3.11.0b1 - Cpython — ContextQMD

.. date: 2022-05-04-14-32-24 .. gh-issue: 57684 .. nonce: HrlDrM .. release date: 2022-05-06 .. section: Security

Add the :option:-P command line option and the :envvar:PYTHONSAFEPATH environment variable to not prepend a potentially unsafe path to :data:sys.path. Patch by Victor Stinner.

.. date: 2022-05-06-02-29-53 .. gh-issue: 89519 .. nonce: 4OfkRE .. section: Core and Builtins

Chaining classmethod descriptors (introduced in bpo-19072) is deprecated. It can no longer be used to wrap other descriptors such as property(). The core design of this feature was flawed, and it caused a number of downstream problems.

.. date: 2022-05-05-20-05-41 .. gh-issue: 92345 .. nonce: lnN_RA .. section: Core and Builtins

pymain_run_python() now imports readline and rlcompleter before sys.path is extended to include the current working directory of an interactive interpreter. Non-interactive interpreters are not affected.

.. bpo: 43857 .. date: 2022-05-04-11-37-20 .. nonce: WuX8p3 .. section: Core and Builtins

Improve the :exc:AttributeError message when deleting a missing attribute. Patch by Géry Ogam.

.. date: 2022-05-03-14-55-40 .. gh-issue: 92245 .. nonce: G17-5i .. section: Core and Builtins

Make sure that PEP 523 is respected in all cases. In 3.11a7, specialization may have prevented Python-to-Python calls respecting PEP 523.

.. date: 2022-05-02-17-12-49 .. gh-issue: 92203 .. nonce: -igcjS .. section: Core and Builtins

Add a closure keyword-only parameter to :func:exec. It can only be specified when exec-ing a code object that uses free variables. When specified, it must be a tuple, with exactly the number of cell variables referenced by the code object. closure has a default value of None, and it must be None if the code object doesn't refer to any free variables.

.. date: 2022-05-02-12-40-18 .. gh-issue: 91173 .. nonce: k_Dr6z .. section: Core and Builtins

Disable frozen modules in debug builds. Patch by Kumar Aditya.

.. date: 2022-05-01-16-40-07 .. gh-issue: 92114 .. nonce: 5xTlLt .. section: Core and Builtins

Improve error message when subscript a type with __class_getitem__ set to None.

.. date: 2022-05-01-10-58-38 .. gh-issue: 92112 .. nonce: lLJemu .. section: Core and Builtins

Fix crash triggered by an evil custom mro() on a metaclass.

.. date: 2022-04-30-04-26-01 .. gh-issue: 92063 .. nonce: vHnhf6 .. section: Core and Builtins

The PRECALL_METHOD_DESCRIPTOR_FAST_WITH_KEYWORDS instruction now ensures methods are called only on objects of the correct type.

.. date: 2022-04-29-02-50-41 .. gh-issue: 92031 .. nonce: 2PpaIN .. section: Core and Builtins

Deoptimize statically allocated code objects during Py_FINALIZE() so that future _PyCode_Quicken calls always start with unquickened code.

.. date: 2022-04-28-23-37-30 .. gh-issue: 92036 .. nonce: GZJAC9 .. section: Core and Builtins

Fix a crash in subinterpreters related to the garbage collector. When a subinterpreter is deleted, untrack all objects tracked by its GC. To prevent a crash in deallocator functions expecting objects to be tracked by the GC, leak a strong reference to these objects on purpose, so they are never deleted and their deallocator functions are not called. Patch by Victor Stinner.

.. date: 2022-04-28-20-19-49 .. gh-issue: 92032 .. nonce: ef-UfM .. section: Core and Builtins

The interpreter can now autocomplete soft keywords, as of now match, case, and _ (wildcard pattern) from :pep:634.

.. date: 2022-04-27-10-36-43 .. gh-issue: 87999 .. nonce: YSPHfO .. section: Core and Builtins

The warning emitted by the Python parser for a numeric literal immediately followed by keyword has been changed from deprecation warning to syntax warning.

.. date: 2022-04-26-05-05-32 .. gh-issue: 91869 .. nonce: ELbTXl .. section: Core and Builtins

Fix an issue where specialized opcodes with extended arguments could produce incorrect tracing output or lead to assertion failures.

.. date: 2022-04-23-22-08-34 .. gh-issue: 91603 .. nonce: GcWEkK .. section: Core and Builtins

Speed up :class:types.UnionType instantiation. Based on patch provided by Yurii Karabas.

.. date: 2022-04-21-16-15-24 .. gh-issue: 89373 .. nonce: A1jgLx .. section: Core and Builtins

If Python is built in debug mode, Python now ensures that deallocator functions leave the current exception unchanged. Patch by Victor Stinner.

.. date: 2022-04-20-14-43-37 .. gh-issue: 91632 .. nonce: cvUhsZ .. section: Core and Builtins

Fix a minor memory leak at exit: release the memory of the :class:generic_alias_iterator type. Patch by Donghee Na.

.. date: 2022-04-18-20-25-01 .. gh-issue: 81548 .. nonce: n3VYgp .. section: Core and Builtins

Octal escapes with value larger than 0o377 now produce a :exc:DeprecationWarning. In a future Python version they will be a :exc:SyntaxWarning and eventually a :exc:SyntaxError.

.. bpo: 43950 .. date: 2022-04-18-15-22-56 .. nonce: qrTvWL .. section: Core and Builtins

Use a single compact table for line starts, ends and column offsets. Reduces memory consumption for location info by half

.. date: 2022-04-18-07-23-48 .. gh-issue: 91102 .. nonce: vm-6g1 .. section: Core and Builtins

Use Argument Clinic for :class:EncodingMap. Patch by Oleg Iarygin.

.. date: 2022-04-18-02-45-40 .. gh-issue: 91636 .. nonce: 6DFdy_ .. section: Core and Builtins

Fixed a crash in a garbage-collection edge-case, in which a PyFunction_Type.tp_clear function could leave a python function object in an inconsistent state.

.. date: 2022-04-17-11-03-45 .. gh-issue: 91603 .. nonce: hYw1Lv .. section: Core and Builtins

Speed up :func:isinstance and :func:issubclass checks for :class:types.UnionType. Patch by Yurii Karabas.

.. date: 2022-04-17-02-55-38 .. gh-issue: 91625 .. nonce: 80CrC7 .. section: Core and Builtins

Fixed a bug in which adaptive opcodes ignored any preceding EXTENDED_ARG\ s on specialization failure.

.. date: 2022-04-16-21-54-31 .. gh-issue: 78607 .. nonce: _Y7bMm .. section: Core and Builtins

The LLTRACE special build now looks for the name __lltrace__ defined in module globals, rather than the name __ltrace__, which had been introduced as a typo.

.. date: 2022-04-15-16-57-23 .. gh-issue: 91576 .. nonce: adoDj_ .. section: Core and Builtins

Speed up iteration of ascii strings by 50%. Patch by Kumar Aditya.

.. date: 2022-04-13-22-03-04 .. gh-issue: 89279 .. nonce: -jAVxZ .. section: Core and Builtins

Improve interpreter performance on Windows by inlining a few specific macros.

.. date: 2022-04-13-11-15-09 .. gh-issue: 91502 .. nonce: 11YXHQ .. section: Core and Builtins

Add a new :c:func:!_PyFrame_IsEntryFrame API function, to check if a :c:type:PyFrameObject is an entry frame. Patch by Pablo Galindo.

.. date: 2022-04-13-07-14-30 .. gh-issue: 91266 .. nonce: 6Vkzzt .. section: Core and Builtins

Refactor the bytearray strip methods strip, lstrip and rstrip to use a common implementation.

.. date: 2022-04-12-11-56-23 .. gh-issue: 91479 .. nonce: -dyGJX .. section: Core and Builtins

Replaced the __note__ field of :exc:BaseException (added in an earlier version of 3.11) with the final design of :pep:678. Namely, :exc:BaseException gets an :meth:add_note method, and its __notes__ field is created when necessary.

.. date: 2022-04-12-09-40-57 .. gh-issue: 46055 .. nonce: IPb1HA .. section: Core and Builtins

Speed up right shift of negative integers, by removing unnecessary creation of temporaries. Original patch by Xinhang Xu, reworked by Mark Dickinson.

.. date: 2022-04-12-00-44-14 .. gh-issue: 91462 .. nonce: t8oxyd .. section: Core and Builtins

Make the interpreter's low-level tracing (lltrace) feature output more readable by displaying opcode names (rather than just numbers), and by displaying stack contents before each opcode.

.. date: 2022-04-11-18-44-19 .. gh-issue: 89455 .. nonce: d0qMYd .. section: Core and Builtins

Fixed an uninitialized bool value in the traceback printing code path that was introduced by the initial bpo-45292 exception groups work.

.. date: 2022-04-10-22-57-27 .. gh-issue: 91421 .. nonce: dHhv6U .. section: Core and Builtins

Fix a potential integer overflow in _Py_DecodeUTF8Ex.

.. date: 2022-04-10-18-47-21 .. gh-issue: 91428 .. nonce: ZewV-M .. section: Core and Builtins

Add static const char *const _PyOpcode_OpName[256] = {...}; to opcode.h for debug builds to assist in debugging the Python interpreter. It is now more convenient to make various forms of debugging output more human-readable by including opcode names rather than just the corresponding decimal digits.

.. bpo: 47120 .. date: 2022-04-06-22-50-31 .. nonce: mbfHs5 .. section: Core and Builtins

Make :opcode:POP_JUMP_IF_TRUE, :opcode:POP_JUMP_IF_FALSE, :opcode:POP_JUMP_IF_NONE and :opcode:POP_JUMP_IF_NOT_NONE virtual, mapping to new relative jump opcodes.

.. bpo: 45317 .. date: 2022-04-04-15-12-38 .. nonce: UDLOt8 .. section: Core and Builtins

Add internal documentation explaining design of new (for 3.11) frame stack.

.. bpo: 47197 .. date: 2022-04-03-17-21-04 .. nonce: Ji_c30 .. section: Library

ctypes used to mishandle void return types, so that for instance a function declared like ctypes.CFUNCTYPE(None, ctypes.c_int) would be called with signature int f(int) instead of void f(int). Wasm targets require function pointers to be called with the correct signatures so this led to crashes. The problem is now fixed.

.. bpo: 47120 .. date: 2022-03-31-14-33-48 .. nonce: 6S_uoU .. section: Core and Builtins

Make opcodes :opcode:!JUMP_IF_TRUE_OR_POP and :opcode:!JUMP_IF_FALSE_OR_POP relative rather than absolute.

.. bpo: 47177 .. date: 2022-03-31-01-30-03 .. nonce: fQqaov .. section: Core and Builtins

Replace the f_lasti member of the internal _PyInterpreterFrame structure with a prev_instr pointer, which reduces overhead in the main interpreter loop. The f_lasti attribute of Python-layer frame objects is preserved for backward-compatibility.

.. bpo: 46961 .. date: 2022-03-13-08-23-17 .. nonce: SgGCkG .. section: Core and Builtins

Integer mod/remainder operations, including the three-argument form of :func:pow, now consistently return ints from the global small integer cache when applicable.

.. bpo: 46962 .. date: 2022-03-08-21-59-57 .. nonce: UomDfz .. section: Core and Builtins

Classes and functions that unconditionally declared their docstrings ignoring the --without-doc-strings compilation flag no longer do so.

The classes affected are :class:ctypes.UnionType, :class:pickle.PickleBuffer, :class:testcapi.RecursingInfinitelyError, and :class:types.GenericAlias.

The functions affected are 24 methods in :mod:ctypes.

Patch by Oleg Iarygin.

.. bpo: 46942 .. date: 2022-03-07-11-51-51 .. nonce: 57obVi .. section: Core and Builtins

Use Argument Clinic for the :class:types.MethodType constructor. Patch by Oleg Iarygin.

.. bpo: 46764 .. date: 2022-02-16-03-23-38 .. nonce: wEY4bS .. section: Core and Builtins

Fix wrapping bound methods with @classmethod

.. bpo: 43464 .. date: 2022-02-13-21-53-29 .. nonce: yupHjd .. section: Core and Builtins

Optimize :meth:set.intersection for non-set arguments.

.. bpo: 46721 .. date: 2022-02-11-17-16-30 .. nonce: JkHaLF .. section: Core and Builtins

Optimize :meth:set.issuperset for non-set argument.

.. bpo: 46509 .. date: 2022-01-25-05-39-38 .. nonce: ljrqrc .. section: Core and Builtins

Add type-specialized versions of the Py_DECREF(), and use them for float, int, str, bool, and None to avoid pointer-chasing at runtime where types are known at C compile time.

.. bpo: 46045 .. date: 2021-12-11-11-36-48 .. nonce: sfThay .. section: Build

Do not use POSIX semaphores on NetBSD

.. bpo: 36819 .. date: 2021-09-28-10-58-30 .. nonce: cyV50C .. section: Core and Builtins

Fix crashes in built-in encoders with error handlers that return position less or equal than the starting position of non-encodable characters.

.. bpo: 34093 .. date: 2018-07-14-16-58-00 .. nonce: WaVD-f .. section: Core and Builtins

marshal.dumps() uses FLAG_REF for all interned strings. This makes output more deterministic and helps reproducible build.

.. bpo: 26579 .. date: 2017-07-23-11-28-45 .. nonce: lpCY8R .. section: Core and Builtins

Added object.__getstate__ which provides the default implementation of the __getstate__() method.

Copying and pickling instances of subclasses of builtin types bytearray, set, frozenset, collections.OrderedDict, collections.deque, weakref.WeakSet, and datetime.tzinfo now copies and pickles instance attributes implemented as slots.

.. date: 2022-05-06-13-53-10 .. gh-issue: 87901 .. nonce: NnkUVr .. section: Library

Add the encoding parameter to :func:os.popen.

.. date: 2022-05-06-09-48-07 .. gh-issue: 90997 .. nonce: 4PmCgX .. section: Library

Fix an issue where :mod:dis utilities may interpret populated inline cache entries as valid instructions.

.. date: 2022-05-05-22-46-52 .. gh-issue: 92332 .. nonce: Fv9CJx .. section: Library

Deprecate :class:typing.Text (removal of the class is currently not planned). Patch by Alex Waygood.

.. gh-issue: 78157 .. date: 2022-05-05-20-40-45 .. nonce: IA_9na .. section: Library

Deprecate nested classes in enum definitions becoming members -- in 3.13 they will be normal classes; add member and nonmember functions to allow control over results now.

.. date: 2022-05-05-19-25-09 .. gh-issue: 92356 .. nonce: uvxWdu .. section: Library

Fixed a performance regression in ctypes function calls.

.. date: 2022-05-05-17-35-01 .. gh-issue: 90997 .. nonce: UV5_s0 .. section: Library

Show the actual named values stored in inline caches when show_caches=True is passed to :mod:dis utilities.

.. date: 2022-05-04-11-54-37 .. gh-issue: 92301 .. nonce: eqjoYX .. section: Library

Prefer close_range() to iterating over procfs for file descriptor closing in :mod:subprocess for better performance.

.. date: 2022-05-03-19-06-38 .. gh-issue: 67248 .. nonce: DK61Go .. section: Library

Sort the miscellaneous topics in Cmd.do_help()

.. date: 2022-05-03-17-33-46 .. gh-issue: 92210 .. nonce: csDOQM .. section: Library

Port socket.__init__ to Argument Clinic. Patch by Cinder.

.. date: 2022-05-03-12-11-27 .. gh-issue: 80010 .. nonce: yG54RE .. section: Library

Add support for generalized ISO 8601 parsing to :meth:datetime.datetime.fromisoformat, :meth:datetime.date.fromisoformat and :meth:datetime.time.fromisoformat. Patch by Paul Ganssle.

.. date: 2022-05-02-23-08-02 .. gh-issue: 92118 .. nonce: 9Mm9g4 .. section: Library

Fix a 3.11 regression in :func:~contextlib.contextmanager, which caused it to propagate exceptions with incorrect tracebacks.

.. date: 2022-05-02-18-19-46 .. gh-issue: 90887 .. nonce: zQsmfp .. section: Library

Adding COPYFILE_STAT, COPYFILE_ACL and COPYFILE_XATTR constants for :func:os.fcopyfile available in macOs.

.. date: 2022-05-02-09-09-47 .. gh-issue: 91215 .. nonce: l1p7CJ .. section: Library

For :deco:~dataclasses.dataclass, add weakref_slot. The new parameter defaults to False. If true, and if slots=True, add a slot named "__weakref__", which will allow instances to be weakref'd. Contributed by Eric V. Smith

.. date: 2022-05-02-03-56-50 .. gh-issue: 85984 .. nonce: RBivvc .. section: Library

New function os.login_tty() for Unix.

.. date: 2022-05-01-21-45-41 .. gh-issue: 92128 .. nonce: Di7VbE .. section: Library

Add :meth:~object.__class_getitem__ to :class:logging.LoggerAdapter and :class:logging.StreamHandler, allowing them to be parameterized at runtime. Patch by Alex Waygood.

.. date: 2022-04-30-10-53-10 .. gh-issue: 92049 .. nonce: 5SEKoh .. section: Library

Forbid pickling constants re._constants.SUCCESS etc. Previously, pickling did not fail, but the result could not be unpickled.

.. date: 2022-04-29-18-15-23 .. gh-issue: 92062 .. nonce: X2c_Rj .. section: Library

:class:inspect.Parameter now raises :exc:ValueError if name is a keyword, in addition to the existing check that it is an identifier.

.. date: 2022-04-29-16-41-08 .. gh-issue: 87390 .. nonce: 3LNNCv .. section: Library

Add an __unpacked__ attribute to :class:types.GenericAlias. Patch by Jelle Zijlstra.

.. date: 2022-04-28-18-45-58 .. gh-issue: 88089 .. nonce: hu9kRk .. section: Library

Add support for generic :class:typing.NamedTuple.

.. date: 2022-04-27-19-45-58 .. gh-issue: 91996 .. nonce: YEEIzk .. section: Library

New http.HTTPMethod enum to represent all the available HTTP request methods in a convenient way

.. date: 2022-04-27-18-30-00 .. gh-issue: 91984 .. nonce: LxAB11 .. section: Library

Modified test strings in test_argparse.py to not contain trailing spaces before end of line.

.. date: 2022-04-27-18-04-24 .. gh-issue: 91952 .. nonce: 9A4RXx .. section: Library

Add encoding="locale" support to :meth:TextIOWrapper.reconfigure.

.. date: 2022-04-27-13-30-26 .. gh-issue: 91954 .. nonce: cC7ga_ .. section: Library

Add encoding and errors arguments to :func:subprocess.getoutput and :func:subprocess.getstatusoutput.

.. bpo: 47029 .. date: 2022-04-26-19-01-13 .. nonce: qkT42X .. section: Library

Always close the read end of the pipe used by :class:multiprocessing.Queue after the last write of buffered data to the write end of the pipe to avoid :exc:BrokenPipeError at garbage collection and at :meth:multiprocessing.Queue.close calls. Patch by Géry Ogam.

.. date: 2022-04-26-18-02-44 .. gh-issue: 91928 .. nonce: V0YveU .. section: Library

Add datetime.UTC alias for datetime.timezone.utc.

Patch by Kabir Kwatra.

.. date: 2022-04-26-09-09-07 .. gh-issue: 68966 .. nonce: roapI2 .. section: Library

The :mod:!mailcap module is now deprecated and will be removed in Python 3.13. See :pep:594 for the rationale and the :mod:mimetypes module for an alternative. Patch by Victor Stinner.

.. date: 2022-04-25-21-33-48 .. gh-issue: 91401 .. nonce: _Jo4Bu .. section: Library

Provide a way to disable :mod:subprocess use of vfork() just in case it is ever needed and document the existing mechanism for posix_spawn().

.. date: 2022-04-25-18-30-20 .. gh-issue: 64783 .. nonce: HFtERN .. section: Library

Fix :const:signal.NSIG value on FreeBSD to accept signal numbers greater than 32, like :const:signal.SIGRTMIN and :const:signal.SIGRTMAX. Patch by Victor Stinner.

.. date: 2022-04-25-14-18-01 .. gh-issue: 91910 .. nonce: kY-JR0 .. section: Library

Add missing f prefix to f-strings in error messages from the :mod:multiprocessing and :mod:asyncio modules.

.. date: 2022-04-23-08-06-36 .. gh-issue: 91860 .. nonce: ityDjK .. section: Library

Add :func:typing.dataclass_transform, implementing :pep:681. Patch by Jelle Zijlstra.

.. date: 2022-04-23-03-24-00 .. gh-issue: 91832 .. nonce: TyLi65 .. section: Library

Add required attribute to :class:argparse.Action repr output.

.. date: 2022-04-22-19-11-31 .. gh-issue: 91827 .. nonce: 6P3gOI .. section: Library

In the :mod:tkinter module add method info_patchlevel() which returns the exact version of the Tcl library as a named tuple similar to :data:sys.version_info.

.. date: 2022-04-22-13-01-20 .. gh-issue: 84461 .. nonce: rsCiTH .. section: Library

Add :option:--enable-wasm-pthreads to enable pthreads support for WASM builds. Emscripten/node no longer has threading enabled by default. Include additional file systems.

.. date: 2022-04-22-08-25-18 .. gh-issue: 91821 .. nonce: XwMkj0 .. section: Library

Fix unstable test_from_tuple test in test_decimal.py.

.. date: 2022-04-21-21-06-54 .. gh-issue: 91217 .. nonce: 2cVma_ .. section: Library

Deprecate the xdrlib module.

.. date: 2022-04-21-21-04-08 .. gh-issue: 91217 .. nonce: BZVEki .. section: Library

Deprecate the uu module.

.. date: 2022-04-21-19-46-03 .. gh-issue: 91760 .. nonce: zDtv1E .. section: Library

More strict rules will be applied for numerical group references and group names in regular expressions. For now, a deprecation warning is emitted for group references and group names which will be errors in future Python versions.

.. date: 2022-04-21-11-57-23 .. gh-issue: 84461 .. nonce: S7dbt4 .. section: Library

Add provisional :data:sys._emscripten_info named tuple with build-time and run-time information about Emscripten platform.

.. date: 2022-04-20-18-47-27 .. gh-issue: 90623 .. nonce: 5fROpX .. section: Library

:func:signal.raise_signal and :func:os.kill now check immediately for pending signals. Patch by Victor Stinner.

.. date: 2022-04-20-09-49-33 .. gh-issue: 91734 .. nonce: 4Dj4Gy .. section: Library

Fix OSS audio support on Solaris.

.. date: 2022-04-19-19-50-10 .. gh-issue: 90633 .. nonce: Youov0 .. section: Library

Include the passed value in the exception thrown by :func:typing.assert_never. Patch by Jelle Zijlstra.

.. date: 2022-04-19-17-30-17 .. gh-issue: 91700 .. nonce: MRJi6m .. section: Library

Compilation of regular expression containing a conditional expression (?(group)...) now raises an appropriate :exc:re.error if the group number refers to not defined group. Previously an internal RuntimeError was raised.

.. date: 2022-04-19-15-30-06 .. gh-issue: 91231 .. nonce: AWy4Cs .. section: Library

Add an optional keyword shutdown_timeout parameter to the :class:multiprocessing.BaseManager constructor. Kill the process if terminate() takes longer than the timeout. Patch by Victor Stinner.

.. date: 2022-04-18-18-55-21 .. gh-issue: 91621 .. nonce: ACNlda .. section: Library

Fix :func:typing.get_type_hints for :class:collections.abc.Callable. Patch by Shantanu Jain.

.. date: 2022-04-18-16-31-33 .. gh-issue: 90568 .. nonce: 9kiU7o .. section: Library

Parsing \N escapes of Unicode Named Character Sequences in a :mod:regular expression <re> raises now :exc:re.error instead of TypeError.

.. date: 2022-04-18-15-23-24 .. gh-issue: 91670 .. nonce: 6eyChw .. section: Library

Remove deprecated SO config variable in :mod:sysconfig.

.. date: 2022-04-17-12-41-52 .. gh-issue: 91217 .. nonce: 3wnHSX .. section: Library

Deprecate the telnetlib module.

.. date: 2022-04-17-12-38-31 .. gh-issue: 91217 .. nonce: 55714p .. section: Library

Deprecate the sunau module.

.. date: 2022-04-17-12-32-40 .. gh-issue: 91217 .. nonce: ms49Rg .. section: Library

Deprecate the spwd module.

.. date: 2022-04-17-12-27-46 .. gh-issue: 91217 .. nonce: tNDWtK .. section: Library

Deprecate the sndhdr module, as well as inline needed functionality for email.mime.MIMEAudio.

.. date: 2022-04-17-12-27-25 .. gh-issue: 91616 .. nonce: gSQg69 .. section: Library

:mod:re module, fix :meth:~re.Pattern.fullmatch mismatch when using Atomic Grouping or Possessive Quantifiers.

.. date: 2022-04-17-12-07-50 .. gh-issue: 91217 .. nonce: TIvrsq .. section: Library

Deprecate the 'pipes' module.

.. date: 2022-04-17-11-56-17 .. gh-issue: 91217 .. nonce: McJre3 .. section: Library

Deprecate the ossaudiodev module.

.. bpo: 47256 .. date: 2022-04-16-11-39-59 .. nonce: 1cygyd .. section: Library

:mod:re module, limit the maximum capturing group to 1,073,741,823 in 64-bit build, this increases the depth of backtracking.

.. date: 2022-04-16-09-33-14 .. gh-issue: 91217 .. nonce: nt9JFs .. section: Library

Deprecate the nis module.

.. date: 2022-04-16-05-12-13 .. gh-issue: 91595 .. nonce: CocJBv .. section: Library

Fix the comparison of character and integer inside :func:Tools.gdb.libpython.write_repr. Patch by Yu Liu.

.. date: 2022-04-15-20-56-31 .. gh-issue: 74166 .. nonce: 70KlvL .. section: Library

Add option to raise all errors from :meth:~socket.create_connection in an :exc:ExceptionGroup when it fails to create a connection. The default remains to raise only the last error that had occurred when multiple addresses were tried.

.. date: 2022-04-15-19-34-02 .. gh-issue: 91487 .. nonce: 2aqguF .. section: Library

Optimize asyncio UDP speed, over 100 times faster when transferring a large file.

.. date: 2022-04-15-18-38-21 .. gh-issue: 91575 .. nonce: fSyAxS .. section: Library

Update case-insensitive matching in the :mod:re module to the latest Unicode version.

.. date: 2022-04-15-18-32-38 .. gh-issue: 90622 .. nonce: WQjFDe .. section: Library

In concurrent.futures.process.ProcessPoolExecutor disallow the "fork" multiprocessing start method when the new max_tasks_per_child feature is used as the mix of threads+fork can hang the child processes. Default to using the safe "spawn" start method in that circumstance if no mp_context was supplied.

.. date: 2022-04-15-17-06-09 .. gh-issue: 89022 .. nonce: DgdQCa .. section: Library

In :mod:sqlite3, SQLITE_MISUSE result codes are now mapped to :exc:~sqlite3.InterfaceError instead of :exc:~sqlite3.ProgrammingError. Also, more accurate exceptions are raised when binding parameters fail. Patch by Erlend E. Aasland.

.. date: 2022-04-14-18-06-00 .. gh-issue: 91526 .. nonce: cwfhSB .. section: Library

Stop calling os.device_encoding(file.fileno()) in :class:TextIOWrapper. It was complex, never documented, and didn't work for most cases. (Patch by Inada Naoki.)

.. date: 2022-04-14-13-11-37 .. gh-issue: 88116 .. nonce: j_SybE .. section: Library

Change the frame-related functions in the :mod:inspect module to return a regular object (that is backwards compatible with the old tuple-like interface) that include the extended :pep:657 position information (end line number, column and end column). The affected functions are: :func:inspect.getframeinfo, :func:inspect.getouterframes, :func:inspect.getinnerframes, :func:inspect.stack and :func:inspect.trace. Patch by Pablo Galindo.

.. date: 2022-04-14-01-00-31 .. gh-issue: 69093 .. nonce: bmlMwI .. section: Library

Add indexing and slicing support to :class:sqlite3.Blob. Patch by Aviv Palivoda and Erlend E. Aasland.

.. date: 2022-04-14-00-59-01 .. gh-issue: 69093 .. nonce: bmlMwI .. section: Library

Add :term:context manager support to :class:sqlite3.Blob. Patch by Aviv Palivoda and Erlend E. Aasland.

.. date: 2022-04-12-20-19-10 .. gh-issue: 91217 .. nonce: acd4h9 .. section: Library

Deprecate nntplib.

.. date: 2022-04-12-19-42-20 .. gh-issue: 91217 .. nonce: b9_Rz9 .. section: Library

Deprecate msilib.

.. date: 2022-04-12-19-08-13 .. gh-issue: 91404 .. nonce: zjqYHo .. section: Library

Improve the performance of :mod:re matching by using computed gotos (or "threaded code") on supported platforms and removing expensive pointer indirections.

.. date: 2022-04-11-17-04-38 .. gh-issue: 91217 .. nonce: QVDLOq .. section: Library

Deprecate the imghdr module.

.. date: 2022-04-11-16-13-26 .. gh-issue: 91217 .. nonce: 2rf8rc .. section: Library

Deprecate the crypt module.

.. date: 2022-04-11-13-07-30 .. gh-issue: 91276 .. nonce: Vttu15 .. section: Library

Make space for longer opcodes in :mod:dis output.

.. bpo: 47000 .. date: 2022-04-10-17-50-18 .. nonce: JlQkFx .. section: Library

Make :class:TextIOWrapper uses locale encoding when encoding="locale" is specified even in UTF-8 mode.

.. date: 2022-04-10-17-12-23 .. gh-issue: 91230 .. nonce: T1d_fG .. section: Library

:func:warnings.catch_warnings now accepts arguments for :func:warnings.simplefilter, providing a more concise way to locally ignore warnings or convert them to errors.

.. date: 2022-04-10-11-11-33 .. gh-issue: 91217 .. nonce: K82AuH .. section: Library

Deprecate the chunk module.

.. gh-issue: 91498 .. date: 2022-04-10-08-39-44 .. nonce: 8oII92 .. section: Library

Add the TCP_CONNECTION_INFO option (available on macOS) to :mod:socket.

.. bpo: 47260 .. date: 2022-04-08-14-30-53 .. nonce: TtcNxI .. section: Library

Fix os.closerange() potentially being a no-op in a Linux seccomp sandbox.

.. bpo: 47087 .. date: 2022-04-08-08-55-36 .. nonce: Q5C3EI .. section: Library

Implement typing.Required and typing.NotRequired (:pep:655). Patch by David Foster and Jelle Zijlstra.

.. bpo: 47061 .. date: 2022-04-07-20-32-47 .. nonce: TOufgh .. section: Library

Deprecate cgi and cgitb.

.. bpo: 47061 .. date: 2022-04-06-18-01-28 .. nonce: qoVTR9 .. section: Library

Deprecate audioop.

.. bpo: 47000 .. date: 2022-04-06-11-54-53 .. nonce: 2nmAR1 .. section: Library

Add :func:locale.getencoding to get the current locale encoding. It is similar to locale.getpreferredencoding(False) but ignores the :ref:Python UTF-8 Mode <utf8-mode>.

.. bpo: 42012 .. date: 2022-04-05-17-18-13 .. nonce: zMocQz .. section: Library

Add :mod:wsgiref.types, containing WSGI-specific types for static type checking.

.. bpo: 47227 .. date: 2022-04-05-15-53-58 .. nonce: 1HWdp9 .. section: Library

Suppress expression chaining for more :mod:re parsing errors.

.. bpo: 47211 .. date: 2022-04-04-11-58-07 .. nonce: W4GFkB .. section: Library

Remove undocumented and never working function re.template() and flag re.TEMPLATE. This was later reverted in 3.11.0b2 and deprecated instead.

.. bpo: 47135 .. date: 2022-04-01-21-44-00 .. nonce: TvkKB- .. section: Library

:meth:decimal.localcontext now accepts context attributes via keyword arguments

.. bpo: 43323 .. date: 2022-03-27-12-40-16 .. nonce: 9mFPuI .. section: Library

Fix errors in the :mod:email module if the charset itself contains undecodable/unencodable characters.

.. bpo: 46841 .. date: 2022-03-25-22-18-45 .. nonce: NUEsXW .. section: Library

Disassembly of quickened code.

.. bpo: 46681 .. date: 2022-03-21-13-50-07 .. nonce: RRhopn .. section: Library

Forward gzip.compress() compresslevel to zlib.

.. bpo: 45100 .. date: 2022-03-06-18-15-32 .. nonce: B_lHu0 .. section: Library

Add :func:typing.get_overloads and :func:typing.clear_overloads. Patch by Jelle Zijlstra.

.. bpo: 44807 .. date: 2022-03-02-04-25-58 .. nonce: gHNC9J .. section: Library

:class:typing.Protocol no longer silently replaces :meth:__init__ methods defined on subclasses. Patch by Adrian Garcia Badaracco.

.. bpo: 46787 .. date: 2022-02-18-20-09-29 .. nonce: juwWc0 .. section: Library

Fix :class:concurrent.futures.ProcessPoolExecutor exception memory leak

.. bpo: 46720 .. date: 2022-02-11-23-11-35 .. nonce: nY8spB .. section: Library

Add support for path-like objects to :func:multiprocessing.set_executable for Windows to be on a par with Unix-like systems. Patch by Géry Ogam.

.. bpo: 46696 .. date: 2022-02-09-21-40-02 .. nonce: nPXRno .. section: Library

Add SO_INCOMING_CPU constant to :mod:socket.

.. bpo: 46053 .. date: 2022-02-06-12-59-32 .. nonce: sHFo3S .. section: Library

Fix OSS audio support on NetBSD.

.. bpo: 45639 .. date: 2022-02-02-04-51-39 .. nonce: N8XrGO .. section: Library

image/avif and image/webp were added to :mod:mimetypes.

.. bpo: 46285 .. date: 2022-01-29-00-23-00 .. nonce: pt84qm .. section: Library

Add command-line option -p/--protocol to module :mod:http.server which specifies the HTTP version to which the server is conformant (HTTP/1.1 conformant servers can now be run from the command-line interface of module :mod:http.server). Patch by Géry Ogam.

.. bpo: 44791 .. date: 2022-01-27-14-46-15 .. nonce: tR1JFG .. section: Library

Accept ellipsis as the last argument of :data:typing.Concatenate.

.. bpo: 46547 .. date: 2022-01-27-14-41-55 .. nonce: JMyYz9 .. section: Library

Remove variables leaking into pydoc.Helper class namespace.

.. bpo: 46415 .. date: 2022-01-17-16-53-30 .. nonce: 6wSYg- .. section: Library

Fix ipaddress.ip_{address,interface,network} raising TypeError instead of ValueError if given invalid tuple as address parameter.

.. bpo: 46075 .. date: 2021-12-14-21-19-04 .. nonce: KDtcU- .. section: Library

CookieJar with DefaultCookiePolicy now can process cookies from localhost with domain=localhost explicitly specified in Set-Cookie header.

.. bpo: 45995 .. date: 2021-12-14-13-15-41 .. nonce: Am9pNL .. section: Library

Add a "z" option to the string formatting specification that coerces negative zero floating-point values to positive zero after rounding to the format precision. Contributed by John Belmonte.

.. bpo: 26175 .. date: 2021-11-14-01-35-04 .. nonce: LNlOfI .. section: Library

Fully implement the :class:io.BufferedIOBase or :class:io.TextIOBase interface for :class:tempfile.SpooledTemporaryFile objects. This lets them work correctly with higher-level layers (like compression modules). Patch by Carey Metcalfe.

.. bpo: 45138 .. date: 2021-09-08-16-21-03 .. nonce: yghUrK .. section: Library

Fix a regression in the :mod:sqlite3 trace callback where bound parameters were not expanded in the passed statement string. The regression was introduced in Python 3.10 by :issue:40318. Patch by Erlend E. Aasland.

.. bpo: 44863 .. date: 2021-09-03-07-56-48 .. nonce: udgz95 .. section: Library

Allow :class:~typing.TypedDict subclasses to also include :class:~typing.Generic as a base class in class based syntax. Thereby allowing the user to define a generic TypedDict, just like a user-defined generic but with TypedDict semantics.

.. bpo: 44587 .. date: 2021-08-17-21-41-39 .. nonce: 57OKSz .. section: Library

Fix BooleanOptionalAction to not automatically add a default string. If a default string is desired, use a formatter to add it.

.. bpo: 43827 .. date: 2021-04-16-17-32-44 .. nonce: uJaXdP .. section: Library

All positional-or-keyword parameters to ABCMeta.__new__ are now positional-only to avoid conflicts with keyword arguments to be passed to :meth:__init_subclass__.

.. bpo: 43218 .. date: 2021-02-14-20-55-53 .. nonce: VZv2M4 .. section: Library

Prevent creation of a venv whose path contains the PATH separator. This could affect the usage of the activate script. Patch by Dustin Rodrigues.

.. bpo: 38435 .. date: 2020-12-24-19-11-53 .. nonce: rEHTAR .. section: Library

Add a process_group parameter to :class:subprocess.Popen to help move more things off of the unsafe preexec_fn parameter.

.. bpo: 42066 .. date: 2020-10-19-08-50-41 .. nonce: DsB-R6 .. section: Library

Fix cookies getting sorted in :func:CookieJar.__iter__ which is an extra behavior and not mentioned in RFC 2965 or Netscape cookie protocol. Now the cookies in CookieJar follows the order of the Set-Cookie header. Patch by Iman Kermani.

.. bpo: 40617 .. date: 2020-05-24-23-52-03 .. nonce: lycF9q .. section: Library

Add :meth:~sqlite3.Connection.create_window_function to :class:sqlite3.Connection for creating aggregate window functions. Patch by Erlend E. Aasland.

.. bpo: 40676 .. date: 2020-05-19-01-40-51 .. nonce: yJfq1J .. section: Library

Convert :mod:csv to use Argument Clinic for :func:csv.field_size_limit, :func:csv.get_dialect, :func:csv.unregister_dialect and :func:csv.list_dialects.

.. bpo: 39716 .. date: 2020-02-22-12-02-11 .. nonce: z2WhDQ .. section: Library

Raise an ArgumentError when the same subparser name is added twice to an argparse.ArgumentParser. This is consistent with the (default) behavior when the same option string is added twice to an ArgumentParser.

.. bpo: 36073 .. date: 2019-06-22-11-01-45 .. nonce: ED8mB9 .. section: Library

Raise :exc:~sqlite3.ProgrammingError instead of segfaulting on recursive usage of cursors in :mod:sqlite3 converters. Patch by Sergey Fedoseev.

.. bpo: 34975 .. date: 2019-05-06-23-36-34 .. nonce: eb49jr .. section: Library

Adds a start_tls() method to :class:~asyncio.streams.StreamWriter, which upgrades the connection with TLS using the given :class:~ssl.SSLContext.

.. bpo: 22276 .. date: 2018-11-11-04-41-11 .. nonce: Tt19TW .. section: Library

:class:~pathlib.Path methods :meth:~pathlib.Path.glob and :meth:~pathlib.Path.rglob return only directories if pattern ends with a pathname components separator (/ or :data:~os.sep). Patch by Eisuke Kawashima.

.. bpo: 24905 .. date: 2018-04-18-16-15-55 .. nonce: jYqjYx .. section: Library

Add :meth:~sqlite3.Connection.blobopen to :class:sqlite3.Connection. :class:sqlite3.Blob allows incremental I/O operations on blobs. Patch by Aviv Palivoda and Erlend E. Aasland.

.. date: 2022-04-24-22-09-31 .. gh-issue: 91888 .. nonce: kTjJLx .. section: Documentation

Add a new gh role to the documentation to link to GitHub issues.

.. date: 2022-04-23-00-22-54 .. gh-issue: 91783 .. nonce: N09dRR .. section: Documentation

Document security issues concerning the use of the function :meth:shutil.unpack_archive

.. date: 2022-04-19-20-16-00 .. gh-issue: 91547 .. nonce: LsNWER .. section: Documentation

Remove "Undocumented modules" page.

.. date: 2022-04-17-03-19-51 .. gh-issue: 91298 .. nonce: NT9qHi .. section: Documentation

In importlib.resources.abc, refined the documentation of the Traversable Protocol, applying changes from importlib_resources 5.7.1.

.. bpo: 44347 .. date: 2022-04-10-20-28-20 .. nonce: Q1m3DM .. section: Documentation

Clarify the meaning of dirs_exist_ok, a kwarg of :func:shutil.copytree.

.. bpo: 36329 .. date: 2022-04-06-11-53-41 .. nonce: EVtAtK .. section: Documentation

Remove 'make -C Doc serve' in favour of 'make -C Doc htmlview'

.. bpo: 47189 .. date: 2022-04-01-23-56-13 .. nonce: Nss0Y3 .. section: Documentation

Add a What's New in Python 3.11 entry for the Faster CPython project. Documentation by Ken Jin and Kumar Aditya.

.. bpo: 38668 .. date: 2022-04-01-09-28-31 .. nonce: j4mrqW .. section: Documentation

Update the introduction to documentation for :mod:os.path to remove warnings that became irrelevant after the implementations of :pep:383 and :pep:529.

.. bpo: 47115 .. date: 2022-03-30-17-08-12 .. nonce: R3wt3i .. section: Documentation

The documentation now lists which members of C structs are part of the :ref:Limited API/Stable ABI <stable>.

.. bpo: 46962 .. date: 2022-03-08-22-10-38 .. nonce: FIVe9I .. section: Documentation

All docstrings in code snippets are now wrapped into :c:macro:PyDoc_STR to follow the guideline of :pep:PEP 7's Documentation Strings paragraph <0007#documentation-strings>. Patch by Oleg Iarygin.

.. bpo: 26792 .. date: 2022-01-23-20-44-53 .. nonce: dQ1v1W .. section: Documentation

Improve the docstrings of :func:runpy.run_module and :func:runpy.run_path. Original patch by Andrew Brezovsky.

.. date: 2022-05-02-20-57-04 .. gh-issue: 92169 .. nonce: Xi4NGV .. section: Tests

Use warnings_helper.import_deprecated() to import deprecated modules uniformly in tests. Patch by Hugo van Kemenade.

.. date: 2022-05-02-20-15-54 .. gh-issue: 84461 .. nonce: DhxllI .. section: Tests

When multiprocessing is enabled, libregrtest can now use a Python executable other than :code:sys.executable via the --python flag.

.. date: 2022-04-25-11-16-36 .. gh-issue: 91904 .. nonce: 13Uvrz .. section: Tests

Fix initialization of :envvar:PYTHONREGRTEST_UNICODE_GUARD which prevented running regression tests on non-UTF-8 locale.

.. date: 2022-04-22-19-00-00 .. gh-issue: 91752 .. nonce: Ji27dd .. section: Tests

Added @requires_zlib to test.test_tools.test_freeze.TestFreeze.

.. date: 2022-04-16-17-54-05 .. gh-issue: 91607 .. nonce: FnXjtW .. section: Tests

Fix test_concurrent_futures to test the correct multiprocessing start method context in several cases where the test logic mixed this up.

.. bpo: 40280 .. date: 2022-04-06-10-16-27 .. nonce: KT5Apg .. section: Tests

Threading tests are now skipped on WASM targets without pthread support.

.. bpo: 47109 .. date: 2022-03-24-13-35-01 .. nonce: FjKQCE .. section: Tests

Test for :mod:ctypes.macholib.dyld, :mod:ctypes.macholib.dylib, and :mod:ctypes.macholib.framework are brought from manual pre-:mod:unittest times to :mod:ctypes.test location and structure. Patch by Oleg Iarygin.

.. bpo: 29890 .. date: 2022-01-24-21-31-09 .. nonce: zEG-ra .. section: Tests

Add tests for :class:ipaddress.IPv4Interface and :class:ipaddress.IPv6Interface construction with tuple arguments. Original patch and tests by louisom.

.. date: 2022-05-03-03-36-47 .. gh-issue: 89452 .. nonce: NIY0fF .. section: Build

gdbm-compat is now preferred over ndbm if both are available on the system. This allows avoiding the problematic ndbm.h on macOS.

.. date: 2022-04-20-11-14-51 .. gh-issue: 91731 .. nonce: zRoPcJ .. section: Build

Python is now built with -std=c11 compiler option, rather than -std=c99. Patch by Victor Stinner.

.. bpo: 47152 .. date: 2022-04-10-16-33-31 .. nonce: TLkxKm .. section: Build

Add script and make target for generating sre_constants.h.

.. bpo: 47103 .. date: 2022-03-23-20-01-16 .. nonce: b4-00F .. section: Build

Windows PGInstrument builds now copy a required DLL into the output directory, making it easier to run the profile stage of a PGO build.

.. bpo: 46907 .. date: 2022-04-27-19-36-56 .. nonce: lfurlP .. section: Windows

Update Windows installer to use SQLite 3.38.3.

.. bpo: 47239 .. date: 2022-04-06-15-16-37 .. nonce: B1HP7i .. section: Windows

Fixed --list and --list-paths output for :ref:launcher when used in an active virtual environment.

.. bpo: 46907 .. date: 2022-03-28-07-01-31 .. nonce: Ou3G6Z .. section: Windows

Update Windows installer to use SQLite 3.38.2.

.. bpo: 46785 .. date: 2022-03-13-20-35-41 .. nonce: Pnknyl .. section: Windows

Fix race condition between :func:os.stat and unlinking a file on Windows, by using errors codes returned by FindFirstFileW() when appropriate in win32_xstat_impl.

.. bpo: 40859 .. date: 2020-06-04-10-42-04 .. nonce: isKSw7 .. section: Windows

Update Windows build to use xz-5.2.5

.. bpo: 46907 .. date: 2022-05-05-06-21-39 .. nonce: dkgFPk .. section: macOS

Update macOS installer to SQLite 3.38.4.

.. date: 2022-04-20-14-26-14 .. gh-issue: 91583 .. nonce: 200qI0 .. section: Tools/Demos

Fix regression in the code generated by Argument Clinic for functions with the defining_class parameter.

.. date: 2022-04-18-12-52-16 .. gh-issue: 91575 .. nonce: fK1TEh .. section: Tools/Demos

Add script Tools/scripts/generate_re_casefix.py and the make target regen-re for generating additional data for case-insensitive matching according to the current Unicode version.

.. date: 2022-04-14-18-11-46 .. gh-issue: 91551 .. nonce: l_nNT- .. section: Tools/Demos

Remove the ancient Pynche color editor. It has moved to https://gitlab.com/warsaw/pynche

.. date: 2022-05-06-04-55-17 .. gh-issue: 88279 .. nonce: 3mQ54t .. section: C API

Deprecate the C functions: :c:func:!PySys_SetArgv, :c:func:!PySys_SetArgvEx, :c:func:!PySys_SetPath. Patch by Victor Stinner.

.. date: 2022-05-03-20-08-35 .. gh-issue: 92154 .. nonce: IqMcAJ .. section: C API

Added the :c:func:PyCode_GetCode function. This function does the equivalent of the Python code getattr(code_object, 'co_code').

.. date: 2022-05-02-12-39-33 .. gh-issue: 92173 .. nonce: len2Is .. section: C API

Fix the closure argument to :c:func:PyEval_EvalCodeEx.

.. date: 2022-04-26-16-51-31 .. gh-issue: 91320 .. nonce: QDHmTv .. section: C API

Fix C++ compiler warnings about "old-style cast" (g++ -Wold-style-cast) in the Python C API. Use C++ reinterpret_cast<> and static_cast<> casts when the Python C API is used in C++. Patch by Victor Stinner.

.. date: 2022-04-21-23-11-35 .. gh-issue: 80527 .. nonce: Cx-95G .. section: C API

Mark functions as deprecated by :pep:623: :c:func:!PyUnicode_AS_DATA, :c:func:!PyUnicode_AS_UNICODE, :c:func:!PyUnicode_GET_DATA_SIZE, :c:func:!PyUnicode_GET_SIZE. Patch by Victor Stinner.

.. date: 2022-04-21-01-48-22 .. gh-issue: 91768 .. nonce: x_aKzv .. section: C API

:c:func:Py_REFCNT, :c:func:Py_TYPE, :c:func:Py_SIZE and :c:func:Py_IS_TYPE functions argument type is now PyObject*, rather than const PyObject*. Patch by Victor Stinner.

.. date: 2022-04-19-17-05-39 .. gh-issue: 91020 .. nonce: BVJ8F3 .. section: C API

Add PyBytes_Type.tp_alloc to initialize PyBytesObject.ob_shash for bytes subclasses.

.. bpo: 40421 .. date: 2022-04-08-11-29-36 .. nonce: H0ORmT .. section: C API

Add PyFrame_GetLasti C-API function to access frame object's f_lasti attribute safely from C code.

.. bpo: 35134 .. date: 2022-04-07-00-53-51 .. nonce: zSjIzk .. section: C API

Remove the Include/code.h header file. C extensions should only include the main <Python.h> header file. Patch by Victor Stinner.

.. bpo: 47169 .. date: 2022-04-06-16-54-39 .. nonce: EGzX4B .. section: C API

:c:func:PyOS_CheckStack is now exported in the Stable ABI on Windows.

.. bpo: 47169 .. date: 2022-04-06-16-29-14 .. nonce: wVv2bT .. section: C API

:c:func:PyThread_get_thread_native_id is excluded from the stable ABI on platforms where it doesn't exist (like Solaris).

.. bpo: 46343 .. date: 2022-01-11-12-52-37 .. nonce: JQJWhZ .. section: C API

Added :c:func:PyErr_GetHandledException and :c:func:PyErr_SetHandledException as simpler alternatives to :c:func:PyErr_GetExcInfo and :c:func:PyErr_SetExcInfo.

They are included in the stable ABI.