3.11.0a7

.. bpo: 47212 .. date: 2022-04-05-11-29-21 .. nonce: leF4pz .. release date: 2022-04-05 .. section: Core and Builtins

Raise :exc:IndentationError instead of :exc:SyntaxError for a bare except with no following indent. Improve :exc:SyntaxError locations for an un-parenthesized generator used as arguments. Patch by Matthieu Dartiailh.

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.. bpo: 47186 .. date: 2022-04-04-17-41-10 .. nonce: aQWoSh .. section: Core and Builtins

Replace :opcode:JUMP_IF_NOT_EG_MATCH by :opcode:CHECK_EG_MATCH + jump.

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.. bpo: 47176 .. date: 2022-04-02-14-32-21 .. nonce: kTygYI .. section: Core and Builtins

Emscripten builds cannot handle signals in the usual way due to platform limitations. Python can now handle signals. To use, set Module.Py_EmscriptenSignalBuffer to be a single byte SharedArrayBuffer and set Py_EMSCRIPTEN_SIGNAL_HANDLING to 1. Writing a number into the SharedArrayBuffer will cause the corresponding signal to be raised into the Python thread.

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.. bpo: 47186 .. date: 2022-04-01-11-53-59 .. nonce: RBCPk8 .. section: Core and Builtins

Replace :opcode:JUMP_IF_NOT_EXC_MATCH by :opcode:CHECK_EXC_MATCH + jump.

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.. bpo: 47120 .. date: 2022-03-31-21-43-57 .. nonce: NgxQbA .. section: Core and Builtins

Replace the absolute jump opcode :opcode:JUMP_NO_INTERRUPT by the relative :opcode:JUMP_BACKWARD_NO_INTERRUPT.

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.. bpo: 46841 .. date: 2022-03-31-15-57-42 .. nonce: U-25Z6 .. section: Core and Builtins

Avoid unnecessary allocations when comparing code objects.

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.. bpo: 47182 .. date: 2022-03-31-15-37-02 .. nonce: e_4SsC .. section: Core and Builtins

Fix a crash when using a named unicode character like "\N{digit nine}" after the main interpreter has been initialized a second time.

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.. bpo: 47162 .. date: 2022-03-30-13-13-25 .. nonce: yDJMUm .. section: Core and Builtins

WebAssembly cannot deal with bad function pointer casts (different count or types of arguments). Python can now use call trampolines to mitigate the problem. Define :c:macro:PY_CALL_TRAMPOLINE to enable call trampolines.

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.. bpo: 46775 .. date: 2022-03-30-02-36-25 .. nonce: e3Oxqf .. section: Core and Builtins

Some Windows system error codes(>= 10000) are now mapped into the correct errno and may now raise a subclass of :exc:OSError. Patch by Donghee Na.

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.. bpo: 47129 .. date: 2022-03-26-16-35-57 .. nonce: hDg2Vt .. section: Core and Builtins

Improve error messages in f-string syntax errors concerning empty expressions.

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.. bpo: 47117 .. date: 2022-03-26-15-45-57 .. nonce: 60W6GQ .. section: Core and Builtins

Fix a crash if we fail to decode characters in interactive mode if the tokenizer buffers are uninitialized. Patch by Pablo Galindo.

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.. bpo: 47127 .. date: 2022-03-26-12-21-53 .. nonce: Mh86RB .. section: Core and Builtins

Speed up calls to c functions with keyword arguments by 25% with specialization. Patch by Kumar Aditya.

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.. bpo: 47120 .. date: 2022-03-25-21-51-10 .. nonce: 9YJ-Xw .. section: Core and Builtins

Replaced :opcode:JUMP_ABSOLUTE by the relative jump :opcode:JUMP_BACKWARD.

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.. bpo: 42197 .. date: 2022-03-22-15-12-28 .. nonce: SwrrFO .. section: Core and Builtins

:c:func:!PyFrame_FastToLocalsWithError and :c:func:!PyFrame_LocalsToFast are no longer called during profiling nor tracing. C code can access the f_locals attribute of :c:type:PyFrameObject by calling :c:func:PyFrame_GetLocals.

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.. bpo: 47070 .. date: 2022-03-19-21-50-59 .. nonce: wPcsQh .. section: Core and Builtins

Improve performance of array_inplace_repeat by reducing the number of invocations of memcpy. Refactor the repeat and inplace repeat methods of array, bytes, bytearray and unicodeobject to use the common _PyBytes_Repeat.

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.. bpo: 47053 .. date: 2022-03-17-22-47-29 .. nonce: QAXk8Q .. section: Core and Builtins

Reduce de-optimization in the specialized BINARY_OP_INPLACE_ADD_UNICODE opcode.

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.. bpo: 47045 .. date: 2022-03-17-16-25-57 .. nonce: xQgHul .. section: Core and Builtins

Remove the f_state field from the _PyInterpreterFrame struct. Add the owner field to the _PyInterpreterFrame struct to make ownership explicit to simplify clearing and deallocing frames and generators.

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.. bpo: 46968 .. date: 2022-03-17-14-22-23 .. nonce: 4gz4NA .. section: Library

Check for the existence of the "sys/auxv.h" header in :mod:faulthandler to avoid compilation problems in systems where this header doesn't exist. Patch by Pablo Galindo

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.. bpo: 46329 .. date: 2022-03-16-12-19-25 .. nonce: 9oS0HT .. section: Core and Builtins

Use low bit of LOAD_GLOBAL to indicate whether to push a NULL before the global. Helps streamline the call sequence a bit.

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.. bpo: 46841 .. date: 2022-03-16-11-05-35 .. nonce: yUoIHg .. section: Core and Builtins

Quicken bytecode in-place by storing it as part of the corresponding PyCodeObject.

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.. bpo: 47012 .. date: 2022-03-14-11-15-11 .. nonce: 5L6NoE .. section: Core and Builtins

Speed up iteration of :class:bytes and :class:bytearray by 30%. Patch by Kumar Aditya.

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.. bpo: 47009 .. date: 2022-03-14-09-45-10 .. nonce: ZI05b5 .. section: Core and Builtins

Improved the performance of :meth:list.append and list comprehensions by optimizing for the common case, where no resize is needed. Patch by Dennis Sweeney.

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.. bpo: 47005 .. date: 2022-03-13-21-04-20 .. nonce: OHBfCc .. section: Core and Builtins

Improve performance of bytearray_repeat and bytearray_irepeat by reducing the number of invocations of memcpy.

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.. bpo: 46829 .. date: 2022-03-12-21-07-21 .. nonce: cpGoPV .. section: Library

Deprecate passing a message into :meth:asyncio.Future.cancel and :meth:asyncio.Task.cancel

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.. bpo: 46993 .. date: 2022-03-12-09-44-31 .. nonce: -13hGo .. section: Core and Builtins

Speed up :class:bytearray creation from :class:list and :class:tuple by 40%. Patch by Kumar Aditya.

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.. bpo: 39829 .. date: 2022-03-11-09-39-01 .. nonce: mlW3Su .. section: Core and Builtins

Removed the __len__() call when initializing a list and moved initializing to list_extend. Patch by Jeremiah Pascual.

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.. bpo: 46944 .. date: 2022-03-08-10-50-42 .. nonce: cnaIK3 .. section: Core and Builtins

Speed up throwing exception in generator with :c:macro:METH_FASTCALL calling convention. Patch by Kumar Aditya.

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.. bpo: 46841 .. date: 2022-03-07-15-54-39 .. nonce: 7wG92r .. section: Core and Builtins

Modify :opcode:STORE_SUBSCR to use an inline cache entry (rather than its oparg) as an adaptive counter.

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.. bpo: 46841 .. date: 2022-03-06-10-37-36 .. nonce: O12Pba .. section: Core and Builtins

Use inline caching for :opcode:!PRECALL and :opcode:CALL, and remove the internal machinery for managing the (now unused) non-inline caches.

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.. bpo: 46881 .. date: 2022-03-03-09-08-17 .. nonce: ckD4tT .. section: Core and Builtins

Statically allocate and initialize the latin1 characters.

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.. bpo: 46838 .. date: 2022-02-25-22-42-30 .. nonce: RB6kEy .. section: Core and Builtins

Improve syntax errors for incorrect function definitions. Patch by Pablo Galindo

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.. bpo: 43721 .. date: 2022-02-01-10-05-27 .. nonce: -1XAIo .. section: Core and Builtins

Fix docstrings of :attr:~property.getter, :attr:~property.setter, and :attr:~property.deleter to clarify that they create a new copy of the property.

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.. bpo: 43224 .. date: 2022-01-20-16-48-09 .. nonce: WDihrT .. section: Core and Builtins

Make grammar changes required for PEP 646.

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.. bpo: 47208 .. date: 2022-04-04-08-54-31 .. nonce: cOh9xZ .. section: Library

Allow vendors to override :const:CTYPES_MAX_ARGCOUNT.

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.. bpo: 23689 .. date: 2022-04-03-13-19-08 .. nonce: TFSc3E .. section: Library

:mod:re module: fix memory leak when a match is terminated by a signal or memory allocation failure. Patch by Ma Lin.

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.. bpo: 47167 .. date: 2022-03-30-18-35-50 .. nonce: nCNHsB .. section: Library

Allow overriding a future compliance check in :class:asyncio.Task.

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.. bpo: 47151 .. date: 2022-03-30-01-17-43 .. nonce: z-nQkR .. section: Library

When subprocess tries to use vfork, it now falls back to fork if vfork returns an error. This allows use in situations where vfork isn't allowed by the OS kernel.

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.. bpo: 47152 .. date: 2022-03-29-19-14-53 .. nonce: 5rl5ZK .. section: Library

Convert the :mod:re module into a package. Deprecate modules sre_compile, sre_constants and sre_parse.

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.. bpo: 4833 .. date: 2022-03-28-20-16-37 .. nonce: 2vSUE5 .. section: Library

Add :meth:ZipFile.mkdir

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.. bpo: 27929 .. date: 2022-03-28-13-35-50 .. nonce: j5mAmV .. section: Library

Fix :meth:asyncio.loop.sock_connect to only resolve names for :const:socket.AF_INET or :const:socket.AF_INET6 families. Resolution may not make sense for other families, like :const:socket.AF_BLUETOOTH and :const:socket.AF_UNIX.

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.. bpo: 14265 .. date: 2022-03-27-10-41-24 .. nonce: OBMlAi .. section: Library

Adds the fully qualified test name to unittest output

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.. bpo: 47061 .. date: 2022-03-26-13-14-43 .. nonce: QLxbC6 .. section: Library

Deprecate the aifc module.

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.. bpo: 39622 .. date: 2022-03-25-01-27-25 .. nonce: ieBIMp .. section: Library

Handle Ctrl+C in asyncio programs to interrupt the main task.

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.. bpo: 47101 .. date: 2022-03-23-15-31-02 .. nonce: rVSld- .. section: Library

:const:hashlib.algorithms_available now lists only algorithms that are provided by activated crypto providers on OpenSSL 3.0. Legacy algorithms are not listed unless the legacy provider has been loaded into the default OSSL context.

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.. bpo: 47099 .. date: 2022-03-23-14-16-38 .. nonce: 2raait .. section: Library

All :exc:URLError exception messages raised in :class:urllib.request.URLopener now contain a colon between ftp error and the rest of the message. Previously, :func:~urllib.request.URLopener.open_ftp missed the colon. Patch by Oleg Iarygin.

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.. bpo: 47099 .. date: 2022-03-23-13-55-41 .. nonce: P6quRP .. section: Library

Exception chaining is changed from :func:Exception.with_traceback/:func:sys.exc_info to :pep:3134. Patch by Oleg Iarygin.

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.. bpo: 47095 .. date: 2022-03-23-12-07-26 .. nonce: P3YTrh .. section: Library

:mod:hashlib's internal _blake2 module now prefers libb2 from https://www.blake2.net/ over Python's vendored copy of blake2.

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.. bpo: 47098 .. date: 2022-03-23-10-07-41 .. nonce: 7AN_qp .. section: Library

The Keccak Code Package for :mod:hashlib's internal _sha3 module has been replaced with tiny_sha3. The module is used as fallback when Python is built without OpenSSL.

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.. bpo: 47088 .. date: 2022-03-22-19-18-31 .. nonce: JM1kNI .. section: Library

Implement :data:typing.LiteralString, part of :pep:675. Patch by Jelle Zijlstra.

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.. bpo: 42885 .. date: 2022-03-21-08-32-19 .. nonce: LCnTTp .. section: Library

Optimize :func:re.search, :func:re.split, :func:re.findall, :func:re.finditer and :func:re.sub for regular expressions starting with \A or ^.

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.. bpo: 23691 .. date: 2022-03-20-22-13-24 .. nonce: Nc2TrW .. section: Library

Protect the :func:re.finditer iterator from re-entering.

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.. bpo: 47067 .. date: 2022-03-20-17-15-56 .. nonce: XXLnje .. section: Library

Optimize calling GenericAlias objects by using :pep:590 vectorcall and by replacing PyObject_SetAttrString with PyObject_SetAttr.

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.. bpo: 28080 .. date: 2022-03-20-15-54-41 .. nonce: kn35Vk .. section: Library

Add the metadata_encoding parameter in the :class:zipfile.ZipFile constructor and the --metadata-encoding option in the :mod:zipfile CLI to allow reading zipfiles using non-standard codecs to encode the filenames within the archive.

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.. bpo: 47000 .. date: 2022-03-20-13-00-08 .. nonce: p8HpG0 .. section: Library

Make :func:io.text_encoding returns "utf-8" when UTF-8 mode is enabled.

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.. bpo: 42369 .. date: 2022-03-19-19-56-04 .. nonce: Ok828t .. section: Library

Fix thread safety of :meth:zipfile._SharedFile.tell to avoid a "zipfile.BadZipFile: Bad CRC-32 for file" exception when reading a :class:ZipFile from multiple threads.

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.. bpo: 38256 .. date: 2022-03-19-15-54-41 .. nonce: FoMbjE .. section: Library

Fix :func:binascii.crc32 when it is compiled to use zlib'c crc32 to work properly on inputs 4+GiB in length instead of returning the wrong result. The workaround prior to this was to always feed the function data in increments smaller than 4GiB or to just call the zlib module function.

We also have :func:binascii.crc32 release the GIL when computing on larger inputs as :func:zlib.crc32 and :mod:hashlib do.

This also boosts performance on Windows as it now uses the zlib crc32 implementation for :func:binascii.crc32 for a 2-3x speedup.

That the stdlib has a crc32 API in two modules is a known historical oddity. This moves us closer to a single implementation behind them.

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.. bpo: 47066 .. date: 2022-03-19-14-12-23 .. nonce: we3YFx .. section: Library

Global inline flags (e.g. (?i)) can now only be used at the start of the regular expressions. Using them not at the start of expression was deprecated since Python 3.6.

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.. bpo: 39394 .. date: 2022-03-19-13-38-29 .. nonce: 7j6WL6 .. section: Library

A warning about inline flags not at the start of the regular expression now contains the position of the flag.

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.. bpo: 433030 .. date: 2022-03-19-08-42-57 .. nonce: UTwRX7 .. section: Library

Add support of atomic grouping ((?>...)) and possessive quantifiers (*+, ++, ?+, {m,n}+) in :mod:regular expressions <re>.

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.. bpo: 47062 .. date: 2022-03-18-22-46-18 .. nonce: RNc99_ .. section: Library

Implement :class:asyncio.Runner context manager.

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.. bpo: 46382 .. date: 2022-03-18-17-25-57 .. nonce: zQUJ66 .. section: Library

:func:~dataclasses.dataclass slots=True now correctly omits slots already defined in base classes. Patch by Arie Bovenberg.

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.. bpo: 47057 .. date: 2022-03-18-14-22-38 .. nonce: n-IHbt .. section: Library

Use FASTCALL convention for FutureIter.throw()

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.. bpo: 47061 .. date: 2022-03-18-13-30-40 .. nonce: etLHK5 .. section: Library

Deprecate the various modules listed by :pep:594:

aifc, asynchat, asyncore, audioop, cgi, cgitb, chunk, crypt, imghdr, msilib, nntplib, nis, ossaudiodev, pipes, smtpd, sndhdr, spwd, sunau, telnetlib, uu, xdrlib

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.. bpo: 34790 .. date: 2022-03-17-19-38-40 .. nonce: zQIiVJ .. section: Library

Remove passing coroutine objects to :func:asyncio.wait.

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.. bpo: 47039 .. date: 2022-03-17-01-54-13 .. nonce: 0Yxv0K .. section: Library

Normalize repr() of asyncio future and task objects.

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.. bpo: 2604 .. date: 2022-03-16-18-25-19 .. nonce: jeopdL .. section: Library

Fix bug where doctests using globals would fail when run multiple times.

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.. bpo: 45150 .. date: 2022-03-16-11-52-52 .. nonce: kYbIME .. section: Library

Add :func:hashlib.file_digest helper for efficient hashing of file object.

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.. bpo: 34861 .. date: 2022-03-16-08-49-12 .. nonce: p8ugVg .. section: Library

Made cumtime the default sorting key for cProfile

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.. bpo: 45997 .. date: 2022-03-15-18-32-12 .. nonce: 4n2aVU .. section: Library

Fix :class:asyncio.Semaphore re-aquiring FIFO order.

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.. bpo: 47022 .. date: 2022-03-15-09-29-52 .. nonce: uaEDcI .. section: Library

The :mod:!asynchat, :mod:!asyncore and :mod:!smtpd modules have been deprecated since at least Python 3.6. Their documentation and deprecation warnings and have now been updated to note they will removed in Python 3.12 (:pep:594).

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.. bpo: 43253 .. date: 2022-03-15-07-53-45 .. nonce: rjdLFj .. section: Library

Fix a crash when closing transports where the underlying socket handle is already invalid on the Proactor event loop.

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.. bpo: 40280 .. date: 2022-03-14-09-26-42 .. nonce: 2-k8TV .. section: Library

:func:select.select now passes NULL to select for each empty fdset.

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.. bpo: 47004 .. date: 2022-03-13-15-04-05 .. nonce: SyYpxd .. section: Library

Apply bugfixes from importlib_metadata 4.11.3, including bugfix for EntryPoint.extras, which was returning match objects and not the extras strings.

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.. bpo: 46998 .. date: 2022-03-13-08-52-58 .. nonce: cHh-9O .. section: Library

Allow subclassing of :class:typing.Any. Patch by Shantanu Jain.

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.. bpo: 46995 .. date: 2022-03-12-13-50-42 .. nonce: 2kdNDg .. section: Library

Deprecate missing :meth:asyncio.Task.set_name for third-party task implementations, schedule making it mandatory in Python 3.13.

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.. bpo: 46994 .. date: 2022-03-12-12-34-13 .. nonce: d7hPdz .. section: Library

Accept explicit contextvars.Context in :func:asyncio.create_task and :meth:asyncio.loop.create_task.

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.. bpo: 46981 .. date: 2022-03-12-11-30-42 .. nonce: ltWCxH .. section: Library

typing.get_args(typing.Tuple[()]) now returns () instead of ((),).

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.. bpo: 46968 .. date: 2022-03-11-17-56-25 .. nonce: pPVvNo .. section: Library

Add os.sysconf_names['SC_MINSIGSTKSZ'].

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.. bpo: 46985 .. date: 2022-03-11-13-34-16 .. nonce: BgoMr2 .. section: Library

Upgrade pip wheel bundled with ensurepip (pip 22.0.4)

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.. bpo: 46968 .. date: 2022-03-10-14-51-11 .. nonce: ym2QxL .. section: Library

:mod:faulthandler: On Linux 5.14 and newer, dynamically determine size of signal handler stack size CPython allocates using getauxval(AT_MINSIGSTKSZ). This changes allows for Python extension's request to Linux kernel to use AMX_TILE instruction set on Sapphire Rapids Xeon processor to succeed, unblocking use of the ISA in frameworks.

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.. bpo: 46917 .. date: 2022-03-10-14-47-16 .. nonce: s19zcy .. section: Library

The :data:math.nan value is now always available. Patch by Victor Stinner.

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.. bpo: 46955 .. date: 2022-03-08-22-41-59 .. nonce: IOoonN .. section: Library

Expose :class:asyncio.base_events.Server as :class:asyncio.Server. Patch by Stefan Zabka.

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.. bpo: 23325 .. date: 2022-03-08-11-34-06 .. nonce: 3VQnfo .. section: Library

The :mod:signal module no longer assumes that :const:~signal.SIG_IGN and :const:~signal.SIG_DFL are small int singletons.

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.. bpo: 46932 .. date: 2022-03-07-20-20-34 .. nonce: xbarAs .. section: Library

Update bundled libexpat to 2.4.7

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.. bpo: 46933 .. date: 2022-03-05-21-51-31 .. nonce: 6yzWtb .. section: Library

The :mod:pwd module is now optional. :func:os.path.expanduser returns the path when the :mod:pwd module is not available.

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.. bpo: 40059 .. date: 2022-02-23-01-11-08 .. nonce: Iwc9UH .. section: Library

:pep:680, the :mod:tomllib module. Adds support for parsing TOML.

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.. bpo: 464471 .. date: 2022-02-21-11-41-23 .. nonce: fL06TV .. section: Library

:func:asyncio.timeout and :func:asyncio.timeout_at context managers added. Patch by Tin Tvrtković and Andrew Svetlov.

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.. bpo: 46805 .. date: 2022-02-20-23-03-32 .. nonce: HZ8xWG .. section: Library

Added raw datagram socket functions for asyncio: :meth:~asyncio.AbstractEventLoop.sock_sendto, :meth:~asyncio.AbstractEventLoop.sock_recvfrom and :meth:~asyncio.AbstractEventLoop.sock_recvfrom_into.

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.. bpo: 46644 .. date: 2022-02-05-22-14-44 .. nonce: P--1Cz .. section: Library

No longer require valid typeforms to be callable. This allows :data:typing.Annotated to wrap :data:typing.ParamSpecArgs and :data:dataclasses.InitVar. Patch by Gregory Beauregard.

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.. bpo: 46581 .. date: 2022-02-01-11-32-47 .. nonce: t7Zw65 .. section: Library

Brings :class:ParamSpec propagation for :class:GenericAlias in line with :class:Concatenate (and others).

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.. bpo: 45413 .. date: 2022-01-31-15-19-38 .. nonce: 1vaS0V .. section: Library

Define posix_venv and nt_venv :ref:sysconfig installation schemes <installation_paths> to be used for bootstrapping new virtual environments. Add venv sysconfig installation scheme to get the appropriate one of the above. The schemes are identical to the pre-existing posix_prefix and nt install schemes. The :mod:venv module now uses the venv scheme to create new virtual environments instead of hardcoding the paths depending only on the platform. Downstream Python distributors customizing the posix_prefix or nt install scheme in a way that is not compatible with the install scheme used in virtual environments are encouraged not to customize the venv schemes. When Python itself runs in a virtual environment, :func:sysconfig.get_default_scheme and :func:sysconfig.get_preferred_scheme with key="prefix" returns venv.

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.. bpo: 43224 .. date: 2022-01-30-22-05-53 .. nonce: E-eT22 .. section: Library

Implement support for PEP 646 in typing.py.

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.. bpo: 43224 .. date: 2022-01-30-20-32-40 .. nonce: zqrQsj .. section: Library

Allow unpacking types.GenericAlias objects, e.g. *tuple[int, str].

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.. bpo: 46557 .. date: 2022-01-28-01-23-25 .. nonce: XSbhyQ .. section: Library

Warnings captured by the logging module are now logged without a format string to prevent systems that group logs by the msg argument from grouping captured warnings together.

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.. bpo: 41370 .. date: 2022-01-27-11-54-16 .. nonce: gYxCPE .. section: Library

:func:typing.get_type_hints now supports evaluating strings as forward references in :ref:PEP 585 generic aliases <types-genericalias>.

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.. bpo: 46607 .. date: 2022-01-26-18-30-34 .. nonce: xnhT4a .. section: Library

Add :exc:DeprecationWarning to :class:!LegacyInterpolation, deprecated in the docstring since Python 3.2. Will be removed in Python 3.13. Use :class:BasicInterpolation or :class:ExtendedInterpolation instead.

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.. bpo: 26120 .. date: 2022-01-25-15-45-04 .. nonce: YzrBMO .. section: Library

:mod:pydoc now excludes future imports from the module's data items.

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.. bpo: 46480 .. date: 2022-01-23-16-33-07 .. nonce: E4jHlh .. section: Library

Add :func:typing.assert_type. Patch by Jelle Zijlstra.

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.. bpo: 46421 .. date: 2022-01-18-01-29-38 .. nonce: 9LdmNr .. section: Library

Fix a unittest issue where if the command was invoked as python -m unittest and the filename(s) began with a dot (.), a ValueError is returned.

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.. bpo: 46245 .. date: 2022-01-03-20-12-14 .. nonce: 3w4RlA .. section: Library

Add optional parameter dir_fd in :func:shutil.rmtree.

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.. bpo: 22859 .. date: 2021-12-29-19-37-49 .. nonce: AixHW7 .. section: Library

:meth:!unittest.TestProgram.usageExit is marked as deprecated, to be removed in Python 3.13.

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.. bpo: 46170 .. date: 2021-12-26-14-45-51 .. nonce: AQ7kSM .. section: Library

Improve the error message when you try to subclass an instance of :class:typing.NewType.

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.. bpo: 40296 .. date: 2021-12-25-14-13-14 .. nonce: p0YVGB .. section: Library

Fix supporting generic aliases in :mod:pydoc.

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.. bpo: 20392 .. date: 2021-12-22-12-02-27 .. nonce: CLAFIp .. section: Library

Fix inconsistency with uppercase file extensions in :meth:MimeTypes.guess_type. Patch by Kumar Aditya.

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.. bpo: 46030 .. date: 2021-12-10-07-07-47 .. nonce: UN349J .. section: Library

Add LOCAL_CREDS, LOCAL_CREDS_PERSISTENT and SCM_CREDS2 FreeBSD constants to the socket module.

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.. bpo: 44439 .. date: 2021-11-08-20-27-41 .. nonce: I_8qro .. section: Library

Fix .write() method of a member file in ZipFile, when the input data is an object that supports the buffer protocol, the file length may be wrong.

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.. bpo: 45171 .. date: 2021-09-11-16-06-54 .. nonce: ec597j .. section: Library

Fix handling of the stacklevel argument to logging functions in the :mod:logging module so that it is consistent across all logging functions and, as advertised, similar to the stacklevel argument used in :meth:~warnings.warn.

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.. bpo: 24959 .. date: 2021-09-06-15-46-53 .. nonce: UVFgiO .. section: Library

Fix bug where :mod:unittest sometimes drops frames from tracebacks of exceptions raised in tests.

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.. bpo: 44859 .. date: 2021-08-10-00-05-53 .. nonce: 9e9_3V .. section: Library

Raise more accurate and :pep:249 compatible exceptions in :mod:sqlite3.

• Raise :exc:~sqlite3.InterfaceError instead of :exc:~sqlite3.ProgrammingError for SQLITE_MISUSE errors.
• Don't overwrite :exc:BufferError with :exc:ValueError when conversion to BLOB fails.
• Raise :exc:~sqlite3.ProgrammingError instead of :exc:~sqlite3.Warning if user tries to :meth:~sqlite3.Cursor.execute more than one SQL statement.
• Raise :exc:~sqlite3.ProgrammingError instead of :exc:ValueError if an SQL query contains null characters.

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.. bpo: 44493 .. date: 2021-07-26-10-46-49 .. nonce: xp3CRH .. section: Library

Add missing terminated NUL in sockaddr_un's length

This was potentially observable when using non-abstract AF_UNIX datagram sockets to processes written in another programming language.

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.. bpo: 41930 .. date: 2021-06-17-00-02-58 .. nonce: JS6fsd .. section: Library

Add :meth:~sqlite3.Connection.serialize and :meth:~sqlite3.Connection.deserialize support to :mod:sqlite3. Patch by Erlend E. Aasland.

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.. bpo: 33178 .. date: 2021-04-20-16-48-07 .. nonce: kSnWwb .. section: Library

Added :class:ctypes.BigEndianUnion and :class:ctypes.LittleEndianUnion classes, as originally documented in the library docs but not yet implemented.

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.. bpo: 43352 .. date: 2021-03-31-15-22-45 .. nonce: nSjMuE .. section: Library

Add an Barrier object in synchronization primitives of asyncio Lib in order to be consistent with Barrier from threading and multiprocessing libs*

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.. bpo: 35859 .. date: 2019-03-14-09-08-25 .. nonce: 8lFdLe .. section: Library

:mod:re module, fix a few bugs about capturing group. In rare cases, capturing group gets an incorrect string. Patch by Ma Lin.

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.. bpo: 45099 .. date: 2022-03-29-13-25-49 .. nonce: dagdhx .. section: Documentation

Document internal :mod:asyncio API.

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.. bpo: 47126 .. date: 2022-03-26-12-20-16 .. nonce: p6_Ovm .. section: Documentation

Update PEP URLs to :pep:676's new canonical form.

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.. bpo: 47040 .. date: 2022-03-17-13-35-28 .. nonce: 4Dn48U .. section: Documentation

Clarified the old Python versions compatibility note of :func:binascii.crc32 / :func:zlib.adler32 / :func:zlib.crc32 functions.

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.. bpo: 46033 .. date: 2022-01-03-18-50-39 .. nonce: 7WeF0f .. section: Documentation

Clarify for statement execution in its doc.

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.. bpo: 45790 .. date: 2021-11-12-11-03-55 .. nonce: 6yuhe8 .. section: Documentation

Adjust inaccurate phrasing in :doc:../extending/newtypes_tutorial about the ob_base field and the macros used to access its contents.

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.. bpo: 42340 .. date: 2020-11-12-21-26-31 .. nonce: apumUL .. section: Documentation

Document that in some circumstances :exc:KeyboardInterrupt may cause the code to enter an inconsistent state. Provided a sample workaround to avoid it if needed.

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.. bpo: 41233 .. date: 2020-07-07-22-54-51 .. nonce: lyUJ8L .. section: Documentation

Link the errnos referenced in Doc/library/exceptions.rst to their respective section in Doc/library/errno.rst, and vice versa. Previously this was only done for EINTR and InterruptedError. Patch by Yan "yyyyyyyan" Orestes.

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.. bpo: 47205 .. date: 2022-04-03-14-38-21 .. nonce: hbbTnh .. section: Tests

Skip test for :func:~os.sched_getaffinity and :func:~os.sched_setaffinity error case on FreeBSD.

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.. bpo: 46126 .. date: 2022-03-26-11-41-19 .. nonce: q14Ioy .. section: Tests

Restore 'descriptions' when running tests internally.

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.. bpo: 47104 .. date: 2022-03-23-22-45-51 .. nonce: _esUq8 .. section: Tests

Rewrite :func:asyncio.to_thread tests to use :class:unittest.IsolatedAsyncioTestCase.

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.. bpo: 40280 .. date: 2022-03-19-10-25-04 .. nonce: wBRSel .. section: Tests

The test suite is now passing on the Emscripten platform. All fork, socket, and subprocess-based tests are skipped.

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.. bpo: 47037 .. date: 2022-03-16-21-29-30 .. nonce: xcrLpJ .. section: Tests

Skip strftime("%4Y") feature test on Windows. It can cause an assertion error in debug builds.

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.. bpo: 46587 .. date: 2022-03-14-17-10-35 .. nonce: ASDsJX .. section: Tests

Skip tests if platform's strftime does not support non-portable glibc extensions.

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.. bpo: 47015 .. date: 2022-03-13-23-43-40 .. nonce: FjmCsz .. section: Tests

A test case for :func:os.sendfile is converted from deprecated :mod:!asyncore (see :pep:594) to :mod:asyncio. Patch by Oleg Iarygin.

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.. bpo: 40280 .. date: 2022-04-02-17-52-38 .. nonce: U8Dd0H .. section: Build

Add configure option :option:--enable-wasm-dynamic-linking to enable dlopen and MAIN_MODULE / SIDE_MODULE on wasm32-emscripten.

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.. bpo: 46023 .. date: 2022-04-01-16-12-53 .. nonce: 1Z1OcC .. section: Build

makesetup now detects and skips all duplicated module definitions. The first entry wins.

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.. bpo: 40280 .. date: 2022-03-24-12-12-35 .. nonce: eAQWrM .. section: Build

Add SOABI wasm32-emscripten for Emscripten and wasm32-wasi for WASI on 32bit WASM as well as wasm64 counter parts.

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.. bpo: 47032 .. date: 2022-03-16-00-37-40 .. nonce: tsS9KE .. section: Build

Ensure Windows install builds fail correctly with a non-zero exit code when part of the build fails.

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.. bpo: 47024 .. date: 2022-03-15-09-28-55 .. nonce: t7-dcu .. section: Build

Update OpenSSL to 1.1.1n for macOS installers and all Windows builds.

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.. bpo: 46996 .. date: 2022-03-12-18-09-31 .. nonce: SygzVz .. section: Build

The :mod:tkinter package now requires Tcl/Tk version 8.5.12 or newer.

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.. bpo: 46973 .. date: 2022-03-10-14-30-39 .. nonce: _LEvnc .. section: Build

Add regen-configure make target to regenerate configure script with Christian's container image quay.io/tiran/cpython_autoconf:269.

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.. bpo: 46917 .. date: 2022-03-10-09-37-05 .. nonce: fry4aK .. section: Build

Building Python now requires support of IEEE 754 floating-point numbers. Patch by Victor Stinner.

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.. bpo: 45774 .. date: 2022-03-04-21-24-02 .. nonce: 9AhC0r .. section: Build

configure now verifies that all SQLite C APIs needed for the :mod:sqlite3 extension module are found.

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.. bpo: 47194 .. date: 2022-04-01-14-57-40 .. nonce: IB0XL4 .. section: Windows

Update zlib to v1.2.12 to resolve :cve:2018-25032.

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.. bpo: 47171 .. date: 2022-03-30-19-55-00 .. nonce: MbqCWn .. section: Windows

Enables installing the :file:py.exe launcher on Windows ARM64.

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.. bpo: 46566 .. date: 2022-03-23-12-51-46 .. nonce: 4x4a7e .. section: Windows

Upgraded :ref:launcher to support a new -V:company/tag argument for full :pep:514 support and to detect ARM64 installs. The -64 suffix on arguments is deprecated, but still selects any non-32-bit install. Setting :envvar:PYLAUNCHER_ALLOW_INSTALL and specifying a version that is not installed will attempt to install the requested version from the Microsoft Store.

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.. bpo: 47086 .. date: 2022-03-21-20-45-01 .. nonce: bIuKlF .. section: Windows

The installer for Windows now includes documentation as loose HTML files rather than a single compiled :file:.chm file.

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.. bpo: 46907 .. date: 2022-03-13-11-18-41 .. nonce: YLzxBM .. section: Windows

Update Windows installer to use SQLite 3.38.1.

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.. bpo: 44549 .. date: 2022-03-07-17-46-40 .. nonce: SPrGS9 .. section: Windows

Update bzip2 to 1.0.8 in Windows builds to mitigate :cve:2016-3189 and :cve:2019-12900.

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.. bpo: 46948 .. date: 2022-03-07-16-34-11 .. nonce: Ufd4tG .. section: Windows

Prevent :cve:2022-26488 by ensuring the Add to PATH option in the Windows installer uses the correct path when being repaired.

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.. bpo: 46890 .. date: 2022-03-17-09-55-02 .. nonce: GX-3OO .. section: macOS

Fix a regression in the setting of sys._base_executable in framework builds, and thereby fix a regression in :mod:venv virtual environments with such builds.

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.. bpo: 46907 .. date: 2022-03-13-11-11-31 .. nonce: Ql0z1E .. section: macOS

Update macOS installer to SQLite 3.38.1.

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.. bpo: 40280 .. date: 2022-04-03-11-47-45 .. nonce: Q_IJik .. section: Tools/Demos

Replace Emscripten's limited shell with Katie Bell's browser-ui REPL from python-wasm project.

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.. bpo: 40421 .. date: 2022-03-25-13-40-46 .. nonce: wJREl2 .. section: C API

Add PyFrame_GetBuiltins, PyFrame_GetGenerator and PyFrame_GetGlobals C-API functions to access frame object attributes safely from C code.

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.. bpo: 46850 .. date: 2022-03-22-16-59-34 .. nonce: lmEKLy .. section: C API

Move the private _PyFrameEvalFunction type, and private _PyInterpreterState_GetEvalFrameFunc() and _PyInterpreterState_SetEvalFrameFunc() functions to the internal C API. The _PyFrameEvalFunction callback function type now uses the _PyInterpreterFrame type which is part of the internal C API. Patch by Victor Stinner.

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.. bpo: 46850 .. date: 2022-03-22-16-48-02 .. nonce: 7M5dO7 .. section: C API

Move the private undocumented _PyEval_EvalFrameDefault() function to the internal C API. The function now uses the _PyInterpreterFrame type which is part of the internal C API. Patch by Victor Stinner.

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.. bpo: 46850 .. date: 2022-03-21-02-26-27 .. nonce: hU3c-O .. section: C API

Remove the private undocumented function _PyEval_CallTracing() from the C API. Call the public :func:sys.call_tracing function instead. Patch by Victor Stinner.

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.. bpo: 46850 .. date: 2022-03-21-01-30-14 .. nonce: Tfxde5 .. section: C API

Remove the private undocumented function _PyEval_GetCoroutineOriginTrackingDepth() from the C API. Call the public :func:sys.get_coroutine_origin_tracking_depth function instead. Patch by Victor Stinner.

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.. bpo: 46850 .. date: 2022-03-21-00-41-29 .. nonce: rOt771 .. section: C API

Remove the following private undocumented functions from the C API:

• _PyEval_GetAsyncGenFirstiter()
• _PyEval_GetAsyncGenFinalizer()
• _PyEval_SetAsyncGenFirstiter()
• _PyEval_SetAsyncGenFinalizer()

Call the public :func:sys.get_asyncgen_hooks and :func:sys.set_asyncgen_hooks functions instead. Patch by Victor Stinner.

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.. bpo: 46987 .. date: 2022-03-12-18-37-06 .. nonce: LWcwyN .. section: C API

Remove private functions _PySys_GetObjectId() and _PySys_SetObjectId(). Patch by Donghee Na.

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.. bpo: 46906 .. date: 2022-03-03-11-12-33 .. nonce: -olyBI .. section: C API

Add new functions to pack and unpack C double (serialize and deserialize): :c:func:PyFloat_Pack2, :c:func:PyFloat_Pack4, :c:func:PyFloat_Pack8, :c:func:PyFloat_Unpack2, :c:func:PyFloat_Unpack4 and :c:func:PyFloat_Unpack8. Patch by Victor Stinner.