3.12.0a5 - Cpython — ContextQMD

.. date: 2022-11-08-12-06-52 .. gh-issue: 99108 .. nonce: 4Wrsuh .. release date: 2023-02-07 .. section: Security

Replace the builtin :mod:hashlib implementations of SHA2-224 and SHA2-256 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: 2023-02-06-20-13-36 .. gh-issue: 92173 .. nonce: RQE0mk .. section: Core and Builtins

Fix the defs and kwdefs arguments to :c:func:PyEval_EvalCodeEx and a reference leak in that function.

.. date: 2023-01-30-11-56-09 .. gh-issue: 59956 .. nonce: 7xqnC_ .. section: Core and Builtins

The GILState API is now partially compatible with subinterpreters. Previously, PyThreadState_GET() and PyGILState_GetThisThreadState() would get out of sync, causing inconsistent behavior and crashes.

.. date: 2023-01-30-08-59-47 .. gh-issue: 101400 .. nonce: Di_ZFm .. section: Core and Builtins

Fix wrong lineno in exception message on :keyword:continue or :keyword:break which are not in a loop. Patch by Donghee Na.

.. date: 2023-01-28-20-31-42 .. gh-issue: 101372 .. nonce: 8BcpCC .. section: Core and Builtins

Fix :func:~unicodedata.is_normalized to properly handle the UCD 3.2.0 cases. Patch by Donghee Na.

.. date: 2023-01-28-13-11-52 .. gh-issue: 101266 .. nonce: AxV3OF .. section: Core and Builtins

Fix :func:sys.getsizeof reporting for :class:int subclasses.

.. date: 2023-01-24-17-13-32 .. gh-issue: 101291 .. nonce: Yr6u_c .. section: Core and Builtins

Refactor the PyLongObject struct into a normal Python object header and a PyLongValue struct.

.. date: 2023-01-15-03-26-04 .. gh-issue: 101046 .. nonce: g2CM4S .. section: Core and Builtins

Fix a possible memory leak in the parser when raising :exc:MemoryError. Patch by Pablo Galindo

.. date: 2023-01-14-17-03-08 .. gh-issue: 101037 .. nonce: 9ATNuf .. section: Core and Builtins

Fix potential memory underallocation issue for instances of :class:int subclasses with value zero.

.. date: 2023-01-13-12-56-20 .. gh-issue: 100762 .. nonce: YvHaQJ .. section: Core and Builtins

Record the (virtual) exception block depth in the oparg of :opcode:YIELD_VALUE. Use this to avoid the expensive throw() when closing generators (and coroutines) that can be closed trivially.

.. date: 2023-01-12-13-46-49 .. gh-issue: 100982 .. nonce: mJ234s .. section: Core and Builtins

Adds a new :opcode:COMPARE_AND_BRANCH instruction. This is a bit more efficient when performing a comparison immediately followed by a branch, and restores the design intent of PEP 659 that specializations are local to a single instruction.

.. date: 2023-01-11-22-52-19 .. gh-issue: 100942 .. nonce: ontOy_ .. section: Core and Builtins

Fixed segfault in property.getter/setter/deleter that occurred when a property subclass overrode the __new__ method to return a non-property instance.

.. date: 2023-01-10-16-59-33 .. gh-issue: 100923 .. nonce: ypJAX- .. section: Core and Builtins

Remove the mask cache entry for the :opcode:COMPARE_OP instruction and embed the mask into the oparg.

.. date: 2023-01-10-14-11-17 .. gh-issue: 100892 .. nonce: qfBVYI .. section: Core and Builtins

Fix race while iterating over thread states in clearing :class:threading.local. Patch by Kumar Aditya.

.. date: 2023-01-06-09-22-21 .. gh-issue: 91351 .. nonce: iq2vZ_ .. section: Core and Builtins

Fix a case where re-entrant imports could corrupt the import deadlock detection code and cause a :exc:KeyError to be raised out of :mod:importlib/_bootstrap. In addition to the straightforward cases, this could also happen when garbage collection leads to a warning being emitted -- as happens when it collects an open socket or file)

.. date: 2023-01-03-20-59-20 .. gh-issue: 100726 .. nonce: W9huFl .. section: Core and Builtins

Optimize construction of range object for medium size integers.

.. date: 2023-01-03-14-33-23 .. gh-issue: 100712 .. nonce: po6xyB .. section: Core and Builtins

Added option to build cpython with specialization disabled, by setting ENABLE_SPECIALIZATION=False in :mod:opcode, followed by make regen-all.

.. bpo: 32780 .. date: 2018-02-05-21-54-46 .. nonce: Dtiz8z .. section: Library

Inter-field padding is now inserted into the PEP3118 format strings obtained from :class:ctypes.Structure objects, reflecting their true representation in memory.

.. date: 2023-02-05-14-39-49 .. gh-issue: 101541 .. nonce: Mo3ppp .. section: Library

[Enum] - fix psuedo-flag creation

.. date: 2023-02-04-21-01-49 .. gh-issue: 101570 .. nonce: lbtUsD .. section: Library

Upgrade pip wheel bundled with ensurepip (pip 23.0)

.. date: 2023-01-26-06-44-35 .. gh-issue: 101323 .. nonce: h8Hk11 .. section: Library

Fix a bug where errors where not thrown by zlib._ZlibDecompressor if encountered during decompressing.

.. date: 2023-01-26-01-25-56 .. gh-issue: 101317 .. nonce: vWaS1x .. section: Library

Add ssl_shutdown_timeout parameter for :meth:asyncio.StreamWriter.start_tls.

.. date: 2023-01-25-18-07-20 .. gh-issue: 101326 .. nonce: KL4SFv .. section: Library

Fix regression when passing None as second or third argument to FutureIter.throw.

.. date: 2023-01-24-12-53-59 .. gh-issue: 92123 .. nonce: jf6TO5 .. section: Library

Adapt the _elementtree extension module to multi-phase init (:pep:489). Patches by Erlend E. Aasland.

.. date: 2023-01-21-16-50-22 .. gh-issue: 100795 .. nonce: NPMZf7 .. section: Library

Avoid potential unexpected freeaddrinfo call (double free) in :mod:socket when a libc getaddrinfo() implementation leaves garbage in an output pointer when returning an error. Original patch by Sergey G. Brester.

.. date: 2023-01-20-10-46-59 .. gh-issue: 101143 .. nonce: hJo8hu .. section: Library

Remove unused references to :class:~asyncio.TimerHandle in asyncio.base_events.BaseEventLoop._add_callback.

.. date: 2023-01-18-17-58-50 .. gh-issue: 101144 .. nonce: FHd8Un .. section: Library

Make :func:zipfile.Path.open and :func:zipfile.Path.read_text also accept encoding as a positional argument. This was the behavior in Python 3.9 and earlier. 3.10 introduced a regression where supplying it as a positional argument would lead to a :exc:TypeError.

.. date: 2023-01-15-09-11-30 .. gh-issue: 94518 .. nonce: jvxtxm .. section: Library

Group-related variables of _posixsubprocess module are renamed to stress that supplementary group affinity is added to a fork, not replace the inherited ones. Patch by Oleg Iarygin.

.. date: 2023-01-14-12-58-21 .. gh-issue: 101015 .. nonce: stWFid .. section: Library

Fix :func:typing.get_type_hints on '*tuple[...]' and *tuple[...]. It must not drop the Unpack part.

.. date: 2023-01-12-21-22-20 .. gh-issue: 101000 .. nonce: wz4Xgc .. section: Library

Add :func:os.path.splitroot, which splits a path into a 3-item tuple (drive, root, tail). This new function is used by :mod:pathlib to improve the performance of path construction by up to a third.

.. date: 2023-01-12-01-18-13 .. gh-issue: 100573 .. nonce: KDskqo .. section: Library

Fix a Windows :mod:asyncio bug with named pipes where a client doing os.stat() on the pipe would cause an error in the server that disabled serving future requests.

.. date: 2023-01-08-00-12-44 .. gh-issue: 39615 .. nonce: gn4PhB .. section: Library

:func:warnings.warn now has the ability to skip stack frames based on code filename prefix rather than only a numeric stacklevel via the new skip_file_prefixes keyword argument.

.. date: 2023-01-04-14-42-59 .. gh-issue: 100750 .. nonce: iFJs5Y .. section: Library

pass encoding kwarg to subprocess in platform

.. date: 2022-12-21-17-49-50 .. gh-issue: 100160 .. nonce: N0NHRj .. section: Library

Emit a deprecation warning in :meth:asyncio.DefaultEventLoopPolicy.get_event_loop if there is no current event loop set and it decides to create one.

.. date: 2022-12-19-23-19-26 .. gh-issue: 96290 .. nonce: qFjsi6 .. section: Library

Fix handling of partial and invalid UNC drives in ntpath.splitdrive(), and in ntpath.normpath() on non-Windows systems. Paths such as '\server' and '\' are now considered by splitdrive() to contain only a drive, and consequently are not modified by normpath() on non-Windows systems. The behaviour of normpath() on Windows systems is unaffected, as native OS APIs are used. Patch by Eryk Sun, with contributions by Barney Gale.

.. date: 2022-12-11-14-38-59 .. gh-issue: 99952 .. nonce: IYGLzr .. section: Library

Fix a reference undercounting issue in :class:ctypes.Structure with from_param() results larger than a C pointer.

.. date: 2022-12-10-15-30-17 .. gh-issue: 67790 .. nonce: P9YUZM .. section: Library

Add float-style formatting support for :class:fractions.Fraction instances.

.. date: 2022-11-24-21-52-31 .. gh-issue: 99266 .. nonce: 88GcV9 .. section: Library

Preserve more detailed error messages in :mod:ctypes.

.. date: 2022-11-15-23-30-39 .. gh-issue: 86682 .. nonce: gK9i1N .. section: Library

Ensure runtime-created collections have the correct module name using the newly added (internal) :func:sys._getframemodulename.

.. date: 2022-11-14-03-06-03 .. gh-issue: 88597 .. nonce: EYJA-Q .. section: Library

:mod:uuid now has a command line interface. Try python -m uuid -h.

.. date: 2022-09-26-21-18-47 .. gh-issue: 60580 .. nonce: 0hBgde .. section: Library

:data:ctypes.wintypes.BYTE definition changed from :data:~ctypes.c_byte to :data:~ctypes.c_ubyte to match Windows SDK. Patch by Anatoly Techtonik and Oleg Iarygin.

.. date: 2022-07-22-13-38-37 .. gh-issue: 94518 .. nonce: _ZP0cz .. section: Library

_posixsubprocess now initializes all UID and GID variables using a reserved -1 value instead of a separate flag. Patch by Oleg Iarygin.

.. bpo: 38941 .. date: 2022-02-05-12-01-58 .. nonce: 8IhvyG .. section: Library

The :mod:xml.etree.ElementTree module now emits :exc:DeprecationWarning when testing the truth value of an :class:xml.etree.ElementTree.Element. Before, the Python implementation emitted :exc:FutureWarning, and the C implementation emitted nothing.

.. bpo: 40077 .. date: 2020-11-20-21-06-08 .. nonce: M-iZq3 .. section: Library

Convert :mod:elementtree types to heap types. Patch by Erlend E. Aasland.

.. bpo: 29847 .. date: 2020-04-18-17-45-03 .. nonce: Uxtbq0 .. section: Library

Fix a bug where :class:pathlib.Path accepted and ignored keyword arguments. Patch provided by Yurii Karabas.

.. date: 2018-05-21-17-18-00 .. gh-issue: 77772 .. nonce: Fhg84L .. section: Library

:class:ctypes.CDLL, :class:ctypes.OleDLL, :class:ctypes.WinDLL, and :class:ctypes.PyDLL now accept :term:path-like objects <path-like object> as their name argument. Patch by Robert Hoelzl.

.. date: 2022-06-19-22-04-47 .. gh-issue: 88324 .. nonce: GHhSQ1 .. section: Documentation

Reword :mod:subprocess to emphasize default behavior of stdin, stdout, and stderr arguments. Remove inaccurate statement about child file handle inheritance.

.. date: 2023-02-04-17-24-33 .. gh-issue: 101334 .. nonce: _yOqwg .. section: Tests

test_tarfile has been updated to pass when run as a high UID.

.. date: 2023-02-04-06-59-07 .. gh-issue: 101282 .. nonce: 7sQz5l .. section: Build

Update BOLT configuration not to use deprecated usage of --split functions. Patch by Donghee Na.

.. date: 2023-02-02-23-43-46 .. gh-issue: 101522 .. nonce: lnUDta .. section: Build

Allow overriding Windows dependencies versions and paths using MSBuild properties.

.. date: 2023-01-26-19-02-11 .. gh-issue: 77532 .. nonce: cXD8bg .. section: Build

Minor fixes to allow building with PlatformToolset=ClangCL on Windows.

.. date: 2023-01-21-10-31-35 .. gh-issue: 101152 .. nonce: xvM8pL .. section: Build

In accordance with :PEP:699, the ma_version_tag field in :c:type:PyDictObject is deprecated for extension modules. Accessing this field will generate a compiler warning at compile time. This field will be removed in Python 3.14.

.. date: 2023-01-17-21-32-51 .. gh-issue: 100340 .. nonce: i9zRGM .. section: Build

Allows -Wno-int-conversion for wasm-sdk 17 and onwards, thus enables building WASI builds once against the latest sdk.

.. date: 2023-01-15-11-22-15 .. gh-issue: 101060 .. nonce: 0mYk9E .. section: Build

Conditionally add -fno-reorder-blocks-and-partition in configure. Effectively fixes --enable-bolt when using Clang, as this appears to be a GCC-only flag.

.. date: 2022-10-27-09-57-12 .. gh-issue: 98705 .. nonce: H11XmR .. section: Build

__bool__ is defined in AIX system header files which breaks the build in AIX, so undefine it.

.. date: 2022-10-25-11-53-55 .. gh-issue: 98636 .. nonce: e0RPAr .. section: Build

Fix a regression in detecting gdbm_compat library for the _gdbm module build.

.. date: 2022-08-30-10-16-31 .. gh-issue: 96305 .. nonce: 274i8B .. section: Build

_aix_support now uses a simple code to get platform details rather than the now non-existent _bootsubprocess during bootstrap.

.. date: 2023-02-03-17-53-06 .. gh-issue: 101543 .. nonce: cORAT4 .. section: Windows

Ensure the install path in the registry is only used when the standard library hasn't been located in any other way.

.. date: 2023-01-31-16-50-07 .. gh-issue: 101467 .. nonce: ye9t-L .. section: Windows

The py.exe launcher now correctly filters when only a single runtime is installed. It also correctly handles prefix matches on tags so that -3.1 does not match 3.11, but would still match 3.1-32.

.. date: 2023-01-25-00-23-31 .. gh-issue: 99834 .. nonce: WN41lc .. section: Windows

Updates bundled copy of Tcl/Tk to 8.6.13.0

.. date: 2023-01-18-18-25-18 .. gh-issue: 101135 .. nonce: HF9VlG .. section: Windows

Restore ability to launch older 32-bit versions from the :file:py.exe launcher when both 32-bit and 64-bit installs of the same version are available.

.. date: 2023-01-17-18-17-58 .. gh-issue: 82052 .. nonce: mWyysT .. section: Windows

Fixed an issue where writing more than 32K of Unicode output to the console screen in one go can result in mojibake.

.. date: 2023-01-11-16-28-09 .. gh-issue: 100320 .. nonce: 2DU2it .. section: Windows

Ensures the PythonPath registry key from an install is used when launching from a different copy of Python that relies on an existing install to provide a copy of its modules and standard library.

.. date: 2023-01-11-14-42-11 .. gh-issue: 100247 .. nonce: YfEmSz .. section: Windows

Restores support for the :file:py.exe launcher finding shebang commands in its configuration file using the full command name.