Library

Remove unused constant concurrent.futures._base._FUTURE_STATES in :mod:concurrent.futures. Patch by Clinton Christian (pygeek).

.. date: 2024-06-06-17-24-43 .. gh-issue: 120161 .. nonce: DahNXV .. section: Library

:mod:datetime no longer crashes in certain complex reference cycle situations.

.. date: 2024-06-06-12-07-57 .. gh-issue: 119698 .. nonce: rRrprk .. section: Library

Fix :meth:symtable.Class.get_methods and document its behaviour. Patch by Bénédikt Tran.

.. date: 2024-06-05-16-30-28 .. gh-issue: 120121 .. nonce: 9dz8i7 .. section: Library

Add :exc:concurrent.futures.InvalidStateError to module's __all__.

.. date: 2024-06-05-11-39-21 .. gh-issue: 119933 .. nonce: ooJXQV .. section: Library

Add the :class:symtable.SymbolTableType enumeration to represent the possible outputs of the :class:symtable.SymbolTable.get_type method. Patch by Bénédikt Tran.

.. date: 2024-06-05-11-03-10 .. gh-issue: 120029 .. nonce: QBsw47 .. section: Library

Expose :class:symtable.Symbol methods :meth:~symtable.Symbol.is_free_class, :meth:~symtable.Symbol.is_comp_iter and :meth:~symtable.Symbol.is_comp_cell. Patch by Bénédikt Tran.

.. date: 2024-06-05-08-02-46 .. gh-issue: 120108 .. nonce: 4U9BL8 .. section: Library

Fix calling :func:copy.deepcopy on :mod:ast trees that have been modified to have references to parent nodes. Patch by Jelle Zijlstra.

.. date: 2024-06-04-19-49-16 .. gh-issue: 120056 .. nonce: 5aqozw .. section: Library

Add :data:!socket.IP_RECVERR and :data:!socket.IP_RECVTTL constants (both available since Linux 2.2). And :data:!socket.IP_RECVORIGDSTADDR constant (available since Linux 2.6.29).

.. date: 2024-06-04-19-03-25 .. gh-issue: 112672 .. nonce: K2XfZH .. section: Library

Support building :mod:tkinter with Tcl 9.0.

.. date: 2024-06-04-18-53-10 .. gh-issue: 120057 .. nonce: RSD9_Z .. section: Library

Added the :data:os.environ.refresh() <os.environ> method to update :data:os.environ with changes to the environment made by :func:os.putenv, by :func:os.unsetenv, or made outside Python in the same process. Patch by Victor Stinner.

.. date: 2024-06-04-14-54-46 .. gh-issue: 120029 .. nonce: _1YdTf .. section: Library

Expose :meth:symtable.Symbol.is_type_parameter in the :mod:symtable module. Patch by Bénédikt Tran.

.. date: 2024-06-04-12-23-01 .. gh-issue: 119819 .. nonce: WKKrYh .. section: Library

Fix regression to allow logging configuration with multiprocessing queue types.

.. date: 2024-06-04-08-57-02 .. gh-issue: 65454 .. nonce: o9j4wF .. section: Library

:func:unittest.mock.Mock.attach_mock no longer triggers a call to a PropertyMock being attached.

.. date: 2024-06-03-11-18-16 .. gh-issue: 117142 .. nonce: kWTXQo .. section: Library

The :mod:ctypes module may now be imported in all subinterpreters, including those that have their own GIL.

.. date: 2024-06-02-15-09-17 .. gh-issue: 118835 .. nonce: KUAuz6 .. section: Library

Fix _pyrepl crash when using custom prompt with ANSI escape codes.

.. date: 2024-06-02-13-35-11 .. gh-issue: 81936 .. nonce: ETeW9x .. section: Library

:meth:!help and :meth:!showtopic methods now respect a configured output argument to :class:!pydoc.Helper and not use the pager in such cases. Patch by Enrico Tröger.

.. date: 2024-06-01-16-58-43 .. gh-issue: 117398 .. nonce: kR0RW7 .. section: Library

The _datetime module (C implementation for :mod:datetime) now supports being imported in multiple interpreters.

.. date: 2024-05-31-21-17-43 .. gh-issue: 119824 .. nonce: CQlxWV .. section: Library

Print stack entry in :mod:pdb when and only when user input is needed.

.. date: 2024-05-31-13-56-21 .. gh-issue: 119838 .. nonce: H6XHlE .. section: Library

In mixed arithmetic operations with :class:~fractions.Fraction and complex, the fraction is now converted to :class:float instead of :class:complex.

.. date: 2024-05-31-12-57-31 .. gh-issue: 119770 .. nonce: NCtels .. section: Library

Make :mod:termios ioctl() constants positive. Patch by Victor Stinner.

.. date: 2024-05-30-21-37-05 .. gh-issue: 89727 .. nonce: D6S9ig .. section: Library

Fix issue with :func:shutil.rmtree where a :exc:RecursionError is raised on deep directory trees.

.. date: 2024-05-29-21-50-05 .. gh-issue: 119577 .. nonce: S3BlKJ .. section: Library

The :exc:DeprecationWarning emitted when testing the truth value of an :class:xml.etree.ElementTree.Element now describes unconditionally returning True in a future version rather than raising an exception in Python 3.14.

.. date: 2024-05-29-20-42-17 .. gh-issue: 89727 .. nonce: 5lPTTW .. section: Library

Partially fix issue with :func:shutil.rmtree where a :exc:RecursionError is raised on deep directory trees. A recursion error is no longer raised when :data:!rmtree.avoids_symlink_attacks is false.

.. date: 2024-05-29-12-42-40 .. gh-issue: 93963 .. nonce: cb1oJS .. section: Library

Remove deprecated names from importlib.abc as found in importlib.resources.abc.

.. date: 2024-05-28-12-15-03 .. gh-issue: 119118 .. nonce: FMKz1F .. section: Library

Fix performance regression in the :mod:tokenize module by caching the line token attribute and calculating the column offset more efficiently.

.. date: 2024-05-28-00-56-59 .. gh-issue: 89727 .. nonce: _bxoL3 .. section: Library

Fix issue with :func:os.fwalk where a :exc:RecursionError was raised on deep directory trees by adjusting the implementation to be iterative instead of recursive.

.. date: 2024-05-26-22-22-51 .. gh-issue: 119594 .. nonce: fnQNM8 .. section: Library

If one calls pow(fractions.Fraction, x, module) with modulo not None, the error message now says that the types are incompatible rather than saying pow only takes 2 arguments. Patch by Wim Jeantine-Glenn and Mark Dickinson.

.. date: 2024-05-26-21-28-11 .. gh-issue: 119588 .. nonce: wlLBK5 .. section: Library

zipfile.Path.is_symlink now assesses if the given path is a symlink.

.. date: 2024-05-25-20-20-42 .. gh-issue: 119562 .. nonce: DyplWc .. section: Library

Remove :class:!ast.Num, :class:!ast.Str, :class:!ast.Bytes, :class:!ast.NameConstant and :class:!ast.Ellipsis. They had all emitted deprecation warnings since Python 3.12. Patch by Alex Waygood.

.. date: 2024-05-25-20-15-26 .. gh-issue: 119555 .. nonce: mvHbEL .. section: Library

Catch :exc:SyntaxError from :func:compile in the runsource() method of the InteractiveColoredConsole. Patch by Sergey B Kirpichev.

.. date: 2024-05-25-10-40-38 .. gh-issue: 118908 .. nonce: XcZiq4 .. section: Library

Limit exposed globals from internal imports and definitions on new REPL startup. Patch by Eugene Triguba and Pablo Galindo.

.. date: 2024-05-25-07-25-07 .. gh-issue: 117865 .. nonce: 1A0Xpi .. section: Library

Improve the import time of the :mod:ast module by deferring the import of :mod:re. Patch by Jelle Zijlstra.

.. date: 2024-05-25-00-54-26 .. gh-issue: 119127 .. nonce: LpPvag .. section: Library

Positional arguments of :func:functools.partial objects now support placeholders via :data:functools.Placeholder.

.. date: 2024-05-24-21-54-55 .. gh-issue: 113892 .. nonce: JKDFqq .. section: Library

Now, the method sock_connect of :class:asyncio.ProactorEventLoop raises a :exc:ValueError if given socket is not in non-blocking mode, as well as in other loop implementations.

.. date: 2024-05-24-14-32-24 .. gh-issue: 119506 .. nonce: -nMNqq .. section: Library

Fix :meth:!io.TextIOWrapper.write method breaks internal buffer when the method is called again during flushing internal buffer.

.. date: 2024-05-24-11-47-08 .. gh-issue: 69214 .. nonce: Grl6zF .. section: Library

Fix fcntl.ioctl() request parameter: use an unsigned long instead of an unsigned int for the request parameter of :func:fcntl.ioctl to support requests larger than UINT_MAX. Patch by Victor Stinner.

.. date: 2024-05-24-04-05-37 .. gh-issue: 119105 .. nonce: aDSRFn .. section: Library

difflib's DIffer.compare() (and so also ndiff) can no longer be provoked into cubic-time behavior, or into unbounded recursion, and should generally be faster in ordinary cases too. Results may change in some cases, although that should be rare. Correctness of diffs is not affected. Some similar lines far apart may be reported as deleting one and adding the other, where before they were displayed on adjacent output lines with markup showing the intraline differences.

.. date: 2024-05-23-22-29-59 .. gh-issue: 119443 .. nonce: KAGz6S .. section: Library

The interactive REPL no longer runs with from __future__ import annotations enabled. Patch by Jelle Zijlstra.

.. date: 2024-05-23-15-48-17 .. gh-issue: 119461 .. nonce: 82KqUW .. section: Library

Add socket.VMADDR_CID_LOCAL constant. Patch by Victor Stinner.

.. date: 2024-05-23-11-52-36 .. gh-issue: 117398 .. nonce: 2FG1Mk .. section: Library

Objects in the datetime C-API are now all statically allocated, which means better memory safety, especially when the module is reloaded. This should be transparent to users.

.. date: 2024-05-22-21-20-43 .. gh-issue: 118894 .. nonce: xHdxR_ .. section: Library

:mod:asyncio REPL now has the same capabilities as PyREPL.

.. date: 2024-05-21-23-39-22 .. gh-issue: 118830 .. nonce: YTqvEo .. section: Library

Bump :mod:pickle default protocol to 5.

.. date: 2024-05-21-20-13-23 .. gh-issue: 118911 .. nonce: iG8nMq .. section: Library

In PyREPL, updated maybe-accept's logic so that if the user hits :kbd:Enter twice, they are able to terminate the block even if there's trailing whitespace. Also, now when the user hits arrow up, the cursor is on the last functional line. This matches IPython's behavior. Patch by Aya Elsayed.

.. date: 2024-05-21-19-10-30 .. gh-issue: 115225 .. nonce: eRmfJH .. section: Library

Raise error on certain technically valid but pathological ISO 8601 strings passed to :meth:datetime.time.fromisoformat that were previously parsed incorrectly.

.. date: 2024-05-20-20-30-57 .. gh-issue: 111201 .. nonce: DAA5lC .. section: Library

Remove dependency to :mod:readline from the new Python REPL.

.. date: 2024-05-20-13-48-37 .. gh-issue: 119189 .. nonce: dhJVs5 .. section: Library

When using the ** operator or :func:pow with :class:~fractions.Fraction as the base and an exponent that is not rational, a float, or a complex, the fraction is no longer converted to a float.

.. date: 2024-05-19-18-49-04 .. gh-issue: 119174 .. nonce: 5GTv7d .. section: Library

Fix high DPI causes turtledemo(turtle-graphics examples) windows blurry Patch by Wulian233 and Terry Jan Reedy

.. date: 2024-05-19-13-05-59 .. gh-issue: 119121 .. nonce: P1gnh1 .. section: Library

Fix a NameError happening in asyncio.staggered.staggered_race. This function is now tested.

.. date: 2024-05-19-12-25-36 .. gh-issue: 119105 .. nonce: VcR4ig .. section: Library

difflib.Differ is much faster for some cases of diffs where many pairs of lines are equally similar.

.. date: 2024-05-17-17-32-12 .. gh-issue: 119113 .. nonce: kEv1Ll .. section: Library

Fix issue where :meth:pathlib.PurePath.with_suffix didn't raise :exc:TypeError when given None as a suffix.

.. date: 2024-05-16-17-31-46 .. gh-issue: 118643 .. nonce: hAWH4C .. section: Library

Fix an AttributeError in the :mod:email module when re-fold a long address list. Also fix more cases of incorrect encoding of the address separator in the address list.

.. date: 2024-05-15-01-36-08 .. gh-issue: 73991 .. nonce: CGknDf .. section: Library

Add :meth:pathlib.Path.copy, which copies a file or directory to another.

.. date: 2024-05-12-21-38-42 .. gh-issue: 58933 .. nonce: 0kgU2l .. section: Library

Make :mod:pdb return to caller frame correctly when f_trace of the caller frame is not set

.. date: 2024-05-11-20-23-45 .. gh-issue: 82805 .. nonce: F9bz4J .. section: Library

Support single-dot file extensions in :attr:pathlib.PurePath.suffix and related attributes and methods. For example, the :attr:~pathlib.PurePath.suffixes of PurePath('foo.bar.') are now ['.bar', '.'] rather than []. This brings file extension splitting in line with :func:os.path.splitext.

.. date: 2024-05-10-22-59-01 .. gh-issue: 118924 .. nonce: 9nyvSH .. section: Library

Remove :data:!version and :data:!version_info from :mod:sqlite3. Patch by Hugo van Kemenade.

.. date: 2024-05-10-22-36-01 .. gh-issue: 118928 .. nonce: IW7Ukv .. section: Library

Disallow using a sequence of parameters with named placeholders in :mod:sqlite3 queries. Patch by Erlend E. Aasland.

.. date: 2024-05-10-05-24-32 .. gh-issue: 118895 .. nonce: wUm5r2 .. section: Library

Setting attributes on :data:typing.NoDefault now raises :exc:AttributeError instead of :exc:TypeError.

.. date: 2024-05-09-21-36-11 .. gh-issue: 118868 .. nonce: uckxxP .. section: Library

Fixed issue where kwargs were no longer passed to the logging handler QueueHandler

.. date: 2024-05-09-12-33-25 .. gh-issue: 118827 .. nonce: JrzHz1 .. section: Library

Remove deprecated :class:!Quoter class from :mod:urllib.parse. It had previously raised a :exc:DeprecationWarning since Python 3.11. Patch by Nikita Sobolev.

.. date: 2024-05-09-11-50-26 .. gh-issue: 118824 .. nonce: -jBJQC .. section: Library

Remove deprecated :func:!pty.master_open and :func:!pty.slave_open. Use :func:pty.openpty instead. Patch by Nikita Sobolev.

.. date: 2024-05-09-08-46-12 .. gh-issue: 118851 .. nonce: aPAoJw .. section: Library

ctx arguments to the constructors of :mod:ast node classes now default to :class:ast.Load() <ast.Load>. Patch by Jelle Zijlstra.

.. date: 2024-05-09-02-43-37 .. gh-issue: 101588 .. nonce: 30bNAr .. section: Library

Remove copy, deepcopy, and pickle from itertools. These had previously raised a DeprecationWarning since Python 3.12.

.. date: 2024-05-09-01-05-52 .. gh-issue: 118805 .. nonce: N7dm07 .. section: Library

Remove type, choices, and metavar parameters of :class:!argparse.BooleanOptionalAction. They were deprecated since Python 3.12.

.. date: 2024-05-09-00-52-30 .. gh-issue: 118803 .. nonce: Wv3AvU .. section: Library

:class:!typing.ByteString and :class:!collections.abc.ByteString are removed. They had previously raised a :exc:DeprecationWarning since Python 3.12.

.. date: 2024-05-08-23-16-50 .. gh-issue: 118798 .. nonce: Q_ybqP .. section: Library

The isdst parameter has been removed from :func:email.utils.localtime. Patch by Hugo van Kemenade.

.. date: 2024-05-08-21-30-33 .. gh-issue: 118760 .. nonce: XvyMHn .. section: Library

Restore the default value of tkiter.wantobjects to 1.

.. date: 2024-05-08-21-13-56 .. gh-issue: 118760 .. nonce: mdmH3T .. section: Library

Fix errors in calling Tkinter bindings on Windows.

.. date: 2024-05-08-20-41-48 .. gh-issue: 74033 .. nonce: YebHZj .. section: Library

Drop support for passing keyword arguments to :class:pathlib.Path.

.. date: 2024-05-08-19-47-34 .. gh-issue: 101357 .. nonce: e4R_9x .. section: Library

Suppress all :exc:OSError exceptions from :meth:pathlib.Path.exists and is_*() methods, rather than a selection of more common errors. The new behaviour is consistent with :func:os.path.exists, :func:os.path.isdir, etc. Use :meth:pathlib.Path.stat to retrieve the file status without suppressing exceptions.

.. date: 2024-05-08-18-59-19 .. gh-issue: 78707 .. nonce: _Lz1sw .. section: Library

Drop support for passing additional positional arguments to :meth:pathlib.PurePath.relative_to and :meth:~pathlib.PurePath.is_relative_to.

.. date: 2024-05-08-18-33-07 .. gh-issue: 118507 .. nonce: OCQsAY .. section: Library

Fix :func:os.path.isfile on Windows for pipes. Speedup :func:os.path.isjunction and :func:os.path.lexists on Windows with a native implementation.

.. date: 2024-05-08-09-21-49 .. gh-issue: 118772 .. nonce: c16E8X .. section: Library

Allow :class:typing.TypeVar instances without a default to follow instances without a default in some cases. Patch by Jelle Zijlstra.

.. date: 2024-05-07-17-38-53 .. gh-issue: 118714 .. nonce: XXKpVZ .. section: Library

Allow restart in post-mortem debugging of :mod:pdb. Removed restart message when the user quits pdb from post-mortem mode.

.. date: 2024-05-06-17-39-52 .. gh-issue: 118673 .. nonce: sTXBit .. section: Library

Removed executable bits and shebang from stdlib modules.

.. date: 2024-05-01-22-24-05 .. gh-issue: 110863 .. nonce: GjYBbq .. section: Library

:func:os.path.realpath now suppresses any :exc:OSError from :func:os.readlink when strict mode is disabled (the default).

.. date: 2024-04-28-19-51-00 .. gh-issue: 118263 .. nonce: Gaap3S .. section: Library

Speed up :func:os.path.splitroot & :func:os.path.normpath with a direct C call.

.. date: 2024-04-24-16-23-04 .. gh-issue: 110190 .. nonce: TGd5qx .. section: Library

Fix ctypes structs with array on SPARC by setting MAX_STRUCT_SIZE to 32 in stgdict. Patch by Jakub Kulik

.. date: 2024-04-19-14-59-53 .. gh-issue: 118033 .. nonce: amS4Gw .. section: Library

Fix :func:dataclasses.dataclass not creating a __weakref__ slot when subclassing :class:typing.Generic.

.. date: 2024-04-19-05-58-50 .. gh-issue: 117766 .. nonce: J3xepp .. section: Library

Always use :func:str to print choices in :mod:argparse.

.. date: 2024-03-19-21-41-31 .. gh-issue: 106531 .. nonce: Mgd--6 .. section: Library

In :mod:importlib.resources, sync with importlib_resources 6.3.2 <https://importlib-resources.readthedocs.io/en/latest/history.html#v6-3-2>_, including: MultiplexedPath now expects Traversable paths, deprecating string arguments to MultiplexedPath; Enabled support for resources in namespace packages in zip files; Fixed NotADirectoryError when calling files on a subdirectory of a namespace package.

.. date: 2024-02-27-10-22-15 .. gh-issue: 115937 .. nonce: 0cVNur .. section: Library

Removed extra preprocessing for the __signature__ attribute: the code just check if it's a :class:inspect.Signature instance. Patch by Sergey B Kirpichev.

.. date: 2024-02-22-10-12-59 .. gh-issue: 115808 .. nonce: F2g2Ku .. section: Library

Add :func:operator.is_none and :func:operator.is_not_none functions.

.. date: 2024-01-18-21-44-23 .. gh-issue: 114264 .. nonce: DBKn29 .. section: Library

Improve performance of :func:copy.deepcopy by adding a fast path for atomic types.

.. date: 2024-01-14-11-43-31 .. gh-issue: 113878 .. nonce: dmEIN3 .. section: Library

Add doc parameter to :func:dataclasses.field, so it can be stored and shown as a documentation / metadata. If @dataclass(slots=True) is used, then the supplied string is available in the :attr:~object.__slots__ dict. Otherwise, the supplied string is only available in the corresponding :class:dataclasses.Field object.

In order to support this feature we are changing the __slots__ format in dataclasses from :class:tuple to :class:dict when documentation / metadata is present.

.. date: 2024-01-12-08-51-03 .. gh-issue: 113978 .. nonce: MqTgB0 .. section: Library

Ignore warnings on text completion inside REPL.

.. date: 2023-12-14-13-43-27 .. gh-issue: 113008 .. nonce: jWYn8T .. section: Library

Correct argparse usage output for required, mutually exclusive groups containing a positional argument

.. date: 2023-12-12-15-19-58 .. gh-issue: 108172 .. nonce: KyDPuG .. section: Library

webbrowser honors OS preferred browser on Linux when its desktop entry name contains the text of a known browser name.

.. date: 2023-09-19-17-56-24 .. gh-issue: 109109 .. nonce: WJvvX2 .. section: Library

You can now get the raw TLS certificate chains from TLS connections via :meth:ssl.SSLSocket.get_verified_chain and :meth:ssl.SSLSocket.get_unverified_chain methods.

Contributed by Mateusz Nowak.

.. date: 2023-06-17-09-07-06 .. gh-issue: 105623 .. nonce: 5G06od .. section: Library

Fix performance degradation in :class:logging.handlers.RotatingFileHandler. Patch by Craig Robson.

.. date: 2023-06-16-14-52-00 .. gh-issue: 102450 .. nonce: MfeR6A .. section: Library

Add missing ISO-8601 24:00 alternative to midnight of next day to :meth:datetime.datetime.fromisoformat and :meth:datetime.time.fromisoformat. Patch by Izan "TizzySaurus" Robinson ([email protected])

.. date: 2023-04-28-09-54-15 .. gh-issue: 103956 .. nonce: EyLDPS .. section: Library

Fix lack of newline characters in :mod:trace module output when line tracing is enabled but source code line for current frame is not available.

.. date: 2023-04-26-22-24-17 .. gh-issue: 92081 .. nonce: V8xMot .. section: Library

Fix missing spaces in email headers when the spaces are mixed with encoded 8-bit characters.

.. date: 2023-04-24-05-34-23 .. gh-issue: 103194 .. nonce: GwBwWL .. section: Library

Prepare Tkinter for C API changes in Tcl 8.7/9.0 to avoid :class:!_tkinter.Tcl_Obj being unexpectedly returned instead of :class:bool, :class:str, :class:bytearray, or :class:int.

.. date: 2023-04-10-00-04-37 .. gh-issue: 87106 .. nonce: UyBnPQ .. section: Library

Fixed handling in :meth:inspect.Signature.bind of keyword arguments having the same name as positional-only arguments when a variadic keyword argument (e.g. **kwargs) is present.

.. date: 2023-03-30-18-19-53 .. gh-issue: 103134 .. nonce: bHrn91 .. section: Library

Add additional methods to :ref:proxy objects <multiprocessing-proxy_objects> in the :mod:!multiprocessing module:

:meth:!clear and :meth:!copy for proxies of :class:list
:meth:~dict.fromkeys, reversed(d), d | {}, {} | d, d |= {'b': 2} for proxies of :class:dict

.. bpo: 45767 .. date: 2022-03-10-16-47-57 .. nonce: ywmyo1 .. section: Library

Fix integer conversion in :func:os.major, :func:os.minor, and :func:os.makedev. Support device numbers larger than 2**63-1. Support non-existent device number (NODEV).

.. bpo: 44864 .. date: 2021-08-24-19-37-46 .. nonce: KzxaDh .. section: Library

Do not translate user-provided strings in :class:argparse.ArgumentParser.

.. bpo: 41843 .. date: 2020-12-22-18-08-12 .. nonce: q9Nh2r .. section: Library

Solaris now uses :func:os.sendfile fast-copy syscall for more efficient :mod:shutil file copy related functions.

.. bpo: 15987 .. date: 2020-03-28-21-00-54 .. nonce: aBL8XS .. section: Library

Implemented :func:ast.compare for comparing two ASTs. Patch by Batuhan Taskaya with some help from Jeremy Hylton.

.. date: 2019-08-27-01-16-50 .. gh-issue: 67693 .. nonce: 4NIAiy .. section: Library

Fix :func:urllib.parse.urlunparse and :func:urllib.parse.urlunsplit for URIs with path starting with multiple slashes and no authority. Based on patch by Ashwin Ramaswami.

.. bpo: 14074 .. date: 2018-12-04-07-36-27 .. nonce: fMLKCu .. section: Library

Fix :mod:argparse metavar processing to allow positional arguments to have a tuple metavar.

.. date: 2024-10-04-15-34-34 .. gh-issue: 122392 .. nonce: V8K3w2 .. section: IDLE

Increase currently inadequate vertical spacing for the IDLE browsers (path, module, and stack) on high-resolution monitors.

.. date: 2024-09-21-23-12-18 .. gh-issue: 112938 .. nonce: OeiDru .. section: IDLE

Fix uninteruptable hang when Shell gets rapid continuous output.

.. date: 2024-07-30-18-02-55 .. gh-issue: 122482 .. nonce: TerE0g .. section: IDLE

Change About IDLE to direct users to discuss.python.org instead of the now unused idle-dev email and mailing list.

.. date: 2024-07-16-16-57-03 .. gh-issue: 78889 .. nonce: U7ghFD .. section: IDLE

Stop Shell freezes by blocking user access to non-method sys.stdout.shell attributes, which are all private.

.. date: 2024-06-16-21-42-45 .. gh-issue: 120083 .. nonce: nczuyv .. section: IDLE

Add explicit black IDLE Hovertip foreground color needed for recent macOS. Fixes Sonoma showing unreadable white on pale yellow. Patch by John Riggles.

.. date: 2024-06-05-14-54-24 .. gh-issue: 120104 .. nonce: j_thj4 .. section: IDLE

Fix padding in config and search dialog windows in IDLE.

.. date: 2024-10-10-02-56-24 .. gh-issue: 124872 .. nonce: 0mDDOq .. section: Documentation

Added definitions for :term:context, :term:current context, and :term:context management protocol, updated related definitions to be consistent, and expanded the documentation for :class:contextvars.Context.

.. date: 2024-10-07-00-31-17 .. gh-issue: 125018 .. nonce: yKnymn .. section: Documentation

The :mod:importlib.metadata documentation now includes semantic cross-reference targets for the significant documented APIs. This means intersphinx references like :func:importlib.metadata.version will now work as expected.

.. date: 2024-09-27-16-47-48 .. gh-issue: 124720 .. nonce: nVSTVb .. section: Documentation

Update "Using Python on a Mac" section of the "Python Setup and Usage" document and include information on installing free-threading support.

.. date: 2024-09-24-11-52-36 .. gh-issue: 124457 .. nonce: yrCjSV .. section: Documentation

Remove coverity scan from the CPython repo. It has not been used since 2020 and is currently unmaintained.

.. date: 2024-09-19-19-33-25 .. gh-issue: 116622 .. nonce: M65UZ6 .. section: Documentation

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

.. date: 2024-09-11-16-52-08 .. gh-issue: 123976 .. nonce: jhOfNR .. section: Documentation

Refresh docs around custom providers.

.. date: 2024-08-01-17-18-21 .. gh-issue: 70870 .. nonce: fZnBM9 .. section: Documentation

Clarified the dual usage of the term "free variable" (both the formal meaning of any reference to names defined outside the local scope, and the narrower pragmatic meaning of nonlocal variables named in co_freevars).

.. date: 2024-07-19-12-22-48 .. gh-issue: 121277 .. nonce: wF_zKd .. section: Documentation

Writers of CPython's documentation can now use next as the version for the versionchanged, versionadded, deprecated directives.

.. date: 2024-07-14-12-25-53 .. gh-issue: 117765 .. nonce: YFMOUv .. section: Documentation

Improved documentation for :func:unittest.mock.patch.dict

.. date: 2024-07-14-11-48-10 .. gh-issue: 121749 .. nonce: nxHoTk .. section: Documentation

Fix documentation for :c:func:PyModule_AddObjectRef.

.. date: 2024-06-05-12-36-18 .. gh-issue: 120012 .. nonce: f14DbQ .. section: Documentation

Clarify the behaviours of :meth:multiprocessing.Queue.empty and :meth:multiprocessing.SimpleQueue.empty on closed queues. Patch by Bénédikt Tran.

.. date: 2024-06-03-22-06-26 .. gh-issue: 119574 .. nonce: Ik9kOO .. section: Documentation

Added some missing environment variables to the output of :option:--help-env.

.. bpo: 34008 .. date: 2018-07-04-20-35-25 .. nonce: bqecIb .. section: Documentation

The :c:func:Py_Main documentation moved from the "Very High Level API" section to the "Initialization and Finalization" section.

Also make it explicit that we expect Py_Main to typically be called instead of Py_Initialize rather than after it (since Py_Main makes its own call to Py_Initialize). Document that calling both is supported but is version dependent on which settings will be applied correctly.

.. date: 2024-10-15-15-29-41 .. gh-issue: 124375 .. nonce: wNrWVa .. section: Core and Builtins

Fix a crash in the free threading build when the GC runs concurrently with a new thread starting.

.. date: 2024-10-10-14-47-13 .. gh-issue: 125221 .. nonce: nfSQzT .. section: Core and Builtins

Fix possible race condition when calling :meth:~object.__reduce_ex__ for the first time in the free threading build.

.. date: 2024-10-10-12-04-56 .. gh-issue: 125174 .. nonce: _8h6T7 .. section: Core and Builtins

Make the handling of reference counts of immortal objects more robust. Immortal objects with reference counts that deviate from their original reference count by up to a billion (half a billion on 32 bit builds) are still counted as immortal.

.. date: 2024-10-07-23-33-18 .. gh-issue: 125039 .. nonce: MKTyNI .. section: Core and Builtins

Make this_instr and prev_instr const in cases generator.

.. date: 2024-10-05-23-53-06 .. gh-issue: 125008 .. nonce: ETANpd .. section: Library

Fix :func:tokenize.untokenize producing invalid syntax for double braces preceded by certain escape characters.

.. date: 2024-10-03-22-26-39 .. gh-issue: 124871 .. nonce: tAMF47 .. section: Core and Builtins

Fix compiler bug (in some versions of 3.13) where an assertion fails during reachability analysis.

.. date: 2024-10-03-14-39-41 .. gh-issue: 123378 .. nonce: dCxANf .. section: Core and Builtins

Fix a crash in the :meth:~object.__str__ method of :exc:UnicodeError objects when the :attr:UnicodeError.start and :attr:UnicodeError.end values are invalid or out-of-range. Patch by Bénédikt Tran.

.. date: 2024-09-30-16-39-37 .. gh-issue: 118093 .. nonce: J2A3gz .. section: Core and Builtins

Improve the experimental JIT compiler's ability to stay "on trace" when encountering highly-biased branches.

.. date: 2024-09-27-17-18-53 .. gh-issue: 124642 .. nonce: OCjhBJ .. section: Core and Builtins

Fixed scalability issue in free-threaded builds for lock-free reads from dictionaries in multi-threaded scenarios

.. date: 2024-09-26-18-21-06 .. gh-issue: 116510 .. nonce: FacUWO .. section: Core and Builtins

Fix a crash caused by immortal interned strings being shared between sub-interpreters that use basic single-phase init. In that case, the string can be used by an interpreter that outlives the interpreter that created and interned it. For interpreters that share obmalloc state, also share the interned dict with the main interpreter.

.. date: 2024-09-26-17-55-34 .. gh-issue: 116510 .. nonce: dhn8w8 .. section: Core and Builtins

Fix a bug that can cause a crash when sub-interpreters use "basic" single-phase extension modules. Shared objects could refer to PyGC_Head nodes that had been freed as part of interpreter cleanup.

.. date: 2024-09-26-13-25-01 .. gh-issue: 119180 .. nonce: k_JCX0 .. section: Core and Builtins

The __main__ module no longer always contains an __annotations__ dictionary in its global namespace.

.. date: 2024-09-26-12-19-13 .. gh-issue: 124547 .. nonce: P_SHfU .. section: Core and Builtins

When deallocating an object with inline values whose __dict__ is still live: if memory allocation for the inline values fails, clear the dictionary. Prevents an interpreter crash.

.. date: 2024-09-25-14-45-56 .. gh-issue: 124513 .. nonce: ywiXtr .. section: Core and Builtins

Fix a crash in FrameLocalsProxy constructor: check the number of arguments. Patch by Victor Stinner.

.. date: 2024-09-25-11-53-22 .. gh-issue: 124442 .. nonce: EXC1Ve .. section: Core and Builtins

Fix nondeterminism in compilation by sorting the value of :attr:~type.__static_attributes__. Patch by kp2pml30.

.. date: 2024-09-23-23-06-19 .. gh-issue: 124285 .. nonce: mahGTg .. section: Core and Builtins

Fix bug where bool(a) can be invoked more than once during the evaluation of a compound boolean expression.

.. date: 2024-09-23-15-23-14 .. gh-issue: 123856 .. nonce: yrgJ9m .. section: Core and Builtins

Fix PyREPL failure when a keyboard interrupt is triggered after using a history search

.. date: 2024-09-23-13-25-27 .. gh-issue: 65961 .. nonce: LDqXV2 .. section: Core and Builtins

Deprecate the setting and using __package__ and __cached__.

.. date: 2024-09-19-16-57-34 .. gh-issue: 119726 .. nonce: DseseK .. section: Core and Builtins

The JIT now generates more efficient code for calls to C functions resulting in up to 0.8% memory savings and 1.5% speed improvement on AArch64. Patch by Diego Russo.

.. date: 2024-09-19-13-17-31 .. gh-issue: 122878 .. nonce: 4iFpsB .. section: Core and Builtins

Use the pager binary, if available (e.g. on Debian and derivatives), to display REPL help().

.. date: 2024-09-17-22-06-01 .. gh-issue: 124188 .. nonce: aFqNAB .. section: Core and Builtins

Fix reading and decoding a line from the source file with non-UTF-8 encoding for syntax errors raised in the compiler.

.. date: 2024-09-13-02-25-06 .. gh-issue: 124027 .. nonce: to_9DY .. section: Core and Builtins

Support <page up>, <page down>, and <delete> keys in the Python REPL when $TERM is set to vt100.

.. date: 2024-09-12-21-53-26 .. gh-issue: 124022 .. nonce: fQzUiW .. section: Core and Builtins

Fix bug where docstring is removed from classes in interactive mode.

.. date: 2024-09-11-15-48-36 .. gh-issue: 123958 .. nonce: 5VW2r0 .. section: Core and Builtins

docstrings are now removed from the optimized AST in optimization level 2.

.. date: 2024-09-10-20-25-00 .. gh-issue: 123923 .. nonce: A7uxqa .. section: Core and Builtins

The f_executable field in the internal :c:struct:_PyInterpreterFrame struct now uses a tagged pointer. Profilers and debuggers that uses this field should clear the least significant bit to recover the :c:expr:PyObject* pointer.

.. date: 2024-09-10-13-27-16 .. gh-issue: 77894 .. nonce: ZC-Olu .. section: Core and Builtins

Fix possible crash in the garbage collector when it tries to break a reference loop containing a :class:memoryview object. Now a :class:!memoryview object can only be cleared if there are no buffers that refer it.

.. date: 2024-09-06-19-23-44 .. gh-issue: 120221 .. nonce: giJEDT .. section: Core and Builtins

asyncio REPL is now again properly recognizing KeyboardInterrupts. Display of exceptions raised in secondary threads is fixed.

.. date: 2024-09-06-14-13-01 .. gh-issue: 119310 .. nonce: WQxyDF .. section: Core and Builtins

Allow the new interactive shell to read history files written with the editline library that use unicode-escaped entries. Patch by aorcajo and Łukasz Langa.

.. date: 2024-09-03-13-34-35 .. gh-issue: 123572 .. nonce: uuqoYV .. section: Core and Builtins

Fix key mappings for various F-keys in Windows for the new REPL. Patch by devdanzin

.. date: 2024-09-02-20-39-10 .. gh-issue: 123614 .. nonce: 26TMHp .. section: Library

Add :func:turtle.save to easily save Turtle drawings as PostScript files. Patch by Marie Roald and Yngve Mardal Moe.

.. date: 2024-09-02-20-36-45 .. gh-issue: 123339 .. nonce: QcmpSs .. section: Core and Builtins

Setting the :attr:!__module__ attribute for a class now removes the __firstlineno__ item from the type's dict, so they will no longer be inconsistent.

.. date: 2024-09-02-17-32-15 .. gh-issue: 119034 .. nonce: HYh5Vj .. section: Core and Builtins

Change <page up> and <page down> keys of the Python REPL to history search forward/backward. Patch by Victor Stinner.

.. date: 2024-09-01-12-08-39 .. gh-issue: 123562 .. nonce: aJPKVu .. section: Core and Builtins

Improve :exc:SyntaxError message for using case ... as ... with not a name.

.. date: 2024-09-01-00-02-05 .. gh-issue: 123545 .. nonce: 8nQNbL .. section: Core and Builtins

Fix a double decref in rare cases on experimental JIT builds.

.. date: 2024-08-29-19-46-07 .. gh-issue: 123484 .. nonce: rjUn_F .. section: Core and Builtins

Fix _Py_DebugOffsets for long objects to be relative to the start of the object rather than the start of a subobject.

.. date: 2024-08-29-13-18-18 .. gh-issue: 123446 .. nonce: KWDrgq .. section: Core and Builtins

Fix empty function name in :exc:TypeError when builtin magic methods are used without the required args.

.. date: 2024-08-28-22-42-51 .. gh-issue: 123440 .. nonce: yOFB0N .. section: Core and Builtins

Improve :exc:SyntaxError message for using except as with not a name.

.. date: 2024-08-27-21-44-14 .. gh-issue: 116017 .. nonce: ZY3yBY .. section: Core and Builtins

Improved JIT memory consumption by periodically freeing memory used by infrequently-executed code. This change is especially likely to improve the memory footprint of long-running programs.

.. date: 2024-08-27-13-16-40 .. gh-issue: 123344 .. nonce: 56Or78 .. section: Core and Builtins

Add AST optimizations for type parameter defaults.

.. date: 2024-08-26-00-58-26 .. gh-issue: 123321 .. nonce: ApxcnE .. section: Core and Builtins

Prevent Parser/myreadline race condition from segfaulting on multi-threaded use. Patch by Bar Harel and Amit Wienner.

.. date: 2024-08-25-18-27-49 .. gh-issue: 123177 .. nonce: yLuyqE .. section: Core and Builtins

Fix a bug causing stray prompts to appear in the middle of wrapped lines in the new REPL.

.. date: 2024-08-25-10-54-22 .. gh-issue: 122982 .. nonce: KLD91q .. section: Core and Builtins

Extend the deprecation period for bool inversion (~) by two years.

.. date: 2024-08-23-21-20-34 .. gh-issue: 123271 .. nonce: xeVViR .. section: Core and Builtins

Make concurrent iterations over the same :func:zip iterator safe under free-threading.

.. date: 2024-08-23-18-31-10 .. gh-issue: 123275 .. nonce: DprIrj .. section: Core and Builtins

Support :option:-X gil=1 <-X> and :envvar:PYTHON_GIL=1 <PYTHON_GIL> on non-free-threaded builds.

.. date: 2024-08-23-15-59-54 .. gh-issue: 123177 .. nonce: OLcaC5 .. section: Core and Builtins

Deactivate line wrap in the Apple Terminal via a ANSI escape code. Patch by Pablo Galindo

.. date: 2024-08-23-13-08-27 .. gh-issue: 123229 .. nonce: aHm-dw .. section: Core and Builtins

Fix valgrind warning by initializing the f-string buffers to 0 in the tokenizer. Patch by Pablo Galindo

.. date: 2024-08-23-11-26-54 .. gh-issue: 122298 .. nonce: ZMyln4 .. section: Core and Builtins

Restore printout of GC stats when gc.set_debug(gc.DEBUG_STATS) is called. This feature was accidentally removed when implementing incremental GC.

.. date: 2024-08-21-15-22-53 .. gh-issue: 121804 .. nonce: r5K3PS .. section: Core and Builtins

Correctly show error locations when a :exc:SyntaxError is raised in the basic REPL. Patch by Sergey B Kirpichev.

.. date: 2024-08-21-08-53-00 .. gh-issue: 115776 .. nonce: 9A7Dv_ .. section: Core and Builtins

Enables inline values (Python's equivalent of hidden classes) on any class who's instances are of a fixed size.

.. date: 2024-08-20-12-29-52 .. gh-issue: 123142 .. nonce: 3PXiNb .. section: Core and Builtins

Fix too-wide source location in exception tracebacks coming from broken iterables in comprehensions.

.. date: 2024-08-20-11-09-16 .. gh-issue: 123048 .. nonce: 2TISpv .. section: Core and Builtins

Fix a bug where pattern matching code could emit a :opcode:JUMP_FORWARD with no source location.

.. date: 2024-08-19-15-13-13 .. gh-issue: 118093 .. nonce: dLZ8qS .. section: Core and Builtins

Break up CALL_ALLOC_AND_ENTER_INIT into micro-ops and relax requirement for exact args, in order to increase the amount of code supported by tier 2.

.. date: 2024-08-18-18-25-54 .. gh-issue: 123123 .. nonce: 0ZcaEB .. section: Core and Builtins

Fix displaying :exc:SyntaxError exceptions covering multiple lines. Patch by Pablo Galindo

.. date: 2024-08-17-17-26-25 .. gh-issue: 123083 .. nonce: 9xWLJ- .. section: Core and Builtins

Fix a potential use-after-free in STORE_ATTR_WITH_HINT.

.. date: 2024-08-15-19-28-43 .. gh-issue: 123022 .. nonce: m3EF9E .. section: Core and Builtins

Fix crash in free-threaded build when calling :c:func:Py_Initialize from a non-main thread.

.. date: 2024-08-14-11-38-56 .. gh-issue: 118093 .. nonce: 3BywDP .. section: Core and Builtins

Add three specializations for :opcode:CALL_KW:

:opcode:!CALL_KW_PY for calls to Python functions
:opcode:!CALL_KW_BOUND_METHOD for calls to bound methods
:opcode:!CALL_KW_NON_PY for all other calls

.. date: 2024-08-12-11-45-47 .. gh-issue: 122821 .. nonce: WnAzTK .. section: Core and Builtins

Make sure that branches in :keyword:while statements have consistent offsets for :mod:sys.monitoring. :keyword:!while statements are now compiled with a simple jump at the end of the body, instead of duplicating the test.

.. date: 2024-08-12-11-19-37 .. gh-issue: 122907 .. nonce: q68096 .. section: Core and Builtins

Building with HAVE_DYNAMIC_LOADING now works as well as it did in 3.12. Existing deficiences will be addressed separately. (See https://github.com/python/cpython/issues/122950.)

.. date: 2024-08-10-12-44-03 .. gh-issue: 122888 .. nonce: TUyu9r .. section: Core and Builtins

Fix crash on certain calls to str() with positional arguments of the wrong type. Patch by Jelle Zijlstra.

.. date: 2024-08-08-16-02-28 .. gh-issue: 118093 .. nonce: m6Mrvy .. section: Core and Builtins

Improve the experimental JIT's handling of polymorphic code.

.. date: 2024-08-05-19-28-12 .. gh-issue: 122697 .. nonce: 17MvYl .. section: Core and Builtins

Fixed memory leaks at interpreter shutdown in the free-threaded build, and also reporting of leaked memory blocks via :option:-X showrefcount <-X>.

.. date: 2024-08-05-19-04-06 .. gh-issue: 116622 .. nonce: 3LWUzE .. section: Core and Builtins

Fix Android stdout and stderr messages being truncated or lost.

.. date: 2024-08-01-19-13-58 .. gh-issue: 122527 .. nonce: eztso6 .. section: Core and Builtins

Fix a crash that occurred when a PyStructSequence was deallocated after its type's dictionary was cleared by the GC. The type's :c:member:~PyTypeObject.tp_basicsize now accounts for non-sequence fields that aren't included in the :c:macro:Py_SIZE of the sequence.

.. date: 2024-07-30-11-41-35 .. gh-issue: 122445 .. nonce: Rq0bjS .. section: Core and Builtins

Add only fields which are modified via self.* to :attr:~type.__static_attributes__.

.. date: 2024-07-29-19-20-25 .. gh-issue: 122417 .. nonce: NVgs0a .. section: Core and Builtins

In the free-threaded build, the reference counts for heap type objects are now partially stored in a distributed manner in per-thread arrays. This reduces contention on the heap type's reference count fields when creating or destroying instances of the same type from multiple threads concurrently.

.. date: 2024-07-29-10-55-46 .. gh-issue: 116090 .. nonce: p1MhU0 .. section: Core and Builtins

Fix an issue in JIT builds that prevented some :keyword:for loops from correctly firing :monitoring-event:RAISE monitoring events.

.. date: 2024-07-26-14-05-51 .. gh-issue: 122300 .. nonce: SVIF-l .. section: Core and Builtins

Preserve AST nodes for f-string with single-element format specifiers. Patch by Pablo Galindo

.. date: 2024-07-26-13-56-32 .. gh-issue: 120906 .. nonce: qBh2I9 .. section: Core and Builtins

:attr:frame.f_locals now supports arbitrary hashable objects as keys.

.. date: 2024-07-25-01-45-21 .. gh-issue: 122239 .. nonce: 7zh-sW .. section: Core and Builtins

When a :class:list, :class:tuple or :class:dict with too many elements is unpacked, show the actual length in the error message.

.. date: 2024-07-24-22-39-07 .. gh-issue: 122245 .. nonce: LVa9v8 .. section: Core and Builtins

Detection of writes to __debug__ is moved from the compiler's codegen stage to the symtable. This means that these errors are now detected even in code that is optimized away before codegen (such as assertions with the :option:-O command line option).

.. date: 2024-07-24-17-11-51 .. gh-issue: 122234 .. nonce: VxsP_F .. section: Core and Builtins

Specializations for sums with float and complex inputs in :func:sum now always use compensated summation. Also, for integer items in above specializations: :c:func:PyLong_AsDouble is used, instead of :c:func:PyLong_AsLongAndOverflow. Patch by Sergey B Kirpichev.

.. date: 2024-07-23-23-59-04 .. gh-issue: 122208 .. nonce: z8KHsY .. section: Core and Builtins

Dictionary watchers now only deliver the PyDict_EVENT_ADDED event when the insertion is in a known good state to succeed.

.. date: 2024-07-23-11-57-36 .. gh-issue: 122160 .. nonce: HSnrAP .. section: Core and Builtins

Remove the BUILD_CONST_KEY_MAP opcode. Use :opcode:BUILD_MAP instead.

.. date: 2024-07-21-01-23-54 .. gh-issue: 122029 .. nonce: gKv-e2 .. section: Core and Builtins

Emit c_call events in :func:sys.setprofile when a PyMethodObject pointing to a PyCFunction is called.

.. date: 2024-07-19-15-28-05 .. gh-issue: 122026 .. nonce: sta2Ca .. section: Core and Builtins

Fix a bug that caused the tokenizer to not correctly identify mismatched parentheses inside f-strings in some situations. Patch by Pablo Galindo

.. date: 2024-07-19-09-38-01 .. gh-issue: 99108 .. nonce: qzM6gl .. section: Core and Builtins

Python's hashlib now unconditionally uses the vendored HACL* library for Blake2. Python no longer accepts libb2 as an optional dependency for Blake2.

We refreshed HACL* to the latest version, and now vendor HACL*'s 128-bit and 256-bit wide vector implementations for Blake2, which are used on x86/x64 toolchains when the required CPU features are available at runtime.

HACL*'s 128-bit wide vector implementation of Blake2 can also run on ARM NEON and Power8, but lacking evidence of a performance gain, these are not enabled (yet).

.. date: 2024-07-18-21-19-04 .. gh-issue: 121999 .. nonce: 8IBbTK .. section: Library

The default extraction filter for the :mod:tarfile module is now set to :func:'data' <tarfile.data_filter>.

.. date: 2024-07-16-18-23-22 .. gh-issue: 121860 .. nonce: -FTauD .. section: Core and Builtins

Fix crash when rematerializing a managed dictionary after it was deleted.

.. date: 2024-07-16-15-11-51 .. gh-issue: 121795 .. nonce: xkIHrI .. section: Core and Builtins

Improve performance of set membership testing, set.remove() and set.discard() when the argument is a set.

.. date: 2024-07-15-20-41-06 .. gh-issue: 121814 .. nonce: oR2ixR .. section: Core and Builtins

Fixed the SegFault when :c:func:PyEval_SetTrace is used with no Python frame on stack.

.. date: 2024-07-15-20-03-29 .. gh-issue: 121295 .. nonce: w53ucI .. section: Core and Builtins

Fix PyREPL console getting into a blocked state after interrupting a long paste

.. date: 2024-07-15-16-26-32 .. gh-issue: 121794 .. nonce: fhBtiQ .. section: Core and Builtins

Fix bug in free-threaded Python where a resurrected object could lead to a negative ref count assertion failure.

.. date: 2024-07-13-12-27-31 .. gh-issue: 121657 .. nonce: wgOYLw .. section: Core and Builtins

Improve the :exc:SyntaxError message if the user tries to use :keyword:yield from <yield> outside a function.

.. date: 2024-07-13-09-51-44 .. gh-issue: 121609 .. nonce: jWsE5t .. section: Core and Builtins

Fix pasting of characters containing unicode character joiners in the new REPL. Patch by Marta Gomez Macias

.. date: 2024-07-12-18-18-44 .. gh-issue: 121297 .. nonce: 67VE7b .. section: Core and Builtins

Previously, incorrect usage of :keyword:await or asynchronous comprehensions in code removed by the :option:-O option was not flagged by the Python compiler. Now, such code raises :exc:SyntaxError. Patch by Jelle Zijlstra.

.. date: 2024-07-10-15-43-54 .. gh-issue: 117482 .. nonce: 5WYaXR .. section: Core and Builtins

Unexpected slot wrappers are no longer created for builtin static types in subinterpreters.

.. date: 2024-07-10-02-02-32 .. gh-issue: 121562 .. nonce: 8beIMi .. section: Core and Builtins

Optimized performance of hex_from_char by replacing switch-case with a lookup table

.. date: 2024-07-09-13-53-18 .. gh-issue: 121499 .. nonce: rpp7il .. section: Core and Builtins

Fix a bug affecting how multi-line history was being rendered in the new REPL after interacting with the new screen cache. Patch by Pablo Galindo

.. date: 2024-07-08-17-15-14 .. gh-issue: 121497 .. nonce: I8hMDC .. section: Core and Builtins

Fix a bug that was preventing the REPL to correctly respect the history when an input hook was set. Patch by Pablo Galindo

.. date: 2024-07-08-10-31-08 .. gh-issue: 121012 .. nonce: M5hHk- .. section: Core and Builtins

Tier 2 execution now ensures that list iterators remain exhausted, once they become exhausted.

.. date: 2024-07-08-02-24-55 .. gh-issue: 121439 .. nonce: jDHod3 .. section: Core and Builtins

Allow tuples of length 20 in the freelist to be reused.

.. date: 2024-07-05-11-29-27 .. gh-issue: 121288 .. nonce: lYKYYP .. section: Core and Builtins

:exc:ValueError messages for :meth:list.index, :meth:range.index, :meth:!deque.index, :meth:!deque.remove and :meth:!ShareableList.index no longer contain the repr of the searched value (which can be arbitrary large) and are consistent with error messages for other :meth:~sequence.index and :meth:~sequence.remove methods.

.. date: 2024-07-04-23-38-30 .. gh-issue: 121368 .. nonce: m3EF9E .. section: Core and Builtins

Fix race condition in _PyType_Lookup in the free-threaded build due to a missing memory fence. This could lead to _PyType_Lookup returning incorrect results on arm64.

.. date: 2024-06-30-03-48-10 .. gh-issue: 121149 .. nonce: lLBMKe .. section: Core and Builtins

Added specialization for summation of complexes, this also improves accuracy of builtin :func:sum for such inputs. Patch by Sergey B Kirpichev.

.. date: 2024-06-29-10-46-14 .. gh-issue: 121130 .. nonce: Rj66Xs .. section: Core and Builtins

Fix f-strings with debug expressions in format specifiers. Patch by Pablo Galindo

.. date: 2024-06-28-23-17-22 .. gh-issue: 121381 .. nonce: i2xL7P .. section: Library

Remove subprocess._USE_VFORK escape hatch code and documentation. It was added just in case, and doesn't have any known cases that require it.

.. date: 2024-06-28-18-34-49 .. gh-issue: 119726 .. nonce: Fjv_Ab .. section: Core and Builtins

Optimize code layout for calls to C functions from the JIT on AArch64. Patch by Diego Russo.

.. date: 2024-06-28-10-02-58 .. gh-issue: 121115 .. nonce: EeSLfc .. section: Core and Builtins

:c:func:PyLong_AsNativeBytes no longer uses :meth:~object.__index__ methods by default. The Py_ASNATIVEBYTES_ALLOW_INDEX flag has been added to allow it.

.. date: 2024-06-26-14-09-31 .. gh-issue: 120838 .. nonce: nFeTL9 .. section: Core and Builtins

:c:func:Py_Finalize() and :c:func:Py_FinalizeEx() now always run with the main interpreter active.

.. date: 2024-06-26-13-42-36 .. gh-issue: 113433 .. nonce: xKAtLB .. section: Core and Builtins

Subinterpreters now get cleaned up automatically during runtime finalization.

.. date: 2024-06-25-16-26-44 .. gh-issue: 119726 .. nonce: WqvHxB .. section: Core and Builtins

Improve the speed and memory use of C function calls from JIT code on AArch64. Patch by Diego Russo

.. date: 2024-06-24-08-39-23 .. gh-issue: 116017 .. nonce: -Bw2UY .. section: Core and Builtins

Simplify the warmup mechanism used for "side exits" in JIT code, resulting in slightly better performance and slightly lower memory usage for most platforms.

.. date: 2024-06-19-21-34-21 .. gh-issue: 98442 .. nonce: cqhjkN .. section: Core and Builtins

Fix too wide source locations of the cleanup instructions of a with statement.

.. date: 2024-06-19-19-54-35 .. gh-issue: 120754 .. nonce: uF29sj .. section: Core and Builtins

Reduce the number of system calls invoked when reading a whole file (ex. open('a.txt').read()). For a sample program that reads the contents of the 400+ .rst files in the cpython repository Doc folder, there is an over 10% reduction in system call count.

.. date: 2024-06-19-11-10-50 .. gh-issue: 119462 .. nonce: DpcqSe .. section: Core and Builtins

Make sure that invariants of type versioning are maintained: * Superclasses always have their version number assigned before subclasses * The version tag is always zero if the tag is not valid. * The version tag is always non-if the tag is valid.

.. date: 2024-06-19-01-58-54 .. gh-issue: 120437 .. nonce: nCkIoI .. section: Core and Builtins

Fix _CHECK_STACK_SPACE optimization problems introduced in :gh:118322.

.. date: 2024-06-18-22-41-05 .. gh-issue: 120722 .. nonce: rS7tkE .. section: Core and Builtins

Correctly set the bytecode position on return instructions within lambdas. Patch by Jelle Zijlstra.

.. date: 2024-06-18-21-34-30 .. gh-issue: 120367 .. nonce: zDwffP .. section: Core and Builtins

Fix bug where compiler creates a redundant jump during pseudo-op replacement. Can only happen with a synthetic AST that has a try on the same line as the instruction following the exception handler.

.. date: 2024-06-17-12-20-20 .. gh-issue: 120507 .. nonce: 94lz2J .. section: Core and Builtins

Remove the BEFORE_WITH and BEFORE_ASYNC_WITH instructions. Add the new :opcode:LOAD_SPECIAL instruction. Generate code for with and async with statements using the new instruction.

.. date: 2024-06-14-22-02-25 .. gh-issue: 113993 .. nonce: MiA0vX .. section: Core and Builtins

Strings interned with :func:sys.intern are again garbage-collected when no longer used, as per the documentation. Strings interned with the C function :c:func:PyUnicode_InternInPlace are still immortal. Internals of the string interning mechanism have been changed. This may affect performance and identities of :class:str objects.

.. date: 2024-06-14-07-52-00 .. gh-issue: 120485 .. nonce: yy4K4b .. section: Library

Add an override of allow_reuse_port on classes subclassing socketserver.TCPServer where allow_reuse_address is also overridden.

.. date: 2024-06-13-12-17-52 .. gh-issue: 120384 .. nonce: w1UBGl .. section: Core and Builtins

Fix an array out of bounds crash in list_ass_subscript, which could be invoked via some specifically tailored input: including concurrent modification of a list object, where one thread assigns a slice and another clears it.

.. date: 2024-06-12-18-50-29 .. gh-issue: 120367 .. nonce: LmXx2y .. section: Core and Builtins

Fix crash in compiler on code with redundant NOPs and JUMPs which show up after exception handlers are moved to the end of the code.

.. date: 2024-06-12-18-23-15 .. gh-issue: 120380 .. nonce: edtqjq .. section: Library

Fix Python implementation of :class:pickle.Pickler for :class:bytes and :class:bytearray objects when using protocol version 5. Patch by Bénédikt Tran.

.. date: 2024-06-12-13-47-25 .. gh-issue: 120397 .. nonce: n-I_cc .. section: Core and Builtins

Improve the throughput by up to two times for the :meth:str.count, :meth:bytes.count and :meth:bytearray.count methods for counting single characters.

.. date: 2024-06-11-17-56-12 .. gh-issue: 120221 .. nonce: si9hM9 .. section: Core and Builtins

Deliver real signals on Ctrl-C and Ctrl-Z in the new REPL. Patch by Pablo Galindo

.. date: 2024-06-11-12-47-54 .. gh-issue: 120346 .. nonce: hhn_6X .. section: Core and Builtins

Respect :envvar:PYTHON_BASIC_REPL when running in interactive inspect mode (python -i). Patch by Pablo Galindo

.. date: 2024-06-10-22-30-26 .. gh-issue: 93691 .. nonce: 68WOTS .. section: Core and Builtins

Fix source locations of instructions generated for the iterator of a for statement.

.. date: 2024-06-10-15-07-16 .. gh-issue: 120198 .. nonce: WW_pjO .. section: Core and Builtins

Fix a crash when multiple threads read and write to the same __class__ of an object concurrently.

.. date: 2024-06-10-10-42-48 .. gh-issue: 120298 .. nonce: napREA .. section: Core and Builtins

Fix use-after free in list_richcompare_impl which can be invoked via some specifically tailored evil input.

.. date: 2024-06-09-19-13-38 .. gh-issue: 119666 .. nonce: S0G4rZ .. section: Core and Builtins

Fix a compiler crash in the case where two comprehensions in class scope both reference __class__.

.. date: 2024-06-07-22-54-15 .. gh-issue: 119726 .. nonce: D9EE-o .. section: Core and Builtins

JIT: Re-use trampolines on AArch64 when creating stencils. Patch by Diego Russo

.. date: 2024-06-07-16-09-04 .. gh-issue: 120225 .. nonce: kuYf9t .. section: Core and Builtins

Fix crash in compiler on empty block at end of exception handler.

.. date: 2024-06-05-18-29-18 .. gh-issue: 93691 .. nonce: 6OautB .. section: Core and Builtins

Fix source locations of instructions generated for with statements.

.. date: 2024-06-05-10-32-44 .. gh-issue: 120097 .. nonce: 9S2klk .. section: Core and Builtins

FrameLocalsProxy now subclasses collections.abc.Mapping and can be matched as a mapping in match statements

.. date: 2024-06-05-08-39-40 .. gh-issue: 120080 .. nonce: DJFK11 .. section: Core and Builtins

Direct call to the :meth:!int.__round__ now accepts None as a valid argument.

.. date: 2024-06-03-13-48-44 .. gh-issue: 119933 .. nonce: Kc0HG5 .. section: Core and Builtins

Improve :exc:SyntaxError messages for invalid expressions in a type parameters bound, a type parameter constraint tuple or a default type parameter. Patch by Bénédikt Tran.

.. date: 2024-06-03-13-25-04 .. gh-issue: 119724 .. nonce: EH1dkA .. section: Core and Builtins

Reverted improvements to error messages for elif/else statements not matching any valid statements, which made in hard to locate the syntax errors inside those elif/else blocks.

.. date: 2024-06-02-06-12-35 .. gh-issue: 119879 .. nonce: Jit951 .. section: Core and Builtins

String search is now slightly faster for certain cases. It now utilizes last character gap (good suffix rule) for two-way periodic needles.

.. date: 2024-05-31-12-06-11 .. gh-issue: 119842 .. nonce: tCGVsv .. section: Core and Builtins

Honor :c:func:PyOS_InputHook in the new REPL. Patch by Pablo Galindo

.. date: 2024-05-31-08-23-41 .. gh-issue: 119180 .. nonce: KL4VxZ .. section: Core and Builtins

:func:classmethod and :func:staticmethod now wrap the :attr:~object.__annotations__ and :attr:~object.__annotate__ attributes of their underlying callable lazily. See :pep:649. Patch by Jelle Zijlstra.

.. date: 2024-05-30-23-01-00 .. gh-issue: 119821 .. nonce: jPGfvt .. section: Core and Builtins

Fix execution of :ref:annotation scopes <annotation-scopes> within classes when globals is set to a non-dict. Patch by Jelle Zijlstra.

.. date: 2024-05-30-04-11-36 .. gh-issue: 118934 .. nonce: fbDqve .. section: Core and Builtins

Make PyEval_GetLocals return borrowed reference

.. date: 2024-05-29-18-53-43 .. gh-issue: 119740 .. nonce: zP2JNM .. section: Core and Builtins

Remove the previously-deprecated delegation of :func:int to :meth:~object.__trunc__.

.. date: 2024-05-28-22-49-56 .. gh-issue: 119689 .. nonce: VwLFD5 .. section: Core and Builtins

Generate stack effect metadata for pseudo instructions from bytecodes.c.

.. date: 2024-05-27-19-13-49 .. gh-issue: 109218 .. nonce: -sdDg0 .. section: Core and Builtins

:func:complex accepts now a string only as a positional argument. Passing a complex number as the "real" or "imag" argument is deprecated; it should only be passed as a single positional argument.

.. date: 2024-05-25-16-45-27 .. gh-issue: 119548 .. nonce: pqF9Y6 .. section: Core and Builtins

Add a clear command to the REPL. Patch by Pablo Galindo

.. date: 2024-05-25-13-51-48 .. gh-issue: 111999 .. nonce: L0q1gh .. section: Core and Builtins

Fix the signature of :meth:str.format_map.

.. date: 2024-05-25-12-52-25 .. gh-issue: 119560 .. nonce: wSlm8q .. section: Core and Builtins

An invalid assert in beta 1 has been removed. The assert would fail if PyState_FindModule() was used in an extension module's init function before the module def had been initialized.

.. date: 2024-05-24-21-16-52 .. gh-issue: 119369 .. nonce: qBThho .. section: Core and Builtins

Fix deadlock during thread deletion in free-threaded build, which could occur when the GIL was enabled at runtime.

.. date: 2024-05-24-21-04-00 .. gh-issue: 119525 .. nonce: zLFLf1 .. section: Core and Builtins

Fix deadlock involving _PyType_Lookup() cache in the free-threaded build when the GIL is dynamically enabled at runtime.

.. date: 2024-05-23-20-17-37 .. gh-issue: 119258 .. nonce: wZFIpt .. section: Core and Builtins

Eliminate type version guards in the tier two interpreter.

Note that setting the tp_version_tag manually (which has never been supported) may result in crashes.

.. date: 2024-05-23-06-34-45 .. gh-issue: 119311 .. nonce: 2DBwKR .. section: Core and Builtins

Fix bug where names are unexpectedly mangled in the bases of generic classes.

.. date: 2024-05-23-06-34-14 .. gh-issue: 119395 .. nonce: z-Hsqb .. section: Core and Builtins

Fix bug where names appearing after a generic class are mangled as if they are in the generic class.

.. date: 2024-05-22-12-49-03 .. gh-issue: 119372 .. nonce: PXig1R .. section: Core and Builtins

Correct invalid corner cases in complex division (resulted in (nan+nanj) output), e.g. 1/complex('(inf+infj)'). Patch by Sergey B Kirpichev.

.. date: 2024-05-22-06-22-47 .. gh-issue: 119180 .. nonce: vZMiXm .. section: Core and Builtins

Evaluation of annotations is now deferred. See :pep:649 for details.

.. date: 2024-05-21-12-17-02 .. gh-issue: 119180 .. nonce: UNDUb9 .. section: Core and Builtins

Replace :opcode:!LOAD_ASSERTION_ERROR opcode with :opcode:LOAD_COMMON_CONSTANT and add support for :exc:NotImplementedError.

.. date: 2024-05-21-11-27-14 .. gh-issue: 119213 .. nonce: nxjxrt .. section: Core and Builtins

Non-builtin modules built with argument clinic were crashing if used in a subinterpreter before the main interpreter. The objects that were causing the problem by leaking between interpreters carelessly have been fixed.

.. date: 2024-05-21-09-46-51 .. gh-issue: 119011 .. nonce: WOe3bu .. section: Core and Builtins

Fixes type.__type_params__ to return an empty tuple instead of a descriptor.

.. date: 2024-05-20-14-57-39 .. gh-issue: 118692 .. nonce: Qadm7F .. section: Core and Builtins

Avoid creating unnecessary :exc:StopIteration instances for monitoring.

.. date: 2024-05-20-10-10-51 .. gh-issue: 119180 .. nonce: 35xqpu .. section: Core and Builtins

Add an __annotate__ attribute to functions, classes, and modules as part of :pep:649. Patch by Jelle Zijlstra.

.. date: 2024-05-16-23-02-03 .. gh-issue: 119049 .. nonce: qpd_S- .. section: Core and Builtins

Fix displaying the source line for warnings created by the C API if the :mod:warnings module had not yet been imported.

.. date: 2024-05-15-12-15-58 .. gh-issue: 119057 .. nonce: P3G9G2 .. section: Core and Builtins

Improve :exc:ZeroDivisionError error message. Now, all error messages are harmonized: all /, //, and % operations just use "division by zero" message. And 0 ** -1 operation uses "zero to a negative power".

.. date: 2024-05-11-21-44-17 .. gh-issue: 118844 .. nonce: q2H_km .. section: Core and Builtins

Fix build failures when configuring with both --disable-gil and --enable-experimental-jit.

.. date: 2024-05-10-19-54-18 .. gh-issue: 118921 .. nonce: O4ztZG .. section: Core and Builtins

Add copy() method for FrameLocalsProxy which returns a snapshot dict for local variables.

.. date: 2024-05-09-19-47-12 .. gh-issue: 117657 .. nonce: Vn0Yey .. section: Core and Builtins

Fix data races on the field that stores a pointer to the interpreter's main thread that occur in free-threaded builds.

.. date: 2024-05-09-02-37-25 .. gh-issue: 118750 .. nonce: 7aLfT- .. section: Core and Builtins

If the C version of the decimal module is available, int(str) now uses it to supply an asymptotically much faster conversion. However, this only applies if the string contains over about 2 million digits.

.. date: 2024-05-08-09-44-15 .. gh-issue: 118767 .. nonce: iFF5F5 .. section: Core and Builtins

Using :data:NotImplemented in a boolean context now raises :exc:TypeError. Contributed by Jelle Zijlstra.

.. date: 2024-05-07-16-57-56 .. gh-issue: 118561 .. nonce: wNMKVd .. section: Core and Builtins

Fix race condition in free-threaded build where :meth:list.extend could expose uninitialised memory to concurrent readers.

.. date: 2024-05-01-05-09-16 .. gh-issue: 117139 .. nonce: t41w_D .. section: Core and Builtins

Convert the Python evaluation stack to use internal stack references. The purpose is to support tagged pointers. In :pep:703, this will allow for its form of deferred reference counting. For both the default and free-threaded builds, this sets up the infrastructure for unboxed integers in the future.

.. date: 2024-04-27-18-36-46 .. gh-issue: 115801 .. nonce: SVeHSy .. section: Library

Raise TypeError when passing a string to :func:difflib.unified_diff and :func:difflib.context_diff.

.. date: 2024-04-08-13-49-02 .. gh-issue: 117558 .. nonce: 9lSEpR .. section: Core and Builtins

Improve error messages when a string, bytes or bytearray object of length 1 is expected.

.. date: 2024-03-25-15-07-01 .. gh-issue: 117195 .. nonce: OWakgD .. section: Core and Builtins

Avoid assertion failure for debug builds when calling object.__sizeof__(1)

.. date: 2024-03-19-22-21-22 .. gh-issue: 116022 .. nonce: iyHENN .. section: Core and Builtins

Improve the :meth:~object.__repr__ output of :class:~ast.AST nodes.

.. date: 2024-01-15-21-51-26 .. gh-issue: 114091 .. nonce: VOtSJl .. section: Core and Builtins

Changed the error message for awaiting something that can't be awaited from "object <type> can't be used in an await expression" to "'<type>' object can't be awaited".

.. date: 2024-01-15-18-11-48 .. gh-issue: 113190 .. nonce: OwQX64 .. section: Core and Builtins

:c:func:Py_Finalize now deletes all interned strings.

.. date: 2023-10-14-23-05-40 .. gh-issue: 84978 .. nonce: Z0t6dg .. section: Core and Builtins

Add class methods :meth:float.from_number and :meth:complex.from_number.

.. date: 2022-07-22-15-56-35 .. gh-issue: 95144 .. nonce: FZYWX- .. section: Core and Builtins

Improve the error message from a in b when b is not a container to mention the term "container".

.. bpo: 24766 .. date: 2018-10-09-15-14-53 .. nonce: c_C1Wc .. section: Core and Builtins

Fix handling of doc argument to subclasses of property.

.. date: 2024-10-03-14-06-08 .. gh-issue: 123961 .. nonce: uwJQTY .. section: C API

Convert the :ref:curses.window <curses-window-objects> static type exposed by the :c:macro:!PyCursesWindow_Type macro in Include/py_curses.h to a :ref:heap type <heap-types>. Patch by Bénédikt Tran.

.. date: 2024-09-25-11-44-02 .. gh-issue: 124502 .. nonce: qWuDjT .. section: C API

Add :c:func:PyUnicode_Equal function to the limited C API: test if two strings are equal. Patch by Victor Stinner.

.. date: 2024-09-24-20-34-21 .. gh-issue: 124296 .. nonce: S4QoS1 .. section: C API

:c:type:PyDictObject no longer maintains a private version tag field ma_version_tag per :pep:699. This field was originally added in Python 3.6 (:pep:509) and deprecated in Python 3.12.

.. date: 2024-09-18-18-40-30 .. gh-issue: 124160 .. nonce: Zy-VKi .. section: C API

Fix crash when importing modules containing state and single-phase initialization in a subinterpreter.

.. date: 2024-09-17-05-23-35 .. gh-issue: 124153 .. nonce: L8TWmx .. section: C API

Add :c:func:PyType_GetBaseByToken and :c:data:Py_tp_token slot for easier type checking, related to :pep:489 and :pep:630.

.. date: 2024-09-16-16-21-39 .. gh-issue: 124127 .. nonce: LB8DBU .. section: C API

In the limited C API 3.14 and newer, :c:func:Py_REFCNT is now implemented as an opaque function call to hide implementation details. Patch by Victor Stinner.

.. date: 2024-09-12-16-16-24 .. gh-issue: 123880 .. nonce: 2-8vcj .. section: C API

Fixed a bug that prevented circular imports of extension modules that use single-phase initialization.

.. date: 2024-09-10-16-54-27 .. gh-issue: 123909 .. nonce: CTGxDR .. section: C API

:c:func:PyType_FromSpec, :c:func:PyType_FromSpecWithBases and :c:func:PyType_FromModuleAndSpec will now fail if the metaclass of the new type has custom :c:member:~PyTypeObject.tp_new.

.. date: 2024-08-30-14-02-17 .. gh-issue: 107954 .. nonce: TPvj4u .. section: C API

Add functions to configure the Python initialization (:pep:741):

:c:func:PyInitConfig_Create
:c:func:PyInitConfig_Free
:c:func:PyInitConfig_GetError
:c:func:PyInitConfig_GetExitCode
:c:func:PyInitConfig_HasOption
:c:func:PyInitConfig_GetInt
:c:func:PyInitConfig_GetStr
:c:func:PyInitConfig_GetStrList
:c:func:PyInitConfig_FreeStrList
:c:func:PyInitConfig_SetInt
:c:func:PyInitConfig_SetStr
:c:func:PyInitConfig_SetStrList
:c:func:PyInitConfig_AddModule
:c:func:Py_InitializeFromInitConfig

Patch by Victor Stinner.

.. date: 2024-08-29-15-55-55 .. gh-issue: 107954 .. nonce: pr2O50 .. section: C API

Add functions to get and set the current runtime Python configuration:

:c:func:PyConfig_Get
:c:func:PyConfig_GetInt
:c:func:PyConfig_Set
:c:func:PyConfig_Names

Patch by Victor Stinner.

.. date: 2024-08-29-15-05-19 .. gh-issue: 123465 .. nonce: eqwNWq .. section: C API

:c:macro:Py_RELATIVE_OFFSET is now allowed in :c:type:PyMemberDef for the special offset member "__vectorcalloffset__", as well as the discouraged special offset members "__dictoffset__" and "__weaklistoffset__"

.. date: 2024-08-26-13-01-20 .. gh-issue: 100554 .. nonce: 0ku85o .. section: C API

Added a slot Py_tp_vectorcall to set :c:member:~PyTypeObject.tp_vectorcall via the :c:func:PyType_FromSpec function family. Limited API extensions can use this feature to provide more efficient vector call-based implementation of __new__ and __init__.

.. date: 2024-08-09-13-12-20 .. gh-issue: 122854 .. nonce: -1OgvU .. section: C API

Add :c:func:Py_HashBuffer to compute and return the hash value of a buffer. Patch by Antoine Pitrou and Victor Stinner.

.. date: 2024-08-06-14-23-11 .. gh-issue: 122728 .. nonce: l-fQ-v .. section: C API

Fix :c:func:PyEval_GetLocals to avoid :exc:SystemError ("bad argument to internal function"). Patch by Victor Stinner.

.. date: 2024-07-30-23-48-26 .. gh-issue: 116622 .. nonce: yTTtil .. section: C API

Make :any:PyObject_Print work around a bug in Android and OpenBSD which prevented it from throwing an exception when trying to write to a read-only stream.

.. date: 2024-07-27-00-28-35 .. gh-issue: 105201 .. nonce: 0-xUWq .. section: C API

Add :c:func:PyIter_NextItem to replace :c:func:PyIter_Next, which has an ambiguous return value. Patch by Irit Katriel and Erlend Aasland.

.. date: 2024-07-21-17-40-07 .. gh-issue: 121489 .. nonce: SUMFCr .. section: C API

Export private :c:func:!_PyBytes_Join again.

.. date: 2024-07-12-13-40-59 .. gh-issue: 121645 .. nonce: 96QvD3 .. section: C API

Add :c:func:PyBytes_Join(sep, iterable) <PyBytes_Join> function, similar to sep.join(iterable) in Python. Patch by Victor Stinner.

.. date: 2024-07-09-15-55-20 .. gh-issue: 89364 .. nonce: yYYroI .. section: C API

Export the :c:func:PySignal_SetWakeupFd function. Previously, the function was documented but it couldn't be used in 3rd party code. Patch by Victor Stinner.

.. date: 2024-07-04-15-41-10 .. gh-issue: 113993 .. nonce: cLSiWV .. section: C API

:c:func:PyUnicode_InternInPlace no longer prevents its argument from being garbage collected.

Several functions that take char * are now documented as possibly preventing string objects from being garbage collected; refer to their documentation for details: :c:func:PyUnicode_InternFromString, :c:func:PyDict_SetItemString, :c:func:PyObject_SetAttrString, :c:func:PyObject_DelAttrString, :c:func:PyUnicode_InternFromString, and PyModule_Add* convenience functions.

.. date: 2024-07-04-13-23-27 .. gh-issue: 113601 .. nonce: K3RLqp .. section: C API

Removed debug build assertions related to interning strings, which were falsely triggered by stable ABI extensions.

.. date: 2024-07-02-11-03-40 .. gh-issue: 112136 .. nonce: f3fiY8 .. section: C API

Restore the private _PyArg_Parser structure and the private _PyArg_ParseTupleAndKeywordsFast() function, previously removed in Python 3.13 alpha 1. Patch by Victor Stinner.

.. date: 2024-06-26-11-29-01 .. gh-issue: 120642 .. nonce: H7P9qK .. section: C API

Remove the private _Py_CODEUNIT type from the public C API. The internal pycore_code.h header should now be used to get this internal type. Patch by Victor Stinner.

.. date: 2024-06-21-16-41-21 .. gh-issue: 120858 .. nonce: Z5_-Mn .. section: C API

:c:func:PyDict_Next no longer locks the dictionary in the free-threaded build. The locking needs to be done by the caller around the entire iteration loop.

.. date: 2024-06-19-21-27-42 .. gh-issue: 120642 .. nonce: UlKClN .. section: C API

Remove the following unstable functions:

PyUnstable_Replace_Executor()
PyUnstable_SetOptimizer()
PyUnstable_GetOptimizer()
PyUnstable_GetExecutor()
PyUnstable_Optimizer_NewCounter()
PyUnstable_Optimizer_NewUOpOptimizer()

Patch by Victor Stinner.

.. date: 2024-06-19-17-27-22 .. gh-issue: 120389 .. nonce: GSZeHF .. section: C API

Add new functions to convert C <stdint.h> numbers from/to Python :class:int:

:c:func:PyLong_FromInt32
:c:func:PyLong_FromUInt32
:c:func:PyLong_FromInt64
:c:func:PyLong_FromUInt64
:c:func:PyLong_AsInt32
:c:func:PyLong_AsUInt32
:c:func:PyLong_AsInt64
:c:func:PyLong_AsUInt64

Patch by Victor Stinner.

.. date: 2024-06-16-22-58-47 .. gh-issue: 120600 .. nonce: TJdf0w .. section: C API

In the limited C API 3.14 and newer, :c:func:Py_TYPE is now implemented as an opaque function call to hide implementation details. Patch by Victor Stinner.

.. date: 2024-06-11-21-38-32 .. gh-issue: 70278 .. nonce: WDE4zM .. section: C API

:c:func:PyUnicode_FromFormat no longer produces the ending \ufffd character for truncated C string when use precision with %s and %V. It now truncates the string before the start of truncated multibyte sequences.

.. date: 2024-06-08-08-33-40 .. gh-issue: 119771 .. nonce: Oip2dL .. section: C API

Set :data:errno in :c:func:_Py_c_pow on overflows. Patch by Sergey B Kirpichev.

.. date: 2024-06-07-22-12-30 .. gh-issue: 119182 .. nonce: yt8Ar7 .. section: C API

Add a new :c:type:PyUnicodeWriter API to create a Python :class:str object:

:c:func:PyUnicodeWriter_Create.
:c:func:PyUnicodeWriter_Discard.
:c:func:PyUnicodeWriter_Finish.
:c:func:PyUnicodeWriter_WriteChar.
:c:func:PyUnicodeWriter_WriteUTF8.
:c:func:PyUnicodeWriter_WriteUCS4.
:c:func:PyUnicodeWriter_WriteWideChar.
:c:func:PyUnicodeWriter_WriteStr.
:c:func:PyUnicodeWriter_WriteRepr.
:c:func:PyUnicodeWriter_WriteSubstring.
:c:func:PyUnicodeWriter_Format.
:c:func:PyUnicodeWriter_DecodeUTF8Stateful.

Patch by Victor Stinner.

.. date: 2024-06-04-10-58-20 .. gh-issue: 119613 .. nonce: qOr9GF .. section: C API

Soft deprecate the :c:macro:Py_MEMCPY macro: use directly memcpy() instead. Patch by Victor Stinner.

.. date: 2024-05-30-12-51-21 .. gh-issue: 119775 .. nonce: CBq9IG .. section: C API

Creating :c:data:immutable types <Py_TPFLAGS_IMMUTABLETYPE> with mutable bases was deprecated since 3.12 and now raises a :exc:TypeError.

.. date: 2024-05-29-21-05-59 .. gh-issue: 119585 .. nonce: Sn7JL3 .. section: C API

Fix crash when a thread state that was created by :c:func:PyGILState_Ensure calls a destructor that during :c:func:PyThreadState_Clear that calls back into :c:func:PyGILState_Ensure and :c:func:PyGILState_Release. This might occur when in the free-threaded build or when using thread-local variables whose destructors call :c:func:PyGILState_Ensure.

.. date: 2024-05-29-09-21-37 .. gh-issue: 119613 .. nonce: J2xfrC .. section: C API

Macros Py_IS_NAN, Py_IS_INFINITY and Py_IS_FINITE are :term:soft deprecated.

.. date: 2024-05-22-17-50-48 .. gh-issue: 119336 .. nonce: ff3qnS .. section: C API

Restore the removed _PyLong_NumBits() function. It is used by the pywin32 project. Patch by Ethan Smith

.. date: 2024-05-21-19-41-41 .. gh-issue: 119344 .. nonce: QKvzQb .. section: C API

The critical section API is now public as part of the non-limited C API.

.. date: 2024-05-21-18-28-44 .. gh-issue: 119333 .. nonce: OTsYVX .. section: C API

Add :c:func:PyContext_AddWatcher and :c:func:PyContext_ClearWatcher APIs to register callbacks to receive notification on enter and exit of context objects.

.. date: 2024-05-21-11-35-11 .. gh-issue: 119247 .. nonce: U6n6mh .. section: C API

Added Py_BEGIN_CRITICAL_SECTION_SEQUENCE_FAST and Py_END_CRITICAL_SECTION_SEQUENCE_FAST macros to make it possible to use PySequence_Fast APIs safely when free-threaded, and update str.join to work without the GIL using them.

.. date: 2024-05-20-10-35-22 .. gh-issue: 111389 .. nonce: a6axBk .. section: C API

Add :c:macro:PyHASH_MULTIPLIER constant: prime multiplier used in string and various other hashes. Patch by Victor Stinner.

.. date: 2024-05-10-15-43-14 .. gh-issue: 118771 .. nonce: 5KVglT .. section: C API

Several C declarations with names that didn't start with the Py or _Py prefixes, which were added by mistake in 3.13 alpha and beta releases, were moved to internal headers.

.. date: 2024-05-08-23-14-06 .. gh-issue: 116984 .. nonce: 5sgcDo .. section: C API

Make mimalloc includes relative to the current file to avoid embedders or extensions needing to include Internal/mimalloc if they are already including internal CPython headers.

.. date: 2024-05-08-21-57-50 .. gh-issue: 118789 .. nonce: Ni4UQx .. section: C API

Add :c:func:PyUnstable_Object_ClearWeakRefsNoCallbacks, which clears weakrefs without calling their callbacks.

.. date: 2024-05-08-20-13-00 .. gh-issue: 118789 .. nonce: m88uUa .. section: C API

Restore _PyWeakref_ClearRef that was previously removed in Python 3.13 alpha 1.

.. date: 2024-04-10-16-48-04 .. gh-issue: 117511 .. nonce: RZtBRK .. section: C API

Make the :c:type:PyMutex public in the non-limited C API.

.. date: 2024-03-10-14-55-51 .. gh-issue: 116560 .. nonce: x2mZaO .. section: C API

Add :c:func:PyLong_GetSign function. Patch by Sergey B Kirpichev.

.. date: 2022-10-01-09-56-27 .. gh-issue: 97588 .. nonce: Gvg54o .. section: C API

Fix creating bitfields in :mod:ctypes structures and unions. Fields no longer overlap.

.. date: 2022-08-05-19-41-20 .. gh-issue: 87135 .. nonce: SCNBYj .. section: C API

Attempting to acquire the GIL after runtime finalization has begun in a different thread now causes the thread to hang rather than terminate, which avoids potential crashes or memory corruption caused by attempting to terminate a thread that is running code not specifically designed to support termination. In most cases this hanging is harmless since the process will soon exit anyway.

The PyThread_exit_thread function is now deprecated. Its behavior is inconsistent across platforms, and it can only be used safely in the unlikely case that every function in the entire call stack has been designed to support the platform-dependent termination mechanism. It is recommended that users of this function change their design to not require thread termination. In the unlikely case that thread termination is needed and can be done safely, users may migrate to calling platform-specific APIs such as pthread_exit (POSIX) or _endthreadex (Windows) directly.

.. bpo: 34008 .. date: 2018-06-30-21-48-16 .. nonce: 2Wjtm0 .. section: C API

Added Py_IsInitialized to the list of APIs that are safe to call before the interpreter is initialized, and updated the embedding tests to cover it.

.. date: 2024-10-13-21-11-30 .. gh-issue: 125269 .. nonce: BC-fdo .. section: Build

Fix detection of whether -latomic is needed when cross-compiling CPython using the configure script.

.. date: 2024-09-23-11-27-25 .. gh-issue: 123990 .. nonce: d6HrYC .. section: Build

Remove WITH_FREELISTS macro and --without-freelists build configuration

.. date: 2024-09-16-09-42-05 .. gh-issue: 124102 .. nonce: Ow254j .. section: Build

Update internal documentation under PCbuild, so it now correctly states that Windows requires VS2017 or later and Python 3.10 or later

.. date: 2024-09-13-17-48-37 .. gh-issue: 124043 .. nonce: Bruxpq .. section: Build

Building using :option:--with-trace-refs is (temporarily) disallowed when the GIL is disabled.

.. date: 2024-09-04-12-01-43 .. gh-issue: 123418 .. nonce: ynzspB .. section: Build

Updated Android build to use OpenSSL 3.0.15.

.. date: 2024-08-24-19-09-31 .. gh-issue: 123297 .. nonce: fdtXoe .. section: Build

Propagate the value of LDFLAGS to LDCXXSHARED in :mod:sysconfig. Patch by Pablo Galindo

.. date: 2024-08-14-19-17-34 .. gh-issue: 121634 .. nonce: eOMfHG .. section: Build

Allow for specifying the target compile triple for WASI.

.. date: 2024-08-12-15-48-49 .. gh-issue: 122578 .. nonce: YJ3xEa .. section: Build

Use WASI SDK 24 for testing.

.. date: 2024-08-07-00-20-18 .. gh-issue: 116622 .. nonce: U9cxHM .. section: Build

Rename build variable MODULE_LDFLAGS back to LIBPYTHON, as it's used by package build systems (e.g. Meson).

.. date: 2024-08-02-12-59-15 .. gh-issue: 118943 .. nonce: vZQtET .. section: Build

Fix an issue where the experimental JIT could be built several times by the make regen-all target, leading to possible race conditions on heavily parallelized builds.

.. date: 2024-07-19-10-14-31 .. gh-issue: 121996 .. nonce: IEb2sz .. section: Build

Introduce ./configure --disable-safety and --enable-slower-safety options. Patch by Donghee Na.

.. date: 2024-07-18-07-53-07 .. gh-issue: 120522 .. nonce: dg3o5A .. section: Build

Added a :option:--with-app-store-compliance option to patch out known issues with macOS/iOS App Store review processes.

.. date: 2024-07-16-12-29-54 .. gh-issue: 120371 .. nonce: E7x858 .. section: Build

Support WASI SDK 22 by explicitly skipping functions that are just stubs in wasi-libc.

.. date: 2024-07-14-01-29-47 .. gh-issue: 121731 .. nonce: RMPGP3 .. section: Build

Fix mimalloc compile error on GNU/Hurd

.. date: 2024-07-08-14-01-17 .. gh-issue: 121487 .. nonce: ekHmpR .. section: Build

Fix deprecation warning for ATOMIC_VAR_INIT in mimalloc.

.. date: 2024-07-08-01-11-54 .. gh-issue: 121467 .. nonce: 3qWRQj .. section: Build

Fix a Makefile bug that prevented mimalloc header files from being installed.

.. date: 2024-07-02-20-16-09 .. gh-issue: 121103 .. nonce: TMef9j .. section: Build

On POSIX systems, excluding macOS framework installs, the lib directory for the free-threaded build now includes a "t" suffix to avoid conflicts with a co-located default build installation.

.. date: 2024-07-02-12-42-25 .. gh-issue: 120831 .. nonce: i3eIjg .. section: Build

The default minimum iOS version was increased to 13.0.

.. date: 2024-06-27-18-03-20 .. gh-issue: 121082 .. nonce: w3AfRx .. section: Build

Fix build failure when the developer use --enable-pystats arguments in configuration command after #118450.

.. date: 2024-06-21-09-24-03 .. gh-issue: 120671 .. nonce: Z8sBQB .. section: Build

Fix failing configure tests due to a missing space when appending to CFLAGS.

.. date: 2024-06-19-21-05-15 .. gh-issue: 120602 .. nonce: UyDARz .. section: Build

Correctly handle LLVM installs with LLVM_VERSION_SUFFIX when building with --enable-experimental-jit.

.. date: 2024-06-18-15-32-36 .. gh-issue: 120688 .. nonce: tjIPLD .. section: Build

On WASI in debug mode, Python is now built with compiler flag -O3 instead of -Og, to support more recursive calls. Patch by Victor Stinner.

.. date: 2024-06-18-15-28-25 .. gh-issue: 118943 .. nonce: aie7nn .. section: Build

Fix a possible race condition affecting parallel builds configured with --enable-experimental-jit, in which :exc:FileNotFoundError could be caused by another process already moving jit_stencils.h.new to jit_stencils.h.

.. date: 2024-06-11-00-38-05 .. gh-issue: 120326 .. nonce: JHSDF1 .. section: Build

On Windows, fix build error when --disable-gil and --experimental-jit options are combined.

.. date: 2024-06-09-15-54-22 .. gh-issue: 120291 .. nonce: IpfHzE .. section: Build

Make the python-config shell script compatible with non-bash shells.

.. date: 2024-06-02-13-23-26 .. gh-issue: 113565 .. nonce: 8xBlId .. section: Build

Improve :mod:curses and :mod:curses.panel dependency checks in :program:configure.

.. date: 2024-05-29-17-40-50 .. gh-issue: 119729 .. nonce: k0xJ5U .. section: Build

On POSIX systems, the pkg-config (.pc) filenames now include the ABI flags, which may include debug ("d") and free-threaded ("t"). For example:

python-3.14.pc (default, non-debug build) * python-3.14d.pc (default, debug build) * python-3.14t.pc (free-threaded build)

.. date: 2024-05-22-13-18-02 .. gh-issue: 119400 .. nonce: WEt83v .. section: Build

make_ssl_certs, the script that prepares certificate data for the test suite, now allows specifying expiration dates.

.. date: 2024-05-19-22-54-55 .. gh-issue: 115119 .. nonce: DwMwev .. section: Build

Fall back to the bundled libmpdec if a system version cannot be found.

.. date: 2024-05-17-19-53-27 .. gh-issue: 119132 .. nonce: wepPgM .. section: Build

Update :data:sys.version to identify whether the build is default build or free-threading build. Patch By Donghee Na.

.. date: 2024-05-13-15-57-58 .. gh-issue: 118836 .. nonce: 7yN1iB .. section: Build

Fix an AssertionError when building with --enable-experimental-jit and the compiler emits a SHT_NOTE section.

.. date: 2024-05-11-15-11-30 .. gh-issue: 118943 .. nonce: VI_MnY .. section: Build

Fix a possible race condition affecting parallel builds configured with --enable-experimental-jit, in which compilation errors could be caused by an incompletely-generated header file.