.. bpo: 46940
.. date: 2022-03-06-20-16-13
.. nonce: _X47Hx
.. release date: 2022-03-07
.. section: Core and Builtins

Avoid overriding :exc:`AttributeError` metadata information for nested
attribute access calls. Patch by Pablo Galindo.

..

.. bpo: 46927
.. date: 2022-03-05-12-23-58
.. nonce: URbHBi
.. section: Core and Builtins

Include the type's name in the error message for subscripting non-generic
types.

..

.. bpo: 46921
.. date: 2022-03-05-00-43-22
.. nonce: tyuPeB
.. section: Core and Builtins

Support vectorcall for ``super()``. Patch by Ken Jin.

..

.. bpo: 46841
.. date: 2022-03-03-14-31-53
.. nonce: agf-3X
.. section: Core and Builtins

Fix incorrect handling of inline cache entries when specializing
:opcode:`BINARY_OP`.

..

.. bpo: 46841
.. date: 2022-03-03-12-36-15
.. nonce: apPev2
.. section: Core and Builtins

Use an oparg to simplify the construction of helpful error messages in
:opcode:`GET_AWAITABLE`.

..

.. bpo: 46903
.. date: 2022-03-03-12-02-41
.. nonce: OzgaFZ
.. section: Core and Builtins

Make sure that str subclasses can be used as attribute names for instances
with virtual dictionaries. Fixes regression in 3.11alpha

..

.. bpo: 46841
.. date: 2022-03-03-10-46-13
.. nonce: 7CkuZx
.. section: Core and Builtins

Add more detailed specialization failure stats for :opcode:`COMPARE_OP`
followed by :opcode:`EXTENDED_ARG`.

..

.. bpo: 46891
.. date: 2022-03-02-15-04-08
.. nonce: aIAgTD
.. section: Core and Builtins

Fix bug introduced during 3.11alpha where subclasses of ``types.ModuleType``
with ``__slots__`` were not initialized correctly, resulting in an
interpreter crash.

..

.. bpo: 46841
.. date: 2022-03-01-17-47-58
.. nonce: inYQlU
.. section: Core and Builtins

Use inline caching for :opcode:`LOAD_ATTR`, :opcode:`LOAD_METHOD`, and
:opcode:`STORE_ATTR`.

..

.. bpo: 46841
.. date: 2022-02-28-15-46-36
.. nonce: MDQoty
.. section: Core and Builtins

Use inline cache for :opcode:`BINARY_SUBSCR`.

..

.. bpo: 46841
.. date: 2022-02-28-12-01-04
.. nonce: r60AMJ
.. section: Core and Builtins

Use inline caching for :opcode:`COMPARE_OP`.

..

.. bpo: 46864
.. date: 2022-02-26-19-26-36
.. nonce: EmLgFp
.. section: Core and Builtins

Deprecate ``PyBytesObject.ob_shash``. It will be removed in Python 3.13.

..

.. bpo: 46841
.. date: 2022-02-25-15-18-40
.. nonce: tmLpgC
.. section: Core and Builtins

Use inline caching for :opcode:`UNPACK_SEQUENCE`.

..

.. bpo: 46845
.. date: 2022-02-25-14-57-21
.. nonce: TUvaMG
.. section: Core and Builtins

Reduces dict size by removing hash value from hash table when all inserted
keys are Unicode. For example, ``sys.getsizeof(dict.fromkeys("abcdefg"))``
becomes 272 bytes from 352 bytes on 64bit platform.

..

.. bpo: 46841
.. date: 2022-02-25-13-18-18
.. nonce: 86QiQu
.. section: Core and Builtins

Use inline cache for :opcode:`LOAD_GLOBAL`.

..

.. bpo: 46852
.. date: 2022-02-25-02-01-42
.. nonce: _3zg8D
.. section: Core and Builtins

Rename the private undocumented ``float.__set_format__()`` method to
``float.__setformat__()`` to fix a typo introduced in Python 3.7. The method
is only used by test_float. Patch by Victor Stinner.

..

.. bpo: 46852
.. date: 2022-02-25-01-42-45
.. nonce: nkRDvV
.. section: Core and Builtins

Remove the undocumented private ``float.__set_format__()`` method,
previously known as ``float.__setformat__()`` in Python 3.7. Its docstring
said: "You probably don't want to use this function. It exists mainly to be
used in Python's test suite." Patch by Victor Stinner.

..

.. bpo: 40116
.. date: 2022-02-24-16-34-17
.. nonce: AeVGG2
.. section: Core and Builtins

Fix regression that dict.update(other) may don't respect iterate order of
other when other is key sharing dict.

..

.. bpo: 46712
.. date: 2022-02-24-07-50-43
.. nonce: pw7vQV
.. section: Core and Builtins

Share global string identifiers in deep-frozen modules.

..

.. bpo: 46430
.. date: 2022-02-24-07-33-29
.. nonce: c91TAg
.. section: Core and Builtins

Fix memory leak in interned strings of deep-frozen modules.

..

.. bpo: 46841
.. date: 2022-02-23-18-17-30
.. nonce: fns8HB
.. section: Core and Builtins

Store :opcode:`BINARY_OP` caches inline using a new :opcode:`CACHE`
instruction.

..

.. bpo: 45107
.. date: 2022-02-23-15-26-02
.. nonce: axcgHn
.. section: Core and Builtins

Specialize ``LOAD_METHOD`` for instances with a dict.

..

.. bpo: 44337
.. date: 2022-02-22-17-19-45
.. nonce: XA-egu
.. section: Core and Builtins

Reduce the memory usage of specialized :opcode:`LOAD_ATTR` and
:opcode:`STORE_ATTR` instructions.

..

.. bpo: 46729
.. date: 2022-02-22-17-18-36
.. nonce: ZwGTFq
.. section: Core and Builtins

Add number of sub-exceptions to :meth:`BaseException.__str__`.

..

.. bpo: 45885
.. date: 2022-02-22-15-48-32
.. nonce: W2vkaI
.. section: Core and Builtins

Don't un-adapt :opcode:`COMPARE_OP` when collecting specialization stats.

..

.. bpo: 46329
.. date: 2022-02-22-14-03-56
.. nonce: RX_AzJ
.. section: Core and Builtins

Fix specialization stats gathering for :opcode:`!PRECALL` instructions.

..

.. bpo: 46794
.. date: 2022-02-22-12-07-53
.. nonce: 6WvJ9o
.. section: Library

Bump up the libexpat version into 2.4.6

..

.. bpo: 46823
.. date: 2022-02-22-05-14-25
.. nonce: z9NZC9
.. section: Core and Builtins

Implement a specialized combined opcode
``LOAD_FAST__LOAD_ATTR_INSTANCE_VALUE``.  Patch by Dennis Sweeney.

..

.. bpo: 46820
.. date: 2022-02-21-21-55-23
.. nonce: 4RfUZh
.. section: Core and Builtins

Fix parsing a numeric literal immediately (without spaces) followed by "not
in" keywords, like in ``1not in x``. Now the parser only emits a warning,
not a syntax error.

..

.. bpo: 46329
.. date: 2022-02-21-10-29-20
.. nonce: cbkt7u
.. section: Core and Builtins

Move ``KW_NAMES`` before ``PRECALL`` instruction in call sequence. Change
``operand`` of ``CALL`` to match ``PRECALL`` for easier specialization.

..

.. bpo: 46808
.. date: 2022-02-20-23-10-14
.. nonce: vouNSF
.. section: Core and Builtins

Remove the ``NEXT_BLOCK`` macro from compile.c, and make the compiler
automatically generate implicit blocks when they are needed.

..

.. bpo: 46329
.. date: 2022-02-16-13-15-16
.. nonce: 8aIuz9
.. section: Core and Builtins

Add ``PUSH_NULL`` instruction. This is used as a prefix when evaluating a
callable, so that the stack has the same shape for methods and other calls.
``PRECALL_FUNCTION`` and ``PRECALL_METHOD`` are merged into a single
``PRECALL`` instruction.

There is no change in semantics.

..

.. bpo: 46762
.. date: 2022-02-15-20-26-46
.. nonce: 1H7vab
.. section: Core and Builtins

Fix an assert failure in debug builds when a '<', '>', or '=' is the last
character in an f-string that's missing a closing right brace.

..

.. bpo: 46730
.. date: 2022-02-14-21-04-43
.. nonce: rYJ1w5
.. section: Core and Builtins

Message of AttributeError caused by getting, setting or deleting a property
without the corresponding function now mentions that the attribute is in
fact a property and also specifies type of the class that it belongs to.

..

.. bpo: 46724
.. date: 2022-02-14-14-44-06
.. nonce: jym_K6
.. section: Core and Builtins

Make sure that all backwards jumps use the ``JUMP_ABSOLUTE`` instruction,
rather than ``JUMP_FORWARD`` with an argument of ``(2**32)+offset``.

..

.. bpo: 46732
.. date: 2022-02-12-11-16-40
.. nonce: 3Z_qxd
.. section: Core and Builtins

Correct the docstring for the :meth:`~object.__bool__` method. Patch by Jelle
Zijlstra.

..

.. bpo: 46072
.. date: 2022-02-11-13-47-58
.. nonce: PDS6Ke
.. section: Core and Builtins

Add more detailed specialization failure statistics for :opcode:`BINARY_OP`.

..

.. bpo: 46707
.. date: 2022-02-10-03-13-18
.. nonce: xeSEh0
.. section: Core and Builtins

Avoid potential exponential backtracking when producing some syntax errors
involving lots of brackets. Patch by Pablo Galindo.

..

.. bpo: 46323
.. date: 2022-02-10-02-29-12
.. nonce: HK_cs0
.. section: Library

:mod:`ctypes` now allocates memory on the stack instead of on the heap to
pass arguments while calling a Python callback function. Patch by Donghee
Na.

..

.. bpo: 45923
.. date: 2022-02-09-20-21-43
.. nonce: tJ4gDX
.. section: Core and Builtins

Add a quickened form of :opcode:`RESUME` that skips quickening checks.

..

.. bpo: 46702
.. date: 2022-02-09-16-36-11
.. nonce: LcaEuC
.. section: Core and Builtins

Specialize :opcode:`UNPACK_SEQUENCE` for :class:`tuple` and :class:`list`
unpackings.

..

.. bpo: 46072
.. date: 2022-02-07-14-38-54
.. nonce: 6ebLyN
.. section: Core and Builtins

Opcode pair stats are now gathered with ``--enable-pystats``. Defining
``DYNAMIC_EXECUTION_PROFILE`` or  ``DXPAIRS`` no longer has any effect.

..

.. bpo: 46675
.. date: 2022-02-07-14-33-45
.. nonce: ZPbdMp
.. section: Core and Builtins

Allow more than 16 items in a split dict before it is combined. The limit is
now 254.

..

.. bpo: 40479
.. date: 2022-02-06-23-08-30
.. nonce: zED3Zu
.. section: Library

Add a missing call to ``va_end()`` in ``Modules/_hashopenssl.c``.

..

.. bpo: 46323
.. date: 2022-02-05-14-46-21
.. nonce: FC1OJg
.. section: Library

Use :c:func:`PyObject_Vectorcall` while calling ctypes callback function.
Patch by Donghee Na.

..

.. bpo: 46615
.. date: 2022-02-04-04-33-18
.. nonce: puArY9
.. section: Core and Builtins

When iterating over sets internally in ``setobject.c``, acquire strong
references to the resulting items from the set.  This prevents crashes in
corner-cases of various set operations where the set gets mutated.

..

.. bpo: 45828
.. date: 2022-01-27-14-20-18
.. nonce: kzk4fl
.. section: Core and Builtins

The bytecode compiler now attempts to apply runtime stack manipulations at
compile-time (whenever it is feasible to do so).

..

.. bpo: 30496
.. date: 2022-01-09-11-59-04
.. nonce: KvuuGT
.. section: Core and Builtins

Fixed a minor portability issue in the implementation of
:c:func:`PyLong_FromLong`, and added a fast path for single-digit integers
to :c:func:`PyLong_FromLongLong`.

..

.. bpo: 25707
.. date: 2022-03-05-09-43-53
.. nonce: gTlclP
.. section: Library

Fixed a file leak in :func:`xml.etree.ElementTree.iterparse` when the
iterator is not exhausted. Patch by Jacob Walls.

..

.. bpo: 46877
.. date: 2022-03-03-06-58-52
.. nonce: BKgjpD
.. section: Library

Export :func:`unittest.doModuleCleanups` in :mod:`unittest`. Patch by Kumar
Aditya.

..

.. bpo: 46848
.. date: 2022-03-01-01-16-13
.. nonce: BB01Fr
.. section: Library

For performance, use the optimized string-searching implementations from
:meth:`~bytes.find` and :meth:`~bytes.rfind` for :meth:`~mmap.find` and
:meth:`~mmap.rfind`.

..

.. bpo: 46736
.. date: 2022-02-24-01-49-38
.. nonce: NJcoWO
.. section: Library

:class:`~http.server.SimpleHTTPRequestHandler` now uses HTML5 grammar. Patch
by Donghee Na.

..

.. bpo: 44886
.. date: 2022-02-23-00-55-59
.. nonce: I40Mbr
.. section: Library

Inherit asyncio proactor datagram transport from
:class:`asyncio.DatagramTransport`.

..

.. bpo: 46827
.. date: 2022-02-22-15-08-30
.. nonce: hvj38S
.. section: Library

Support UDP sockets in  :meth:`asyncio.loop.sock_connect` for selector-based
event loops.  Patch by Thomas Grainger.

..

.. bpo: 46811
.. date: 2022-02-20-21-03-31
.. nonce: 8BxgdQ
.. section: Library

Make test suite support Expat >=2.4.5

..

.. bpo: 46252
.. date: 2022-02-20-12-59-46
.. nonce: KG1SqA
.. section: Library

Raise :exc:`TypeError` if :class:`ssl.SSLSocket` is passed to
transport-based APIs.

..

.. bpo: 46784
.. date: 2022-02-18-22-10-30
.. nonce: SVOQJx
.. section: Library

Fix libexpat symbols collisions with user dynamically loaded or statically
linked libexpat in embedded Python.

..

.. bpo: 46786
.. date: 2022-02-18-12-10-26
.. nonce: P0xRvS
.. section: Library

The HTML serialisation in xml.etree.ElementTree now writes ``embed``,
``source``, ``track`` and ``wbr`` as empty tags, as defined in HTML 5.

..

.. bpo: 39327
.. date: 2022-02-17-13-10-50
.. nonce: ytIT7Z
.. section: Library

:func:`shutil.rmtree` can now work with VirtualBox shared  folders when
running from the guest operating-system.

..

.. bpo: 45390
.. date: 2022-02-17-11-00-16
.. nonce: sVhG6M
.. section: Library

Propagate :exc:`asyncio.CancelledError` message from inner task to outer
awaiter.

..

.. bpo: 46756
.. date: 2022-02-15-11-57-53
.. nonce: AigSPi
.. section: Library

Fix a bug in :meth:`urllib.request.HTTPPasswordMgr.find_user_password` and
:meth:`urllib.request.HTTPPasswordMgrWithPriorAuth.is_authenticated` which
allowed to bypass authorization. For example, access to URI
``example.org/foobar`` was allowed if the user was authorized for URI
``example.org/foo``.

..

.. bpo: 46737
.. date: 2022-02-15-07-39-43
.. nonce: 6Pnblt
.. section: Library

:func:`random.gauss` and :func:`random.normalvariate` now have default
arguments.

..

.. bpo: 46752
.. date: 2022-02-14-21-21-49
.. nonce: m6ldTm
.. section: Library

Add task groups to asyncio (structured concurrency, inspired by Trio's
nurseries). This also introduces a change to task cancellation, where a
cancelled task can't be cancelled again until it calls .uncancel().

..

.. bpo: 46724
.. date: 2022-02-11-20-41-17
.. nonce: eU52_N
.. section: Library

Fix :mod:`dis` behavior on negative jump offsets.

..

.. bpo: 46333
.. date: 2022-02-11-20-01-49
.. nonce: PMTBY9
.. section: Library

The :meth:`__repr__` method of :class:`typing.ForwardRef` now includes the
``module`` parameter of :class:`typing.ForwardRef` when it is set.

..

.. bpo: 46643
.. date: 2022-02-09-22-40-11
.. nonce: aBlIx1
.. section: Library

In :func:`typing.get_type_hints`, support evaluating stringified
``ParamSpecArgs`` and ``ParamSpecKwargs`` annotations. Patch by Gregory
Beauregard.

..

.. bpo: 45863
.. date: 2022-02-09-00-53-23
.. nonce: zqQXVv
.. section: Library

When the :mod:`tarfile` module creates a pax format archive, it will put an
integer representation of timestamps in the ustar header (if possible) for
the benefit of older unarchivers, in addition to the existing full-precision
timestamps in the pax extended header.

..

.. bpo: 46066
.. date: 2022-02-08-16-42-20
.. nonce: m32Hl0
.. section: Library

Deprecate kwargs-based syntax for :class:`typing.TypedDict` definitions. It
had confusing semantics when specifying totality, and was largely unused.
Patch by Jingchen Ye.

..

.. bpo: 46676
.. date: 2022-02-07-19-20-42
.. nonce: 3Aws1o
.. section: Library

Make :data:`typing.ParamSpec` args and kwargs equal to themselves. Patch by
Gregory Beauregard.

..

.. bpo: 46323
.. date: 2022-02-07-13-27-59
.. nonce: 7UENAj
.. section: Library

``ctypes.CFUNCTYPE()`` and ``ctypes.WINFUNCTYPE()`` now fail to create the
type if its ``_argtypes_`` member contains too many arguments. Previously,
the error was only raised when calling a function. Patch by Victor Stinner.

..

.. bpo: 46672
.. date: 2022-02-07-13-15-16
.. nonce: 4swIjx
.. section: Library

Fix ``NameError`` in :func:`asyncio.gather` when initial type check fails.

..

.. bpo: 46659
.. date: 2022-02-06-19-13-02
.. nonce: q-vNL9
.. section: Library

The :class:`calendar.LocaleTextCalendar` and
:class:`calendar.LocaleHTMLCalendar` classes now use
:func:`locale.getlocale`, instead of using :func:`locale.getdefaultlocale`,
if no locale is specified. Patch by Victor Stinner.

..

.. bpo: 46659
.. date: 2022-02-06-17-57-45
.. nonce: zTmkoQ
.. section: Library

The :func:`locale.getdefaultlocale` function is deprecated and will be
removed in Python 3.13. Use :func:`locale.setlocale`,
:func:`locale.getpreferredencoding(False) <locale.getpreferredencoding>` and
:func:`locale.getlocale` functions instead.  Patch by Victor Stinner.

..

.. bpo: 46655
.. date: 2022-02-06-08-54-03
.. nonce: DiLzYv
.. section: Library

In :func:`typing.get_type_hints`, support evaluating bare stringified
``TypeAlias`` annotations. Patch by Gregory Beauregard.

..

.. bpo: 45948
.. date: 2022-02-05-18-22-05
.. nonce: w4mCnE
.. section: Library

Fixed a discrepancy in the C implementation of the
:mod:`xml.etree.ElementTree` module. Now, instantiating an
:class:`xml.etree.ElementTree.XMLParser` with a ``target=None`` keyword
provides a default :class:`xml.etree.ElementTree.TreeBuilder` target as the
Python implementation does.

..

.. bpo: 46626
.. date: 2022-02-03-10-22-42
.. nonce: r2e-n_
.. section: Library

Expose Linux's ``IP_BIND_ADDRESS_NO_PORT`` option in :mod:`socket`.

..

.. bpo: 46521
.. date: 2022-02-01-19-34-28
.. nonce: IMUIrs
.. section: Library

Fix a bug in the :mod:`codeop` module that was incorrectly identifying
invalid code involving string quotes as valid code.

..

.. bpo: 46571
.. date: 2022-02-01-11-21-34
.. nonce: L40xUJ
.. section: Library

Improve :func:`typing.no_type_check`.

Now it does not modify external classes and functions. We also now correctly
mark classmethods as not to be type checked.

..

.. bpo: 46400
.. date: 2022-01-30-15-16-12
.. nonce: vweUiO
.. section: Library

expat: Update libexpat from 2.4.1 to 2.4.4

..

.. bpo: 46556
.. date: 2022-01-27-23-20-30
.. nonce: tlpAgS
.. section: Library

Deprecate undocumented support for using a :class:`pathlib.Path` object as a
context manager.

..

.. bpo: 46534
.. date: 2022-01-26-18-06-08
.. nonce: vhzUM4
.. section: Library

Implement :pep:`673` :class:`typing.Self`. Patch by James Hilton-Balfe.

..

.. bpo: 46522
.. date: 2022-01-25-15-31-04
.. nonce: tYAlX4
.. section: Library

Make various module ``__getattr__`` AttributeErrors more closely match a
typical AttributeError

..

.. bpo: 46475
.. date: 2022-01-23-15-35-07
.. nonce: UCe18S
.. section: Library

Add :data:`typing.Never` and :func:`typing.assert_never`. Patch by Jelle
Zijlstra.

..

.. bpo: 46333
.. date: 2022-01-11-15-54-15
.. nonce: B1faiF
.. section: Library

The :meth:`__eq__` and :meth:`__hash__` methods of
:class:`typing.ForwardRef` now honor the ``module`` parameter of
:class:`typing.ForwardRef`. Forward references from different modules are
now differentiated.

..

.. bpo: 46246
.. date: 2022-01-07-13-27-53
.. nonce: CTLx32
.. section: Library

Add missing ``__slots__`` to ``importlib.metadata.DeprecatedList``. Patch by
Arie Bovenberg.

..

.. bpo: 46232
.. date: 2022-01-03-09-46-44
.. nonce: s0KlyI
.. section: Library

The :mod:`ssl` module now handles certificates with bit strings in DN
correctly.

..

.. bpo: 46195
.. date: 2021-12-30-21-38-51
.. nonce: jFKGq_
.. section: Library

:func:`typing.get_type_hints` no longer adds ``Optional`` to parameters with
``None`` as a default. This aligns to changes to PEP 484 in
https://github.com/python/peps/pull/689

..

.. bpo: 31369
.. date: 2021-12-27-18-28-44
.. nonce: b9yM94
.. section: Library

Add :class:`~re.RegexFlag` to ``re.__all__`` and documented it. Add
:data:`~re.RegexFlag.NOFLAG` to indicate no flags being set.

..

.. bpo: 45898
.. date: 2021-11-26-10-46-09
.. nonce: UIfhsb
.. section: Library

:mod:`ctypes` no longer defines ``ffi_type_*`` symbols in ``cfield.c``. The
symbols have been provided by libffi for over a decade.

..

.. bpo: 44953
.. date: 2021-08-19-09-29-43
.. nonce: 27ZyUd
.. section: Library

Calling ``operator.itemgetter`` objects and ``operator.attrgetter`` objects
is now faster due to use of the vectorcall calling convention.

..

.. bpo: 44289
.. date: 2021-06-02-19-47-46
.. nonce: xC5kuV
.. section: Library

Fix an issue with :meth:`~tarfile.is_tarfile` method when using *fileobj*
argument: position in the *fileobj* was advanced forward which made it
unreadable with :meth:`tarfile.TarFile.open`.

..

.. bpo: 44011
.. date: 2021-05-02-23-44-21
.. nonce: hd8iUO
.. section: Library

Reimplement SSL/TLS support in asyncio, borrow the implementation from
uvloop library.

..

.. bpo: 41086
.. date: 2020-06-23-01-50-24
.. nonce: YnOvpS
.. section: Library

Make the :class:`configparser.ConfigParser` constructor raise
:exc:`TypeError` if the ``interpolation`` parameter is not of type
:class:`!configparser.Interpolation`

..

.. bpo: 29418
.. date: 2020-03-31-20-53-11
.. nonce: 8Qa9cQ
.. section: Library

Implement :func:`inspect.ismethodwrapper` and fix :func:`inspect.isroutine`
for cases where methodwrapper is given. Patch by Hakan Çelik.

..

.. bpo: 14156
.. date: 2019-05-07-14-25-45
.. nonce: 0FaHXE
.. section: Library

argparse.FileType now supports an argument of '-' in binary mode, returning
the .buffer attribute of sys.stdin/sys.stdout as appropriate. Modes
including 'x' and 'a' are treated equivalently to 'w' when argument is '-'.
Patch contributed by Josh Rosenberg

..

.. bpo: 42238
.. date: 2022-02-03-11-24-59
.. nonce: yJcMa8
.. section: Documentation

``Doc/tools/rstlint.py`` has moved to its own repository and is now packaged
on PyPI as ``sphinx-lint``.

..

.. bpo: 46913
.. date: 2022-03-03-17-36-24
.. nonce: vxETIE
.. section: Tests

Fix test_faulthandler.test_sigfpe() if Python is built with undefined
behavior sanitizer (UBSAN): disable UBSAN on the faulthandler_sigfpe()
function. Patch by Victor Stinner.

..

.. bpo: 46760
.. date: 2022-02-16-10-38-18
.. nonce: O3ovJo
.. section: Tests

Remove bytecode offsets from expected values in test.test_dis module.
Reduces the obstacles to modifying the VM or compiler.

..

.. bpo: 46708
.. date: 2022-02-10-14-33-47
.. nonce: avLfCb
.. section: Tests

Prevent default asyncio event loop policy modification warning after
``test_asyncio`` execution.

..

.. bpo: 46678
.. date: 2022-02-07-12-40-45
.. nonce: zfOrgL
.. section: Tests

The function ``make_legacy_pyc`` in ``Lib/test/support/import_helper.py`` no
longer fails when ``PYTHONPYCACHEPREFIX`` is set to a directory on a
different device from where tempfiles are stored.

..

.. bpo: 46623
.. date: 2022-02-03-09-45-26
.. nonce: vxzuhV
.. section: Tests

Skip test_pair() and test_speech128() of test_zlib on s390x since they fail
if zlib uses the s390x hardware accelerator. Patch by Victor Stinner.

..

.. bpo: 46860
.. date: 2022-02-25-16-19-40
.. nonce: jfciLG
.. section: Build

Respect ``--with-suffix`` when building on case-insensitive file systems.

..

.. bpo: 46656
.. date: 2022-02-25-00-51-16
.. nonce: MD783M
.. section: Build

Building Python now requires a C11 compiler. Optional C11 features are not
required.
Patch by Victor Stinner.

..

.. bpo: 46656
.. date: 2022-02-06-14-04-20
.. nonce: ajJjkh
.. section: Build

Building Python now requires support for floating-point Not-a-Number (NaN):
remove the ``Py_NO_NAN`` macro. Patch by Victor Stinner.

..

.. bpo: 46640
.. date: 2022-02-04-21-26-50
.. nonce: HXUmQp
.. section: Build

Building Python now requires a C99 ``<math.h>`` header file providing a
``NAN`` constant, or the ``__builtin_nan()`` built-in function. Patch by
Victor Stinner.

..

.. bpo: 46608
.. date: 2022-02-02-11-26-46
.. nonce: cXH9po
.. section: Build

Exclude marshalled-frozen data if deep-freezing to save 300 KB disk space.
This includes adding a new ``is_package`` field to :c:struct:`_frozen`.
Patch by Kumar Aditya.

..

.. bpo: 40280
.. date: 2022-01-31-15-15-08
.. nonce: r1AYNW
.. section: Build

Fix wasm32-emscripten test failures and platform issues. - Disable syscalls
that are not supported or don't work, e.g.   wait, getrusage, prlimit,
mkfifo, mknod, setres[gu]id, setgroups. - Use fd_count to count open fds. -
Add more checks for subprocess and fork. - Add workarounds for missing
_multiprocessing and failing socket.accept(). - Enable bzip2. - Disable
large file support. - Disable signal.alarm.

..

.. bpo: 46430
.. date: 2022-01-19-11-08-32
.. nonce: k403m_
.. section: Build

Intern strings in deep-frozen modules. Patch by Kumar Aditya.

..

.. bpo: 46744
.. date: 2022-03-04-00-24-55
.. nonce: tneWFr
.. section: Windows

The default all users install directory for ARM64 is now under the native
``Program Files`` folder, rather than ``Program Files (Arm)`` which is
intended for ARM (32-bit) files.

..

.. bpo: 46567
.. date: 2022-02-25-01-22-31
.. nonce: 37WEue
.. section: Windows

Adds Tcl and Tk support for Windows ARM64. This also adds IDLE to the
installation.

..

.. bpo: 46638
.. date: 2022-02-04-18-02-33
.. nonce: mSJOSX
.. section: Windows

Ensures registry virtualization is consistently disabled. For 3.10 and
earlier, it remains enabled (some registry writes are protected), while for
3.11 and later it is disabled (registry modifications affect all
applications).

..

.. bpo: 46630
.. date: 2022-02-03-15-47-53
.. nonce: tREOjo
.. section: IDLE

Make query dialogs on Windows start with a cursor in the entry box.

..

.. bpo: 45447
.. date: 2021-10-14-16-55-03
.. nonce: FhiH5P
.. section: IDLE

Apply IDLE syntax highlighting to ``.pyi`` files. Patch by Alex Waygood and
Terry Jan Reedy.

..

.. bpo: 46748
.. date: 2022-02-24-13-13-16
.. nonce: aG1zb3
.. section: C API

Python's public headers no longer import ``<stdbool.h>``, leaving code that
embeds/extends Python free to define ``bool``, ``true`` and ``false``.

..

.. bpo: 46836
.. date: 2022-02-23-16-13-17
.. nonce: ZYyPF_
.. section: C API

Move the :c:type:`PyFrameObject` type definition (``struct _frame``) to the
internal C API ``pycore_frame.h`` header file. Patch by Victor Stinner.

..

.. bpo: 45459
.. date: 2022-02-07-18-47-00
.. nonce: 0FCWM8
.. section: C API

Rename ``Include/buffer.h`` header file to ``Include/pybuffer.h`` to avoid
conflicts with projects having an existing ``buffer.h`` header file. Patch by
Victor Stinner.

..

.. bpo: 45412
.. date: 2022-02-06-20-14-21
.. nonce: XJVaGW
.. section: C API

Remove the ``HAVE_PY_SET_53BIT_PRECISION`` macro (moved to the internal C
API). Patch by Victor Stinner.

..

.. bpo: 46613
.. date: 2022-02-02-17-58-49
.. nonce: __ZdpH
.. section: C API

Added function :c:func:`PyType_GetModuleByDef`, which allows access to
module state when a method's defining class is not available.
