3.12.0a4 - Cpython — ContextQMD

.. date: 2023-01-06-02-02-11 .. gh-issue: 100776 .. nonce: pP8xux .. release date: 2023-01-10 .. section: Core and Builtins

Fix misleading default value in :func:input's __text_signature__.

.. date: 2023-01-05-17-54-29 .. gh-issue: 99005 .. nonce: cmGwxv .. section: Core and Builtins

Remove :opcode:!UNARY_POSITIVE, :opcode:!ASYNC_GEN_WRAP and :opcode:!LIST_TO_TUPLE, replacing them with intrinsics.

.. date: 2023-01-05-13-54-00 .. gh-issue: 99005 .. nonce: D7H6j4 .. section: Core and Builtins

Add new :opcode:CALL_INTRINSIC_1 instruction. Remove :opcode:IMPORT_STAR, :opcode:PRINT_EXPR and :opcode:STOPITERATION_ERROR, replacing them with the :opcode:CALL_INTRINSIC_1 instruction.

.. date: 2023-01-04-16-40-55 .. gh-issue: 100288 .. nonce: hRSRaT .. section: Core and Builtins

Remove the LOAD_ATTR_METHOD_WITH_DICT specialized instruction. Stats show it is not useful.

.. date: 2023-01-03-16-50-42 .. gh-issue: 100720 .. nonce: UhE7P- .. section: Core and Builtins

Added _PyFrame_NumSlotsForCodeObject, which returns the number of slots needed in a frame for a given code object.

.. date: 2023-01-03-16-38-18 .. gh-issue: 100719 .. nonce: 2C--ko .. section: Core and Builtins

Removed the co_nplaincellvars field from the code object, as it is redundant.

.. date: 2023-01-01-15-59-48 .. gh-issue: 100637 .. nonce: M2n6Kg .. section: Core and Builtins

Fix :func:int.__sizeof__ calculation to include the 1-element ob_digit array for 0 and False.

.. date: 2022-12-31-23-32-09 .. gh-issue: 100649 .. nonce: C0fY4S .. section: Core and Builtins

Update the native_thread_id field of PyThreadState after fork.

.. date: 2022-12-29-04-39-38 .. gh-issue: 100126 .. nonce: pfFJd- .. section: Core and Builtins

Fix an issue where "incomplete" frames could be briefly visible to C code while other frames are being torn down, possibly resulting in corruption or hard crashes of the interpreter while running finalizers.

.. date: 2022-12-28-15-02-53 .. gh-issue: 87447 .. nonce: 7-aekA .. section: Core and Builtins

Fix :exc:SyntaxError on comprehension rebind checking with names that are not actually redefined.

Now reassigning b in [(b := 1) for a, b.prop in some_iter] is allowed. Reassigning a is still disallowed as per :pep:572.

.. date: 2022-12-22-21-56-08 .. gh-issue: 100268 .. nonce: xw_phB .. section: Core and Builtins

Add :meth:int.is_integer to improve duck type compatibility between :class:int and :class:float.

.. date: 2022-12-21-22-48-41 .. gh-issue: 100425 .. nonce: U64yLu .. section: Core and Builtins

Improve the accuracy of sum() with compensated summation.

.. date: 2022-12-20-16-14-19 .. gh-issue: 100374 .. nonce: YRrVHT .. section: Library

Fix incorrect result and delay in :func:socket.getfqdn. Patch by Dominic Socular.

.. date: 2022-12-20-09-56-56 .. gh-issue: 100357 .. nonce: hPyTwY .. section: Core and Builtins

Convert vars, dir, next, getattr, and iter to argument clinic.

.. date: 2022-12-17-19-44-57 .. gh-issue: 100117 .. nonce: yRWQ1y .. section: Core and Builtins

Improve the output of :meth:codeobject.co_lines by emitting only one entry for each line range.

.. date: 2022-12-15-00-50-25 .. gh-issue: 90043 .. nonce: gyoKdx .. section: Core and Builtins

Handle NaNs when specializing :opcode:COMPARE_OP for :class:float values.

.. date: 2022-12-13-16-05-18 .. gh-issue: 100222 .. nonce: OVVvYe .. section: Core and Builtins

Redefine the _Py_CODEUNIT typedef as a union to describe its layout to the C compiler, avoiding type punning and improving clarity.

.. date: 2022-12-12-11-27-54 .. gh-issue: 99955 .. nonce: Ix5Rrg .. section: Core and Builtins

Internal compiler functions (in compile.c) now consistently return -1 on error and 0 on success.

.. date: 2022-12-12-05-30-12 .. gh-issue: 100188 .. nonce: sGCSMR .. section: Core and Builtins

The BINARY_SUBSCR_LIST_INT and BINARY_SUBSCR_TUPLE_INT instructions are no longer used for negative integers because those instructions always miss when encountering negative integers.

.. date: 2022-12-12-01-05-16 .. gh-issue: 99110 .. nonce: 1JqtIg .. section: Core and Builtins

Initialize frame->previous in frameobject.c to fix a segmentation fault when accessing frames created by :c:func:PyFrame_New.

.. date: 2022-12-12-00-59-11 .. gh-issue: 94155 .. nonce: LWE9y_ .. section: Core and Builtins

Improved the hashing algorithm for code objects, mitigating some hash collisions.

.. date: 2022-12-10-20-00-13 .. gh-issue: 99540 .. nonce: ZZZHeP .. section: Core and Builtins

None now hashes to a constant value. This is not a requirements change.

.. date: 2022-12-09-14-27-36 .. gh-issue: 100143 .. nonce: 5g9rb4 .. section: Core and Builtins

When built with --enable-pystats, stats collection is now off by default. To enable it early at startup, pass the -Xpystats flag. Stats are now always dumped, even if switched off.

.. date: 2022-12-09-13-18-42 .. gh-issue: 100146 .. nonce: xLVKg0 .. section: Core and Builtins

Improve BUILD_LIST opcode so that it works similarly to the BUILD_TUPLE opcode, by stealing references from the stack rather than repeatedly using stack operations to set list elements. Implementation details are in a new private API :c:func:!_PyList_FromArraySteal.

.. date: 2022-12-08-12-26-34 .. gh-issue: 100110 .. nonce: ertac- .. section: Core and Builtins

Specialize FOR_ITER for tuples.

.. date: 2022-12-06-22-24-01 .. gh-issue: 100050 .. nonce: lcrPqQ .. section: Core and Builtins

Honor existing errors obtained when searching for mismatching parentheses in the tokenizer. Patch by Pablo Galindo

.. date: 2022-12-04-00-38-33 .. gh-issue: 92216 .. nonce: CJXuWB .. section: Core and Builtins

Improve the performance of :func:hasattr for type objects with a missing attribute.

.. date: 2022-11-19-01-11-06 .. gh-issue: 99582 .. nonce: wvOBVy .. section: Core and Builtins

Freeze :mod:zipimport module into _bootstrap_python.

.. date: 2022-11-16-05-57-24 .. gh-issue: 99554 .. nonce: A_Ywd2 .. section: Core and Builtins

Pack debugging location tables more efficiently during bytecode compilation.

.. date: 2022-10-21-16-10-39 .. gh-issue: 98522 .. nonce: s_SixG .. section: Core and Builtins

Add an internal version number to code objects, to give better versioning of inner functions and comprehensions, and thus better specialization of those functions. This change is invisible to both Python and C extensions.

.. date: 2022-07-06-18-44-00 .. gh-issue: 94603 .. nonce: Q_03xV .. section: Core and Builtins

Improve performance of list.pop for small lists.

.. date: 2022-06-17-08-00-34 .. gh-issue: 89051 .. nonce: yP4Na0 .. section: Library

Add :const:ssl.OP_LEGACY_SERVER_CONNECT

.. bpo: 32782 .. date: 2018-02-06-23-21-13 .. nonce: EJVSfR .. section: Core and Builtins

ctypes arrays of length 0 now report a correct itemsize when a memoryview is constructed from them, rather than always giving a value of 0.

.. date: 2023-01-08-12-10-17 .. gh-issue: 100833 .. nonce: f6cT7E .. section: Library

Speed up :func:math.fsum by removing defensive volatile qualifiers.

.. date: 2023-01-07-15-13-47 .. gh-issue: 100805 .. nonce: 05rBz9 .. section: Library

Modify :func:random.choice implementation to once again work with NumPy arrays.

.. date: 2023-01-06-22-36-27 .. gh-issue: 100813 .. nonce: mHRdQn .. section: Library

Add :const:socket.IP_PKTINFO constant.

.. date: 2023-01-06-14-05-15 .. gh-issue: 100792 .. nonce: CEOJth .. section: Library

Make :meth:email.message.Message.__contains__ twice as fast.

.. date: 2023-01-05-23-04-15 .. gh-issue: 91851 .. nonce: AuCzU5 .. section: Library

Microoptimizations for :meth:fractions.Fraction.__round__, :meth:fractions.Fraction.__ceil__ and :meth:fractions.Fraction.__floor__.

.. date: 2023-01-04-22-10-31 .. gh-issue: 90104 .. nonce: yZk5EX .. section: Library

Avoid RecursionError on repr if a dataclass field definition has a cyclic reference.

.. date: 2023-01-04-12-58-59 .. gh-issue: 100689 .. nonce: Ce0ITG .. section: Library

Fix crash in :mod:pyexpat by statically allocating PyExpat_CAPI capsule.

.. date: 2023-01-04-09-53-38 .. gh-issue: 100740 .. nonce: -j5UjI .. section: Library

Fix unittest.mock.Mock not respecting the spec for attribute names prefixed with assert.

.. date: 2023-01-03-11-06-28 .. gh-issue: 91219 .. nonce: s5IFCw .. section: Library

Change SimpleHTTPRequestHandler to support subclassing to provide a different set of index file names instead of using __init__ parameters.

.. date: 2023-01-02-16-59-49 .. gh-issue: 100690 .. nonce: 2EgWPS .. section: Library

Mock objects which are not unsafe will now raise an AttributeError when accessing an attribute that matches the name of an assertion but without the prefix assert_, e.g. accessing called_once instead of assert_called_once. This is in addition to this already happening for accessing attributes with prefixes assert, assret, asert, aseert, and assrt.

.. date: 2023-01-01-23-57-00 .. gh-issue: 89727 .. nonce: ojedHN .. section: Library

Simplify and optimize :func:os.walk by using :func:isinstance checks to check the top of the stack.

.. date: 2023-01-01-21-54-46 .. gh-issue: 100485 .. nonce: geNrHS .. section: Library

Add math.sumprod() to compute the sum of products.

.. date: 2022-12-30-07-49-08 .. gh-issue: 86508 .. nonce: nGZDzC .. section: Library

Fix :func:asyncio.open_connection to skip binding to local addresses of different family. Patch by Kumar Aditya.

.. date: 2022-12-29-11-45-22 .. gh-issue: 97930 .. nonce: hrtmJe .. section: Library

importlib.resources.files now accepts a module as an anchor instead of only accepting packages. If a module is passed, resources are resolved adjacent to that module (in the same package or at the package root). The parameter was renamed from package to anchor with a compatibility shim for those passing by keyword. Additionally, the new anchor parameter is now optional and will default to the caller's module.

.. date: 2022-12-28-17-38-39 .. gh-issue: 100585 .. nonce: BiiTlG .. section: Library

Fixed a bug where importlib.resources.as_file was leaving file pointers open

.. date: 2022-12-28-00-28-43 .. gh-issue: 100562 .. nonce: Hic0Z0 .. section: Library

Improve performance of :meth:pathlib.Path.absolute by nearly 2x. This comes at the cost of a performance regression in :meth:pathlib.Path.cwd, which is generally used less frequently in user code.

.. date: 2022-12-24-16-39-53 .. gh-issue: 100519 .. nonce: G_dZLP .. section: Library

Small simplification of :func:http.cookiejar.eff_request_host that improves readability and better matches the RFC wording.

.. date: 2022-12-24-08-42-05 .. gh-issue: 100287 .. nonce: n0oEuG .. section: Library

Fix the interaction of :func:unittest.mock.seal with :class:unittest.mock.AsyncMock.

.. date: 2022-12-24-04-13-54 .. gh-issue: 100488 .. nonce: Ut8HbE .. section: Library

Add :meth:Fraction.is_integer to check whether a :class:fractions.Fraction is an integer. This improves duck type compatibility with :class:float and :class:int.

.. date: 2022-12-23-21-02-43 .. gh-issue: 100474 .. nonce: gppA4U .. section: Library

:mod:http.server now checks that an index page is actually a regular file before trying to serve it. This avoids issues with directories named index.html.

.. date: 2022-12-20-11-07-30 .. gh-issue: 100363 .. nonce: Wo_Beg .. section: Library

Speed up :func:asyncio.get_running_loop by removing redundant getpid checks. Patch by Kumar Aditya.

.. date: 2022-12-19-20-54-04 .. gh-issue: 78878 .. nonce: JrkYqJ .. section: Library

Fix crash when creating an instance of :class:!_ctypes.CField.

.. date: 2022-12-19-19-30-06 .. gh-issue: 100348 .. nonce: o7IAHh .. section: Library

Fix ref cycle in :class:!asyncio._SelectorSocketTransport by removing _read_ready_cb in close.

.. date: 2022-12-19-12-18-28 .. gh-issue: 100344 .. nonce: lfCqpE .. section: Library

Provide C implementation for :func:asyncio.current_task for a 4x-6x speedup.

.. date: 2022-12-15-18-28-13 .. gh-issue: 100272 .. nonce: D1O9Ey .. section: Library

Fix JSON serialization of OrderedDict. It now preserves the order of keys.

.. date: 2022-12-14-17-37-01 .. gh-issue: 83076 .. nonce: NaYzWT .. section: Library

Instantiation of Mock() and AsyncMock() is now 3.8x faster.

.. date: 2022-12-14-11-45-38 .. gh-issue: 100234 .. nonce: kn6yWV .. section: Library

Set a default value of 1.0 for the lambd parameter in random.expovariate().

.. date: 2022-12-13-17-29-09 .. gh-issue: 100228 .. nonce: bgtzMV .. section: Library

A :exc:DeprecationWarning may be raised when :func:os.fork or :func:os.forkpty is called from multi-threaded processes. Forking with threads is unsafe and can cause deadlocks, crashes and subtle problems. Lack of a warning does not indicate that the fork call was actually safe, as Python may not be aware of all threads.

.. date: 2022-12-10-20-52-28 .. gh-issue: 100039 .. nonce: zDqjT4 .. section: Library

Improve signatures for enums and flags.

.. date: 2022-12-10-08-36-07 .. gh-issue: 100133 .. nonce: g-zQlp .. section: Library

Fix regression in :mod:asyncio where a subprocess would sometimes lose data received from pipe.

.. bpo: 44592 .. date: 2022-12-09-10-35-36 .. nonce: z-P3oe .. section: Library

Fixes inconsistent handling of case sensitivity of extrasaction arg in :class:csv.DictWriter.

.. date: 2022-12-08-06-18-06 .. gh-issue: 100098 .. nonce: uBvPlp .. section: Library

Fix tuple subclasses being cast to tuple when used as enum values.

.. date: 2022-12-04-16-12-04 .. gh-issue: 85432 .. nonce: l_ehmI .. section: Library

Rename the fmt parameter of the pure-Python implementation of :meth:datetime.time.strftime to format. Rename the t parameter of :meth:datetime.datetime.fromtimestamp to timestamp. These changes mean the parameter names in the pure-Python implementation now match the parameter names in the C implementation. Patch by Alex Waygood.

.. date: 2022-12-03-20-06-16 .. gh-issue: 98778 .. nonce: t5U9uc .. section: Library

Update :exc:~urllib.error.HTTPError to be initialized properly, even if the fp is None. Patch by Donghee Na.

.. date: 2022-12-01-15-44-58 .. gh-issue: 99925 .. nonce: x4y6pF .. section: Library

Unify error messages in JSON serialization between json.dumps(float('nan'), allow_nan=False) and json.dumps(float('nan'), allow_nan=False, indent=<SOMETHING>). Now both include the representation of the value that could not be serialized.

.. date: 2022-11-29-20-44-54 .. gh-issue: 89727 .. nonce: UJZjkk .. section: Library

Fix issue with :func:os.walk where a :exc:RecursionError would occur on deep directory structures by adjusting the implementation of :func:os.walk to be iterative instead of recursive.

.. date: 2022-11-23-23-58-45 .. gh-issue: 94943 .. nonce: Oog0Zo .. section: Library

Add :ref:enum-dataclass-support to the :class:~enum.Enum :meth:~enum.Enum.__repr__. When inheriting from a :class:~dataclasses.dataclass, only show the field names in the value section of the member :func:repr, and not the dataclass' class name.

.. date: 2022-11-21-16-24-01 .. gh-issue: 83035 .. nonce: qZIujU .. section: Library

Fix :func:inspect.getsource handling of decorator calls with nested parentheses.

.. date: 2022-11-20-11-59-54 .. gh-issue: 99576 .. nonce: ZD7jU6 .. section: Library

Fix .save() method for LWPCookieJar and MozillaCookieJar: saved file was not truncated on repeated save.

.. date: 2022-11-17-10-02-18 .. gh-issue: 94912 .. nonce: G2aa-E .. section: Library

Add :func:inspect.markcoroutinefunction decorator which manually marks a function as a coroutine for the benefit of :func:iscoroutinefunction.

.. date: 2022-11-15-18-45-01 .. gh-issue: 99509 .. nonce: FLK0xU .. section: Library

Add :pep:585 support for :class:multiprocessing.queues.Queue.

.. date: 2022-11-14-19-58-36 .. gh-issue: 99482 .. nonce: XmZyUr .. section: Library

Remove Jython partial compatibility code from several stdlib modules.

.. date: 2022-11-13-15-32-19 .. gh-issue: 99433 .. nonce: Ys6y0A .. section: Library

Fix :mod:doctest failure on :class:types.MethodWrapperType in modules.

.. date: 2022-10-28-07-24-34 .. gh-issue: 85267 .. nonce: xUy_Wm .. section: Library

Several improvements to :func:inspect.signature's handling of __text_signature. - Fixes a case where :func:inspect.signature dropped parameters - Fixes a case where :func:inspect.signature raised :exc:tokenize.TokenError - Allows :func:inspect.signature to understand defaults involving binary operations of constants - :func:inspect.signature is documented as only raising :exc:TypeError or :exc:ValueError, but sometimes raised :exc:RuntimeError. These cases now raise :exc:ValueError - Removed a dead code path

.. date: 2022-10-24-07-31-11 .. gh-issue: 91166 .. nonce: -IG06R .. section: Library

:mod:asyncio is optimized to avoid excessive copying when writing to socket and use :meth:~socket.socket.sendmsg if the platform supports it. Patch by Kumar Aditya.

.. date: 2022-10-07-18-16-00 .. gh-issue: 98030 .. nonce: 2oQCZy .. section: Library

Add missing TCP socket options from Linux: TCP_MD5SIG, TCP_THIN_LINEAR_TIMEOUTS, TCP_THIN_DUPACK, TCP_REPAIR, TCP_REPAIR_QUEUE, TCP_QUEUE_SEQ, TCP_REPAIR_OPTIONS, TCP_TIMESTAMP, TCP_CC_INFO, TCP_SAVE_SYN, TCP_SAVED_SYN, TCP_REPAIR_WINDOW, TCP_FASTOPEN_CONNECT, TCP_ULP, TCP_MD5SIG_EXT, TCP_FASTOPEN_KEY, TCP_FASTOPEN_NO_COOKIE, TCP_ZEROCOPY_RECEIVE, TCP_INQ, TCP_TX_DELAY.

.. date: 2022-09-16-08-21-46 .. gh-issue: 88500 .. nonce: jQ0pCc .. section: Library

Reduced the memory usage of :func:urllib.parse.unquote and :func:urllib.parse.unquote_to_bytes on large values.

.. date: 2022-08-27-10-35-50 .. gh-issue: 96127 .. nonce: 8RdLre .. section: Library

inspect.signature was raising TypeError on call with mock objects. Now it correctly returns (*args, **kwargs) as inferred signature.

.. date: 2022-08-11-10-02-19 .. gh-issue: 95882 .. nonce: FsUr72 .. section: Library

Fix a 3.11 regression in :func:~contextlib.asynccontextmanager, which caused it to propagate exceptions with incorrect tracebacks and fix a 3.11 regression in :func:~contextlib.contextmanager, which caused it to propagate exceptions with incorrect tracebacks for :exc:StopIteration.

.. date: 2022-07-01-00-01-22 .. gh-issue: 78707 .. nonce: fHGSuM .. section: Library

Deprecate passing more than one positional argument to :meth:pathlib.PurePath.relative_to and :meth:~pathlib.PurePath.is_relative_to.

.. date: 2022-05-06-01-53-34 .. gh-issue: 92122 .. nonce: 96Lf2p .. section: Library

Fix reStructuredText syntax errors in docstrings in the :mod:enum module.

.. date: 2022-04-23-08-12-14 .. gh-issue: 91851 .. nonce: Jd47V6 .. section: Library

Optimize the :class:~fractions.Fraction arithmetics for small components.

.. bpo: 24132 .. date: 2022-03-05-02-14-09 .. nonce: W6iORO .. section: Library

Make :class:pathlib.PurePath and :class:~pathlib.Path subclassable (private to start). Previously, attempting to instantiate a subclass resulted in an :exc:AttributeError being raised. Patch by Barney Gale.

.. bpo: 40447 .. date: 2020-05-03-12-55-55 .. nonce: oKR0Lj .. section: Library

Accept :class:os.PathLike (such as :class:pathlib.Path) in the stripdir arguments of :meth:compileall.compile_file and :meth:compileall.compile_dir.

.. bpo: 36880 .. date: 2019-05-13-11-37-30 .. nonce: ZgBgH0 .. section: Library

Fix a reference counting issue when a :mod:ctypes callback with return type :class:~ctypes.py_object returns None, which could cause crashes.

.. date: 2022-12-30-00-42-23 .. gh-issue: 100616 .. nonce: eu80ij .. section: Documentation

Document existing attr parameter to :func:curses.window.vline function in :mod:curses.

.. date: 2022-12-23-21-42-26 .. gh-issue: 100472 .. nonce: NNixfO .. section: Documentation

Remove claim in documentation that the stripdir, prependdir and limit_sl_dest parameters of :func:compileall.compile_dir and :func:compileall.compile_file could be :class:bytes.

.. bpo: 25377 .. date: 2020-06-17-14-47-48 .. nonce: CTxC6o .. section: Documentation

Clarify use of octal format of mode argument in help(os.chmod) as well as help(os.fchmod)

.. date: 2022-12-23-13-29-55 .. gh-issue: 100454 .. nonce: 3no0cW .. section: Tests

Start running SSL tests with OpenSSL 3.1.0-beta1.

.. date: 2022-12-08-00-03-37 .. gh-issue: 100086 .. nonce: 1zYpto .. section: Tests

The Python test runner (libregrtest) now logs Python build information like "debug" vs "release" build, or LTO and PGO optimizations. Patch by Victor Stinner.

.. date: 2022-06-16-13-26-31 .. gh-issue: 93018 .. nonce: wvNx76 .. section: Tests

Make two tests forgiving towards host system libexpat with backported security fixes applied.

.. date: 2022-12-26-15-07-48 .. gh-issue: 100540 .. nonce: l6ToSY .. section: Build

Removed the --with-system-ffi configure option; libffi must now always be supplied by the system on all non-Windows platforms. The option has had no effect on non-Darwin platforms for several releases, and in 3.11 only had the non-obvious effect of invoking pkg-config to find libffi and never setting -DUSING_APPLE_OS_LIBFFI. Now on Darwin platforms configure will first check for the OS libffi and then fall back to the same processing as other platforms if it is not found.

.. date: 2022-12-08-14-00-04 .. gh-issue: 88267 .. nonce: MqtRbm .. section: Build

Avoid exporting Python symbols in linked Windows applications when the core is built as static.

.. bpo: 41916 .. date: 2022-03-04-10-47-23 .. nonce: 1d2GLU .. section: Build

Allow override of ac_cv_cxx_thread so that cross compiled python can set -pthread for CXX.

.. date: 2023-01-09-23-03-57 .. gh-issue: 100180 .. nonce: b5phrg .. section: Windows

Update Windows installer to OpenSSL 1.1.1s

.. date: 2022-12-20-18-36-17 .. gh-issue: 99191 .. nonce: 0cfRja .. section: Windows

Use _MSVC_LANG >= 202002L instead of less-precise _MSC_VER >=1929 to more accurately test for C++20 support in :file:PC/_wmimodule.cpp.

.. date: 2022-12-09-22-47-42 .. gh-issue: 79218 .. nonce: Yiot2e .. section: Windows

Define MS_WIN64 for Mingw-w64 64bit, fix cython compilation failure.

.. date: 2022-12-06-11-16-46 .. gh-issue: 99941 .. nonce: GmUQ6o .. section: Windows

Ensure that :func:asyncio.Protocol.data_received receives an immutable :class:bytes object (as documented), instead of :class:bytearray.

.. bpo: 43984 .. date: 2021-05-02-15-29-33 .. nonce: U92jiv .. section: Windows

:meth:winreg.SetValueEx now leaves the target value untouched in the case of conversion errors. Previously, -1 would be written in case of such errors.

.. bpo: 34816 .. date: 2021-04-08-00-36-37 .. nonce: 4Xe0id .. section: Windows

hasattr(ctypes.windll, 'nonexistant') now returns False instead of raising :exc:OSError.

.. date: 2023-01-09-22-04-21 .. gh-issue: 100180 .. nonce: WVhCny .. section: macOS

Update macOS installer to OpenSSL 1.1.1s

.. date: 2022-12-26-14-52-37 .. gh-issue: 100540 .. nonce: kYZLtX .. section: macOS

Removed obsolete dlfcn.h shim from the _ctypes extension module, which has not been necessary since Mac OS X 10.2.

.. bpo: 45256 .. date: 2022-12-29-19-22-11 .. nonce: a0ee_H .. section: Tools/Demos

Fix a bug that caused an :exc:AttributeError to be raised in python-gdb.py when py-locals is used without a frame.

.. date: 2022-12-19-10-08-53 .. gh-issue: 100342 .. nonce: qDFlQG .. section: Tools/Demos

Add missing NULL check for possible allocation failure in *args parsing in Argument Clinic.

.. date: 2022-12-02-09-31-19 .. gh-issue: 99947 .. nonce: Ski7OC .. section: C API

Raising SystemError on import will now have its cause be set to the original unexpected exception.

.. date: 2022-11-30-16-39-22 .. gh-issue: 99240 .. nonce: 67nAX- .. section: C API

In argument parsing, after deallocating newly allocated memory, reset its pointer to NULL.

.. date: 2022-11-04-16-13-35 .. gh-issue: 98724 .. nonce: p0urWO .. section: C API

The :c:macro:Py_CLEAR, :c:macro:Py_SETREF and :c:macro:Py_XSETREF macros now only evaluate their arguments once. If an argument has side effects, these side effects are no longer duplicated. Patch by Victor Stinner.