.. 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 `_. .. .. 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* `_ 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 `_, 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 `_, 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 ` 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 formating 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.