3.12.0a6 - Cpython — ContextQMD

.. date: 2023-02-17-10-42-48 .. gh-issue: 99108 .. nonce: MKA8-f .. release date: 2023-03-07 .. section: Security

Replace builtin hashlib implementations of MD5 and SHA1 with verified ones from the HACL* project.

.. date: 2023-02-08-22-03-04 .. gh-issue: 101727 .. nonce: 9P5eZz .. section: Security

Updated the OpenSSL version used in Windows and macOS binary release builds to 1.1.1t to address :cve:2023-0286, :cve:2022-4303, and :cve:2022-4303 per the OpenSSL 2023-02-07 security advisory <https://openssl-library.org/news/secadv/20230207.txt>_.

.. date: 2023-02-08-12-57-35 .. gh-issue: 99108 .. nonce: 6tnmhA .. section: Security

Replace the builtin :mod:hashlib implementations of SHA2-384 and SHA2-512 originally from LibTomCrypt with formally verified, side-channel resistant code from the HACL* <https://github.com/hacl-star/hacl-star/>_ project. The builtins remain a fallback only used when OpenSSL does not provide them.

.. date: 2023-01-24-16-12-00 .. gh-issue: 101283 .. nonce: 9tqu39 .. section: Security

:class:subprocess.Popen now uses a safer approach to find cmd.exe when launching with shell=True. Patch by Eryk Sun, based on a patch by Oleg Iarygin.

.. date: 2023-03-07-16-56-28 .. gh-issue: 102493 .. nonce: gTXrcD .. section: Core and Builtins

Fix regression in semantics of normalisation in PyErr_SetObject.

.. date: 2023-03-06-13-05-33 .. gh-issue: 102416 .. nonce: dz6K5f .. section: Core and Builtins

Do not memoize incorrectly automatically generated loop rules in the parser. Patch by Pablo Galindo.

.. date: 2023-03-04-20-56-12 .. gh-issue: 102356 .. nonce: 07KvUd .. section: Core and Builtins

Fix a bug that caused a crash when deallocating deeply nested filter objects. Patch by Marta Gómez Macías.

.. date: 2023-02-28-21-17-03 .. gh-issue: 102336 .. nonce: -wL3Tm .. section: Core and Builtins

Cleanup Windows 7 specific special handling. Patch by Max Bachmann.

.. date: 2023-02-26-23-10-32 .. gh-issue: 102250 .. nonce: 7MUKoC .. section: Core and Builtins

Fixed a segfault occurring when the interpreter calls a __bool__ method that raises.

.. date: 2023-02-24-17-59-39 .. gh-issue: 102126 .. nonce: HTT8Vc .. section: Core and Builtins

Fix deadlock at shutdown when clearing thread states if any finalizer tries to acquire the runtime head lock. Patch by Kumar Aditya.

.. date: 2023-02-22-15-15-32 .. gh-issue: 102027 .. nonce: Km4G-d .. section: Core and Builtins

Use GetCurrentProcessId on Windows when getpid is unavailable. Patch by Max Bachmann.

.. date: 2023-02-20-15-18-33 .. gh-issue: 102056 .. nonce: uHKuwH .. section: Core and Builtins

Fix error handling bugs in interpreter's exception printing code, which could cause a crash on infinite recursion.

.. date: 2023-02-17-10-12-13 .. gh-issue: 100982 .. nonce: mJGJQw .. section: Core and Builtins

Restrict the scope of the :opcode:FOR_ITER_RANGE instruction to the scope of the original :opcode:FOR_ITER instruction, to allow instrumentation.

.. date: 2023-02-16-23-19-01 .. gh-issue: 101967 .. nonce: Kqr1dz .. section: Core and Builtins

Fix possible segfault in positional_only_passed_as_keyword function, when new list created.

.. date: 2023-02-16-16-57-23 .. gh-issue: 101952 .. nonce: Zo1dlq .. section: Core and Builtins

Fix possible segfault in BUILD_SET opcode, when new set created.

.. date: 2023-02-13-22-21-58 .. gh-issue: 74895 .. nonce: esMNtq .. section: Core and Builtins

:mod:socket.getaddrinfo no longer raises :class:OverflowError for :class:int port values outside of the C long range. Out of range values are left up to the underlying string based C library API to report. A :class:socket.gaierror SAI_SERVICE may occur instead, or no error at all as not all platform C libraries generate an error.

.. date: 2023-02-13-18-21-14 .. gh-issue: 101799 .. nonce: wpHbCn .. section: Core and Builtins

Add :opcode:CALL_INTRINSIC_2 and use it instead of :opcode:!PREP_RERAISE_STAR.

.. date: 2023-02-12-22-40-22 .. gh-issue: 101857 .. nonce: _bribG .. section: Core and Builtins

Fix xattr support detection on Linux systems by widening the check to linux, not just glibc. This fixes support for musl.

.. date: 2023-02-11-23-14-06 .. gh-issue: 84783 .. nonce: _P5sMa .. section: Core and Builtins

Make the slice object hashable. Patch by Will Bradshaw and Furkan Onder.

.. date: 2023-02-10-15-54-57 .. gh-issue: 87849 .. nonce: IUVvPz .. section: Core and Builtins

Change the SEND instruction to leave the receiver on the stack. This allows the specialized form of SEND to skip the chain of C calls and jump directly to the RESUME in the generator or coroutine.

.. date: 2023-02-10-07-21-47 .. gh-issue: 101765 .. nonce: MO5LlC .. section: Core and Builtins

Fix SystemError / segmentation fault in iter __reduce__ when internal access of builtins.__dict__ keys mutates the iter object.

.. date: 2023-02-10-01-15-57 .. gh-issue: 101430 .. nonce: T3Gegb .. section: Core and Builtins

Update :mod:tracemalloc to handle presize of object properly. Patch by Donghee Na.

.. date: 2023-02-08-17-13-31 .. gh-issue: 101696 .. nonce: seJhTt .. section: Core and Builtins

Invalidate type version tag in _PyStaticType_Dealloc for static types, avoiding bug where a false cache hit could crash the interpreter. Patch by Kumar Aditya.

.. date: 2023-02-07-14-56-43 .. gh-issue: 101632 .. nonce: Fd1yxk .. section: Core and Builtins

Adds a new :opcode:RETURN_CONST instruction.

.. date: 2023-01-04-12-49-33 .. gh-issue: 100719 .. nonce: uRPccL .. section: Core and Builtins

Remove gi_code field from generator (and coroutine and async generator) objects as it is redundant. The frame already includes a reference to the code object.

.. date: 2022-11-02-20-23-47 .. gh-issue: 98627 .. nonce: VJkdRM .. section: Core and Builtins

When an interpreter is configured to check (and only then), importing an extension module will now fail when the extension does not support multiple interpreters (i.e. doesn't implement PEP 489 multi-phase init). This does not apply to the main interpreter, nor to subinterpreters created with Py_NewInterpreter().

.. date: 2023-03-04-14-46-47 .. gh-issue: 102302 .. nonce: -b_s6Z .. section: Library

Micro-optimise hashing of :class:inspect.Parameter, reducing the time it takes to hash an instance by around 40%.

.. date: 2023-02-28-09-52-25 .. gh-issue: 101979 .. nonce: or3hXV .. section: Library

Fix a bug where parentheses in the metavar argument to :meth:argparse.ArgumentParser.add_argument were dropped. Patch by Yeojin Kim.

.. date: 2023-02-26-12-37-17 .. gh-issue: 91038 .. nonce: S4rFH_ .. section: Library

:meth:platform.platform now has boolean default arguments.

.. date: 2023-02-23-20-39-52 .. gh-issue: 81652 .. nonce: Vxz0Mr .. section: Library

Add :const:mmap.MAP_ALIGNED_SUPER FreeBSD and :const:mmap.MAP_CONCEAL OpenBSD constants to :mod:mmap. Patch by Yeojin Kim.

.. date: 2023-02-23-15-06-01 .. gh-issue: 102179 .. nonce: P6KQ4c .. section: Library

Fix :func:os.dup2 error message for negative fds.

.. date: 2023-02-21-10-05-33 .. gh-issue: 101961 .. nonce: 7e56jh .. section: Library

For the binary mode, :func:fileinput.hookcompressed doesn't set the encoding value even if the value is None. Patch by Gihwan Kim.

.. date: 2023-02-21-07-15-41 .. gh-issue: 101936 .. nonce: QVOxHH .. section: Library

The default value of fp becomes :class:io.BytesIO if :exc:~urllib.error.HTTPError is initialized without a designated fp parameter. Patch by Long Vo.

.. date: 2023-02-17-20-24-15 .. gh-issue: 101566 .. nonce: FjgWBt .. section: Library

In zipfile, sync Path with zipp 3.14 <https://zipp.readthedocs.io/en/latest/history.html#v3-14-0>_, including fix for extractall on the underlying zipfile after being wrapped in Path.

.. date: 2023-02-17-19-00-58 .. gh-issue: 97930 .. nonce: C_nQjb .. section: Library

Apply changes from importlib_resources 5.12 <https://importlib-resources.readthedocs.io/en/latest/history.html#v5-12-0>_, including fix for MultiplexedPath to support directories in multiple namespaces (python/importlib_resources#265).

.. date: 2023-02-17-18-44-27 .. gh-issue: 101997 .. nonce: A6_blD .. section: Library

Upgrade pip wheel bundled with ensurepip (pip 23.0.1)

.. date: 2023-02-15-01-54-06 .. gh-issue: 99108 .. nonce: rjTSic .. section: Library

The built-in extension modules for :mod:hashlib SHA2 algorithms, used when OpenSSL does not provide them, now live in a single internal _sha2 module instead of separate _sha256 and _sha512 modules.

.. date: 2023-02-14-09-08-48 .. gh-issue: 101892 .. nonce: FMos8l .. section: Library

Callable iterators no longer raise :class:SystemError when the callable object exhausts the iterator but forgets to either return a sentinel value or raise :class:StopIteration.

.. date: 2023-02-13-12-55-48 .. gh-issue: 87634 .. nonce: q-SBhJ .. section: Library

Remove locking behavior from :func:functools.cached_property.

.. date: 2023-02-11-13-23-29 .. gh-issue: 97786 .. nonce: QjvQ1B .. section: Library

Fix potential undefined behaviour in corner cases of floating-point-to-time conversions.

.. date: 2023-02-10-16-02-29 .. gh-issue: 101517 .. nonce: r7S2u8 .. section: Library

Fixed bug where :mod:bdb looks up the source line with :mod:linecache with a lineno=None, which causes it to fail with an unhandled exception.

.. date: 2023-02-10-11-59-13 .. gh-issue: 101773 .. nonce: J_kI7y .. section: Library

Optimize :class:fractions.Fraction for small components. The private argument _normalize of the :class:fractions.Fraction constructor has been removed.

.. date: 2023-02-08-18-20-58 .. gh-issue: 101693 .. nonce: 4_LPXj .. section: Library

In :meth:sqlite3.Cursor.execute, :exc:DeprecationWarning is now emitted when :ref:named placeholders <sqlite3-placeholders> are used together with parameters supplied as a :term:sequence instead of as a :class:dict. Starting from Python 3.14, using named placeholders with parameters supplied as a sequence will raise a :exc:~sqlite3.ProgrammingError. Patch by Erlend E. Aasland.

.. date: 2023-02-07-22-21-46 .. gh-issue: 101446 .. nonce: -c0FdK .. section: Library

Change repr of :class:collections.OrderedDict to use regular dictionary formatting instead of pairs of keys and values.

.. date: 2023-02-07-22-20-32 .. gh-issue: 101362 .. nonce: Jlk6mt .. section: Library

Speed up :class:pathlib.PurePath construction by handling arguments more uniformly. When a :class:pathlib.Path argument is supplied, we use its string representation rather than joining its parts with :func:os.path.join.

.. date: 2023-02-07-21-16-41 .. gh-issue: 101362 .. nonce: KMQllM .. section: Library

Speed up :class:pathlib.PurePath construction by calling :func:os.path.join only when two or more arguments are given.

.. date: 2023-02-07-20-46-08 .. gh-issue: 101362 .. nonce: 2ckZ6R .. section: Library

Speed up :class:pathlib.Path construction by running the path flavour compatibility check only when pathlib is imported.

.. date: 2023-02-05-21-40-15 .. gh-issue: 85984 .. nonce: Kfzbb2 .. section: Library

Refactored the implementation of :func:pty.fork to use :func:os.login_tty.

A :exc:DeprecationWarning is now raised by pty.master_open() and pty.slave_open(). They were undocumented and deprecated long long ago in the docstring in favor of :func:pty.openpty.

.. date: 2023-02-04-16-35-46 .. gh-issue: 101561 .. nonce: Xo6pIZ .. section: Library

Add a new decorator :func:typing.override. See :pep:698 for details. Patch by Steven Troxler.

.. date: 2023-02-01-10-42-16 .. gh-issue: 63301 .. nonce: XNxSFh .. section: Library

Set exit code when :mod:tabnanny CLI exits on error.

.. date: 2023-01-27-02-53-50 .. gh-issue: 101360 .. nonce: bPB7SL .. section: Library

Fix anchor matching in :meth:pathlib.PureWindowsPath.match. Path and pattern anchors are now matched with :mod:fnmatch, just like other path parts. This allows patterns such as "*:/Users/*" to be matched.

.. date: 2023-01-25-00-14-52 .. gh-issue: 101277 .. nonce: FceHX7 .. section: Library

Remove global state from :mod:itertools module (:pep:687). Patches by Erlend E. Aasland.

.. date: 2023-01-06-21-14-41 .. gh-issue: 100809 .. nonce: I697UT .. section: Library

Fix handling of drive-relative paths (like 'C:' and 'C:foo') in :meth:pathlib.Path.absolute. This method now uses the OS API to retrieve the correct current working directory for the drive.

.. date: 2023-01-02-22-41-44 .. gh-issue: 99138 .. nonce: 17hp9U .. section: Library

Apply :pep:687 to :mod:zoneinfo. Patch by Erlend E. Aasland.

.. date: 2022-10-22-09-26-43 .. gh-issue: 96764 .. nonce: Dh9Y5L .. section: Library

:func:asyncio.wait_for now uses :func:asyncio.timeout as its underlying implementation. Patch by Kumar Aditya.

.. date: 2022-09-05-12-17-34 .. gh-issue: 88233 .. nonce: gff9qJ .. section: Library

Correctly preserve "extra" fields in zipfile regardless of their ordering relative to a zip64 "extra."

.. bpo: 23224 .. date: 2018-06-20-09-12-21 .. nonce: zxCQ13 .. section: Library

Fix segfaults when creating :class:lzma.LZMADecompressor and :class:bz2.BZ2Decompressor objects without calling __init__(), and fix leakage of locks and internal buffers when calling the __init__() methods of :class:lzma.LZMADecompressor, :class:lzma.LZMACompressor, :class:bz2.BZ2Compressor, and :class:bz2.BZ2Decompressor objects multiple times.

.. date: 2023-02-19-10-33-01 .. gh-issue: 85417 .. nonce: kYO8u3 .. section: Documentation

Update :mod:cmath documentation to clarify behaviour on branch cuts.

.. date: 2023-02-07-21-43-24 .. gh-issue: 97725 .. nonce: cuY7Cd .. section: Documentation

Fix :meth:asyncio.Task.print_stack description for file=None. Patch by Oleg Iarygin.

.. date: 2023-02-18-10-51-02 .. gh-issue: 102019 .. nonce: 0797SJ .. section: Tests

Fix deadlock on shutdown if test_current_{exception,frames} fails. Patch by Jacob Bower.

.. date: 2023-02-11-22-36-10 .. gh-issue: 85984 .. nonce: EVXjT9 .. section: Tests

Utilize new "winsize" functions from termios in pty tests.

.. date: 2023-02-11-20-28-08 .. gh-issue: 89792 .. nonce: S-Y5BZ .. section: Tests

test_tools now copies up to 10x less source data to a temporary directory during the freeze test by ignoring git metadata and other artifacts. It also limits its python build parallelism based on os.cpu_count instead of hard coding it as 8 cores.

.. date: 2023-01-12-00-49-16 .. gh-issue: 99942 .. nonce: DUR8b4 .. section: Build

On Android, in a static build, python-config in embed mode no longer incorrectly reports a library to link to.

.. date: 2022-12-20-01-06-17 .. gh-issue: 99942 .. nonce: lbmzYj .. section: Build

On Android, python.pc now correctly reports the library to link to, the same as python-config.sh.

.. date: 2022-12-18-08-33-28 .. gh-issue: 100221 .. nonce: K94Ct3 .. section: Build

Fix creating install directories in make sharedinstall if they exist outside DESTDIR already.

.. date: 2022-09-14-10-38-15 .. gh-issue: 96821 .. nonce: Zk2a9c .. section: Build

Explicitly mark C extension modules that need defined signed integer overflow, and add a configure option :option:--with-strict-overflow. Patch by Matthias Görgens and Shantanu Jain.

.. date: 2023-03-01-01-36-39 .. gh-issue: 102344 .. nonce: Dgfux4 .. section: Windows

Implement winreg.QueryValue using QueryValueEx and winreg.SetValue using SetValueEx. Patch by Max Bachmann.

.. date: 2023-02-15-11-08-10 .. gh-issue: 101881 .. nonce: fScr3m .. section: Windows

Handle read and write operations on non-blocking pipes properly on Windows.

.. date: 2023-02-13-18-05-49 .. gh-issue: 101881 .. nonce: _TnHzN .. section: Windows

Add support for the os.get_blocking() and os.set_blocking() functions on Windows.

.. date: 2023-02-13-16-32-50 .. gh-issue: 101849 .. nonce: 7lm_53 .. section: Windows

Ensures installer will correctly upgrade existing py.exe launcher installs.

.. date: 2023-02-10-14-26-05 .. gh-issue: 101763 .. nonce: RPaj7r .. section: Windows

Updates copy of libffi bundled with Windows installs to 3.4.4.

.. date: 2023-02-09-22-09-27 .. gh-issue: 101759 .. nonce: zFlqSH .. section: Windows

Update Windows installer to SQLite 3.40.1.

.. date: 2023-02-07-18-22-54 .. gh-issue: 101614 .. nonce: NjVP0n .. section: Windows

Correctly handle extensions built against debug binaries that reference python3_d.dll.

.. date: 2023-01-25-11-33-54 .. gh-issue: 101196 .. nonce: wAX_2g .. section: Windows

The functions os.path.isdir, os.path.isfile, os.path.islink and os.path.exists are now 13% to 28% faster on Windows, by making fewer Win32 API calls.

.. date: 2023-02-09-22-07-17 .. gh-issue: 101759 .. nonce: B0JP2H .. section: macOS

Update macOS installer to SQLite 3.40.1.

.. date: 2023-02-14-15-53-01 .. gh-issue: 101907 .. nonce: HgF1N2 .. section: C API

Removes use of non-standard C++ extension in public header files.

.. date: 2023-02-09-10-38-20 .. gh-issue: 99293 .. nonce: mFqfpp .. section: C API

Document that the Py_TPFLAGS_VALID_VERSION_TAG is an internal feature, should not be used, and will be removed.

.. date: 2023-02-06-16-14-30 .. gh-issue: 101578 .. nonce: PW5fA9 .. section: C API

Add :c:func:PyErr_GetRaisedException and :c:func:PyErr_SetRaisedException for saving and restoring the current exception. These functions return and accept a single exception object, rather than the triple arguments of the now-deprecated :c:func:PyErr_Fetch and :c:func:PyErr_Restore. This is less error prone and a bit more efficient.

Add :c:func:PyException_GetArgs and :c:func:PyException_SetArgs as convenience functions for retrieving and modifying the :attr:~BaseException.args passed to the exception's constructor.

.. date: 2022-04-21-17-25-22 .. gh-issue: 91744 .. nonce: FgvaMi .. section: C API

Introduced the Unstable C API tier, marking APi that is allowed to change in minor releases without a deprecation period. See :pep:689 for details.