3.13.0a2 - Cpython — ContextQMD

.. date: 2023-11-20-14-13-02 .. gh-issue: 112243 .. nonce: FKdQnr .. release date: 2023-11-22 .. section: Core and Builtins

Don't include comments in f-string debug expressions. Patch by Pablo Galindo

.. date: 2023-11-20-10-40-40 .. gh-issue: 112287 .. nonce: 15gWAK .. section: Core and Builtins

Slightly optimize the Tier 2 (uop) interpreter by only loading oparg and operand when needed. Also double the trace size limit again, to 512 this time.

.. date: 2023-11-19-15-57-23 .. gh-issue: 112266 .. nonce: BSJMbR .. section: Core and Builtins

Change docstrings of :attr:~object.__dict__ and :attr:~object.__weakref__.

.. date: 2023-11-17-16-49-32 .. gh-issue: 111807 .. nonce: QvjP9_ .. section: Core and Builtins

Lower the max parser stack depth to 1000 under WASI debug builds.

.. date: 2023-11-15-20-20-51 .. gh-issue: 111798 .. nonce: cs-3t3 .. section: Core and Builtins

When Python is built in debug mode, set the C recursion limit to 500 instead of 1500. A debug build is likely built with low optimization level which implies higher stack memory usage than a release build. Patch by Victor Stinner.

.. date: 2023-11-15-16-14-10 .. gh-issue: 106529 .. nonce: Y48ax9 .. section: Core and Builtins

Enable translating unspecialized FOR_ITER to Tier 2.

.. date: 2023-11-14-22-12-11 .. gh-issue: 111916 .. nonce: ZGCayL .. section: Core and Builtins

Make hashlib related modules thread-safe without the GIL

.. date: 2023-11-07-12-59-02 .. gh-issue: 81137 .. nonce: qFpJCY .. section: Core and Builtins

Deprecate assignment to a function's __code__ field when the new code object is of a mismatched type (e.g., from a generator to a plain function).

.. date: 2023-11-06-16-44-09 .. gh-issue: 79932 .. nonce: 2qv7uD .. section: Core and Builtins

Raise exception if :meth:frame.clear is called on a suspended frame.

.. date: 2023-11-05-20-59-10 .. gh-issue: 81925 .. nonce: wKHLSS .. section: Core and Builtins

Implement native thread ids for GNU KFreeBSD.

.. date: 2023-11-05-06-40-35 .. gh-issue: 111843 .. nonce: c045cB .. section: Core and Builtins

Use exponential backoff to reduce the number of failed tier 2 optimization attempts by over 99%.

.. date: 2023-11-04-13-36-51 .. gh-issue: 110829 .. nonce: Pa0CJI .. section: Core and Builtins

Joining a thread now ensures the underlying OS thread has exited. This is required for safer fork() in multi-threaded processes.

.. date: 2023-11-03-22-48-29 .. gh-issue: 109369 .. nonce: ELYaxJ .. section: Core and Builtins

Make sure that tier 2 traces are de-optimized if the code is instrumented

.. date: 2023-11-03-19-25-38 .. gh-issue: 111772 .. nonce: aRQvOn .. section: Core and Builtins

Specialize slot loads and stores for _Py_T_OBJECT as well as Py_T_OBJECT_EX

.. date: 2023-11-03-01-23-48 .. gh-issue: 111666 .. nonce: l8Q8G5 .. section: Core and Builtins

Speed up :meth:BaseExceptionGroup.derive, :meth:BaseExceptionGroup.subgroup, and :meth:BaseExceptionGroup.split by changing how they parse passed arguments.

.. date: 2023-11-03-01-04-55 .. gh-issue: 111654 .. nonce: scUhDO .. section: Core and Builtins

Fix runtime crash when some error happens in opcode LOAD_FROM_DICT_OR_DEREF.

.. date: 2023-11-02-15-00-57 .. gh-issue: 111623 .. nonce: BZxYc8 .. section: Core and Builtins

Add support for sharing tuples between interpreters using the cross-interpreter API. Patch by Anthony Shaw.

.. date: 2023-11-02-14-49-19 .. gh-issue: 111354 .. nonce: gIS3f- .. section: Core and Builtins

The oparg of :opcode:YIELD_VALUE is now 1 if the instruction is part of a yield-from or await, and 0 otherwise.

The SUSPENDED frame state is now split into SUSPENDED and SUSPENDED_YIELD_FROM. This simplifies the code in _PyGen_yf.

.. date: 2023-10-31-21-33-35 .. gh-issue: 111520 .. nonce: vw-rxJ .. section: Core and Builtins

Merge the Tier 1 (bytecode) and Tier 2 (micro-ops) interpreters together, moving the Tier 2 interpreter loop and switch into _PyEval_EvalFrameDefault() in Python/ceval.c. The Python/executor.c file is gone. Also the TIER_ONE and TIER_TWO macros are now handled by the code generator.

Beware! This changes the environment variables to enable micro-ops and their debugging to PYTHON_UOPS and PYTHON_LLTRACE.

.. date: 2023-10-31-14-25-21 .. gh-issue: 109181 .. nonce: 11h6Mc .. section: Core and Builtins

Speed up :class:Traceback object creation by lazily compute the line number. Patch by Pablo Galindo

.. date: 2023-10-29-20-11-21 .. gh-issue: 111420 .. nonce: IUT-GK .. section: Core and Builtins

Allow type comments in parenthesized with statements

.. date: 2023-10-29-12-33-33 .. gh-issue: 111438 .. nonce: bHTLLl .. section: Core and Builtins

Add support for sharing floats between interpreters using the cross-interpreter API. Patch by Anthony Shaw.

.. date: 2023-10-29-11-35-21 .. gh-issue: 111435 .. nonce: ageUWQ .. section: Core and Builtins

Add support for sharing of True and False between interpreters using the cross-interpreter API. Patch by Anthony Shaw.

.. date: 2023-10-27-19-38-33 .. gh-issue: 102388 .. nonce: vd5YUZ .. section: Core and Builtins

Fix a bug where iso2022_jp_3 and iso2022_jp_2004 codecs read out of bounds

.. date: 2023-10-27-12-17-49 .. gh-issue: 111366 .. nonce: _TSknV .. section: Core and Builtins

Fix an issue in the :mod:codeop that was causing :exc:SyntaxError exceptions raised in the presence of invalid syntax to not contain precise error messages. Patch by Pablo Galindo

.. date: 2023-10-27-11-51-40 .. gh-issue: 111380 .. nonce: vgSbir .. section: Core and Builtins

Fix a bug that was causing :exc:SyntaxWarning to appear twice when parsing if invalid syntax is encountered later. Patch by Pablo galindo

.. date: 2023-10-27-11-22-09 .. gh-issue: 111374 .. nonce: e9lrPZ .. section: Core and Builtins

Added a new environment variable :envvar:PYTHON_FROZEN_MODULES. It determines whether or not frozen modules are ignored by the import machinery, equivalent of the :option:-X frozen_modules <-X> command-line option.

.. date: 2023-10-26-18-45-20 .. gh-issue: 111354 .. nonce: GrT-Wf .. section: Core and Builtins

Remove oparg from :opcode:YIELD_VALUE. Change oparg of :opcode:RESUME to include information about the except-depth. These changes make it possible to simplify the code in generator close.

.. date: 2023-10-23-22-11-09 .. gh-issue: 94438 .. nonce: y2pITu .. section: Core and Builtins

Fix a regression that prevented jumping across is None and is not None when debugging. Patch by Savannah Ostrowski.

.. date: 2023-10-23-15-44-47 .. gh-issue: 67224 .. nonce: S4D6CR .. section: Core and Builtins

Show source lines in tracebacks when using the -c option when running Python. Patch by Pablo Galindo

.. date: 2023-10-20-23-14-06 .. gh-issue: 111123 .. nonce: jjVc3M .. section: Core and Builtins

Fix a bug where a :keyword:global declaration in an :keyword:except block is rejected when the global is used in the :keyword:else block.

.. date: 2023-10-17-11-03-45 .. gh-issue: 110938 .. nonce: X3sbMb .. section: Core and Builtins

Fix error messages for indented blocks with functions and classes with generic type parameters. Patch by Pablo Galindo

.. date: 2023-10-16-15-51-37 .. gh-issue: 109214 .. nonce: -RGTFH .. section: Core and Builtins

Remove unnecessary instruction pointer updates before returning from frames.

.. date: 2023-10-16-12-12-48 .. gh-issue: 110912 .. nonce: uEJGi_ .. section: Core and Builtins

Correctly display the traceback for :exc:MemoryError exceptions using the :mod:traceback module. Patch by Pablo Galindo

.. date: 2023-10-15-22-18-45 .. gh-issue: 109894 .. nonce: UAmo06 .. section: Core and Builtins

Fixed crash due to improperly initialized static :exc:MemoryError in subinterpreter.

.. date: 2023-10-15-20-45-35 .. gh-issue: 110892 .. nonce: oA6eVY .. section: Core and Builtins

Return NULL for PyTrace_RETURN events caused by an exception

.. date: 2023-10-14-12-19-34 .. gh-issue: 110864 .. nonce: -baPDE .. section: Core and Builtins

Fix argument parsing by _PyArg_UnpackKeywordsWithVararg for functions defining pos-or-keyword, vararg, and kw-only parameters.

.. date: 2023-10-13-16-55-55 .. gh-issue: 109094 .. nonce: ziL4cJ .. section: Core and Builtins

Replace prev_instr on the interpreter frame by instr_ptr which points to the beginning of the instruction that is currently executing (or will execute once the frame resumes).

.. date: 2023-10-13-09-21-29 .. gh-issue: 110805 .. nonce: vhU7A7 .. section: Core and Builtins

Allow the repl to show source code and complete tracebacks. Patch by Pablo Galindo

.. date: 2023-10-12-17-15-23 .. gh-issue: 110722 .. nonce: sjMwQe .. section: Core and Builtins

Add :envvar:PYTHON_PRESITE=package.module to import a module early in the interpreter lifecycle before site.py is executed. Python needs to be :ref:built in debug mode <debug-build> for this option to exist.

.. date: 2023-10-12-12-09-01 .. gh-issue: 110481 .. nonce: 3Er3it .. section: Core and Builtins

Implement biased reference counting in --disable-gil builds.

.. date: 2023-10-09-19-54-33 .. gh-issue: 110543 .. nonce: 1wrxO8 .. section: Core and Builtins

Fix regression in Python 3.12 where :meth:types.CodeType.replace would produce a broken code object if called on a module or class code object that contains a comprehension. Patch by Jelle Zijlstra.

.. date: 2023-09-30-17-30-11 .. gh-issue: 89519 .. nonce: hz2pZf .. section: Core and Builtins

Removed chained :class:classmethod descriptors (introduced in :issue:19072). This can no longer be used to wrap other descriptors such as :class:property. The core design of this feature was flawed and caused a number of downstream problems. To "pass-through" a :class:classmethod, consider using the :attr:!__wrapped__ attribute that was added in Python 3.10.

.. date: 2023-09-15-23-39-43 .. gh-issue: 103615 .. nonce: WZavly .. section: Core and Builtins

Use local events for opcode tracing

.. bpo: 46657 .. date: 2023-09-06-12-36-11 .. nonce: xea1T_ .. section: Core and Builtins

Add mimalloc memory allocator support.

.. date: 2023-08-31-11-42-16 .. gh-issue: 106718 .. nonce: _-57DA .. section: Core and Builtins

When PyConfig.stdlib_dir is explicitly set, it's now respected and won't be overridden by PyConfig.home.

.. date: 2023-07-20-11-41-16 .. gh-issue: 106905 .. nonce: AyZpuB .. section: Core and Builtins

Fix incorrect SystemError about AST constructor recursion depth mismatch.

.. date: 2022-12-27-02-51-45 .. gh-issue: 100445 .. nonce: C8f6ph .. section: Core and Builtins

Improve error message for unterminated strings with escapes.

.. bpo: 45759 .. date: 2021-11-10-10-40-05 .. nonce: WJoB3D .. section: Core and Builtins

Improved error messages for elif/else statements not matching any valid statements. Patch by Jeremiah Vivian.

.. date: 2023-11-14-18-43-55 .. gh-issue: 111942 .. nonce: x1pnrj .. section: Library

Fix SystemError in the TextIOWrapper constructor with non-encodable "errors" argument in non-debug mode.

.. date: 2023-11-14-16-31-59 .. gh-issue: 111995 .. nonce: OoX8JJ .. section: Library

Added the NI_IDN constant to the :mod:socket module when present in C at build time for use with :func:socket.getnameinfo.

.. date: 2023-11-11-16-42-48 .. gh-issue: 109538 .. nonce: cMG5ux .. section: Library

Issue warning message instead of having :class:RuntimeError be displayed when event loop has already been closed at :meth:StreamWriter.__del__.

.. date: 2023-11-10-22-08-28 .. gh-issue: 111942 .. nonce: MDFm6v .. section: Library

Fix crashes in :meth:io.TextIOWrapper.reconfigure when pass invalid arguments, e.g. non-string encoding.

.. date: 2023-11-09-12-57-43 .. gh-issue: 111460 .. nonce: TQaz9I .. section: Library

:mod:curses: restore wide character support (including :func:curses.unget_wch and :meth:~curses.window.get_wch) on macOS, which was unavailable due to a regression in Python 3.12.

.. date: 2023-11-09-10-45-56 .. gh-issue: 103791 .. nonce: sdfkja .. section: Library

:class:contextlib.suppress now supports suppressing exceptions raised as part of a :exc:BaseExceptionGroup, in addition to the recent support for :exc:ExceptionGroup.

.. date: 2023-11-08-23-32-03 .. gh-issue: 111835 .. nonce: ufFiuW .. section: Library

The :class:mmap.mmap class now has an :meth:~mmap.mmap.seekable method that can be used when a seekable file-like object is required. The :meth:~mmap.mmap.seek method now returns the new absolute position. Patch by Donghee Na.

.. date: 2023-11-08-15-58-57 .. gh-issue: 111804 .. nonce: uAXTOL .. section: Library

Remove posix.fallocate() under WASI as the underlying posix_fallocate() is not available in WASI preview2.

.. date: 2023-11-08-11-50-49 .. gh-issue: 111841 .. nonce: iSqdQf .. section: Library

Fix truncating arguments on an embedded null character in :meth:os.putenv and :meth:os.unsetenv on Windows.

.. date: 2023-11-08-07-42-53 .. gh-issue: 111768 .. nonce: g-WpnV .. section: Library

:func:wsgiref.util.is_hop_by_hop is now exposed correctly in __all__.

.. date: 2023-11-04-21-12-27 .. gh-issue: 80731 .. nonce: Wq51xg .. section: Library

Avoid executing the default function in :class:cmd.Cmd in an except block

.. date: 2023-11-04-10-24-25 .. gh-issue: 111541 .. nonce: x0RBI1 .. section: Library

Fix :mod:doctest for :exc:SyntaxError not-builtin subclasses.

.. date: 2023-11-04-01-20-23 .. gh-issue: 111719 .. nonce: fUiKBD .. section: Library

Add extra argument validation for alias command in :mod:pdb

.. date: 2023-11-02-12-15-46 .. gh-issue: 111482 .. nonce: FWqZIU .. section: Library

:mod:time: Make :func:time.clock_gettime and :func:time.clock_gettime_ns functions up to 2x faster by faster calling convention. Patch by Victor Stinner.

.. date: 2023-11-01-14-03-24 .. gh-issue: 110894 .. nonce: 7-wZxC .. section: Library

Call loop exception handler for exceptions in client_connected_cb of :func:asyncio.start_server so that applications can handle it. Patch by Kumar Aditya.

.. date: 2023-10-31-07-46-56 .. gh-issue: 111531 .. nonce: 6zUV_G .. section: Library

Fix reference leaks in bind_class() and bind_all() methods of :mod:tkinter widgets.

.. date: 2023-10-30-14-47-23 .. gh-issue: 111246 .. nonce: QJ_ehs .. section: Library

:meth:asyncio.loop.create_unix_server will now automatically remove the Unix socket when the server is closed.

.. date: 2023-10-30-08-50-46 .. gh-issue: 111356 .. nonce: Bc8LvA .. section: Library

Added :func:io.text_encoding, :data:io.DEFAULT_BUFFER_SIZE, and :class:io.IncrementalNewlineDecoder to io.__all__.

.. date: 2023-10-29-03-46-27 .. gh-issue: 66425 .. nonce: FWTdDo .. section: Library

Remove the code to set the REMOTE_HOST header from wsgiref module, as it is unreachable. This header is used for performance reasons, which is not necessary in the wsgiref module.

.. date: 2023-10-28-22-11-11 .. gh-issue: 111429 .. nonce: mJGxuQ .. section: Library

Speed up :meth:pathlib.PurePath.relative_to and :meth:~pathlib.PurePath.is_relative_to.

.. date: 2023-10-28-04-21-17 .. gh-issue: 111342 .. nonce: m8Ln1k .. section: Library

Fixed typo in :func:math.sumprod.

.. date: 2023-10-27-12-46-56 .. gh-issue: 68166 .. nonce: 0EbWW4 .. section: Library

Remove mention of not supported "vsapi" element type in :meth:tkinter.ttk.Style.element_create. Add tests for element_create() and other ttk.Style methods. Add examples for element_create() in the documentation.

.. date: 2023-10-27-09-56-20 .. gh-issue: 111388 .. nonce: SlmDbC .. section: Library

Add show_group parameter to :func:traceback.format_exception_only, which allows to format :exc:ExceptionGroup instances.

.. date: 2023-10-25-11-54-00 .. gh-issue: 79033 .. nonce: 5ePgFl .. section: Library

Another attempt at fixing :func:asyncio.Server.wait_closed. It now blocks until both conditions are true: the server is closed, and there are no more active connections. (This means that in some cases where in 3.12.0 this function would incorrectly have returned immediately, it will now block; in particular, when there are no active connections but the server hasn't been closed yet.)

.. date: 2023-10-25-11-13-35 .. gh-issue: 111259 .. nonce: z7ndeA .. section: Library

Optimize recursive wildcards in :mod:pathlib.

.. date: 2023-10-25-08-42-05 .. gh-issue: 111295 .. nonce: H2K4lf .. section: Library

Fix :mod:time not checking for errors when initializing.

.. date: 2023-10-24-12-20-46 .. gh-issue: 111253 .. nonce: HFywSK .. section: Library

Add error checking during :mod:!_socket module init.

.. date: 2023-10-24-12-09-46 .. gh-issue: 111251 .. nonce: urFYtn .. section: Library

Fix :mod:!_blake2 not checking for errors when initializing.

.. date: 2023-10-23-23-14-54 .. gh-issue: 111233 .. nonce: sCdCC0 .. section: Library

Fix :mod:select not checking for errors when initializing.

.. date: 2023-10-23-22-40-47 .. gh-issue: 111230 .. nonce: k3Jm84 .. section: Library

Fix :mod:ssl not checking for errors when initializing.

.. date: 2023-10-23-13-53-58 .. gh-issue: 111174 .. nonce: Oohmzd .. section: Library

Fix crash in :meth:io.BytesIO.getbuffer called repeatedly for empty BytesIO.

.. date: 2023-10-22-21-28-05 .. gh-issue: 111187 .. nonce: _W11Ab .. section: Library

Postpone removal version for locale.getdefaultlocale() to Python 3.15.

.. date: 2023-10-21-13-57-06 .. gh-issue: 111159 .. nonce: GoHp7s .. section: Library

Fix :mod:doctest output comparison for exceptions with notes.

.. date: 2023-10-20-15-29-10 .. gh-issue: 110910 .. nonce: u2oPwX .. section: Library

Fix invalid state handling in :class:asyncio.TaskGroup and :class:asyncio.Timeout. They now raise proper RuntimeError if they are improperly used and are left in consistent state after this.

.. date: 2023-10-19-22-46-34 .. gh-issue: 111092 .. nonce: hgut12 .. section: Library

Make turtledemo run without default root enabled.

.. date: 2023-10-16-18-41-51 .. gh-issue: 110944 .. nonce: CmUKXo .. section: Library

Support alias and convenience vars for :mod:pdb completion

.. date: 2023-10-15-08-08-26 .. gh-issue: 110745 .. nonce: mxEkh0 .. section: Library

Added newline parameter to :meth:pathlib.Path.read_text. Patch by Junya Okabe.

.. date: 2023-10-14-21-33-57 .. gh-issue: 84583 .. nonce: -Cmn4_ .. section: Library

Make :mod:pdb enter post-mortem mode even for :exc:SyntaxError

.. date: 2023-10-14-20-15-53 .. gh-issue: 80675 .. nonce: _M-cQC .. section: Library

Set f_trace_lines = True on all frames upon :func:pdb.set_trace

.. date: 2023-10-13-06-47-20 .. gh-issue: 110771 .. nonce: opwdlc .. section: Library

Expose the setup and cleanup portions of asyncio.run_forever() as the standalone methods asyncio.run_forever_setup() and asyncio.run_forever_cleanup(). This allows for tighter integration with GUI event loops.

.. date: 2023-10-12-15-16-44 .. gh-issue: 110774 .. nonce: AdCb5A .. section: Library

Support setting the :class:asyncio.Runner loop_factory kwarg in :class:unittest.IsolatedAsyncioTestCase

.. date: 2023-10-10-17-56-41 .. gh-issue: 110392 .. nonce: 6g6CnP .. section: Library

Fix :func:tty.setraw and :func:tty.setcbreak: previously they returned partially modified list of the original tty attributes. :func:tty.cfmakeraw and :func:tty.cfmakecbreak now make a copy of the list of special characters before modifying it.

.. date: 2023-10-09-23-59-04 .. gh-issue: 59013 .. nonce: qPbS-G .. section: Library

Make line number of function breakpoint more precise in :mod:pdb

.. date: 2023-10-08-18-38-09 .. gh-issue: 88434 .. nonce: 2Q_IkG .. section: Library

Emit deprecation warning for non-integer numbers in :mod:gettext functions and methods that consider plural forms even if the translation was not found.

.. date: 2023-10-08-14-17-06 .. gh-issue: 110395 .. nonce: _tdCsV .. section: Library

Ensure that :func:select.kqueue objects correctly appear as closed in forked children, to prevent operations on an invalid file descriptor.

.. date: 2023-10-02-05-23-27 .. gh-issue: 110196 .. nonce: djwt0z .. section: Library

Add __reduce__ method to :class:IPv6Address in order to keep scope_id

.. date: 2023-09-25-20-05-41 .. gh-issue: 109747 .. nonce: _cRJH8 .. section: Library

Improve errors for unsupported look-behind patterns. Now re.error is raised instead of OverflowError or RuntimeError for too large width of look-behind pattern.

.. date: 2023-09-15-12-30-21 .. gh-issue: 109466 .. nonce: 6ah-aw .. section: Library

Add the :attr:ipaddress.IPv4Address.ipv6_mapped property, which returns the IPv4-mapped IPv6 address.

.. date: 2023-09-08-12-10-10 .. gh-issue: 85098 .. nonce: DfQbeJ .. section: Library

Implement the CLI of the :mod:symtable module and improve the repr of :class:~symtable.Symbol.

.. date: 2023-09-02-16-07-23 .. gh-issue: 108791 .. nonce: fBcAqh .. section: Library

Improved error handling in :mod:pdb command line interface, making it produce more concise error messages.

.. date: 2023-08-30-19-10-35 .. gh-issue: 105931 .. nonce: Lpwve8 .. section: Library

Change :mod:compileall to only strip the stripdir prefix from the full path recorded in the compiled .pyc file, when the prefix matches the start of the full path in its entirety. When the prefix does not match, no stripping is performed and a warning to this effect is displayed.

Previously all path components of the stripdir prefix that matched the full path were removed, while those that did not match were left alone (including ones interspersed between matching components).

.. date: 2023-07-29-19-00-39 .. gh-issue: 107431 .. nonce: 1GzJ2p .. section: Library

Make the DictProxy and ListProxy types in :mod:multiprocessing.managers :ref:Generic Alias Types<types-genericalias> for [] use in typing contexts.

.. date: 2023-07-13-00-24-52 .. gh-issue: 72904 .. nonce: Yn5-j0 .. section: Library

Add :func:glob.translate. This function converts a pathname with shell-style wildcards to a regular expression.

.. date: 2023-05-30-02-01-14 .. gh-issue: 90026 .. nonce: FyCXw8 .. section: Library

Define USE_XATTRS on Cygwin so that XATTR-related functions in the :mod:os module become available.

.. date: 2023-04-26-16-37-00 .. gh-issue: 90890 .. nonce: fIag4w .. section: Library

New methods :meth:mailbox.Maildir.get_info, :meth:mailbox.Maildir.set_info, :meth:mailbox.Maildir.get_flags, :meth:mailbox.Maildir.set_flags, :meth:mailbox.Maildir.add_flag, :meth:mailbox.Maildir.remove_flag. These methods speed up accessing a message's info and/or flags and are useful when it is not necessary to access the message's contents, as when iterating over a Maildir to find messages with specific flags.

.. date: 2023-04-15-14-45-21 .. gh-issue: 102956 .. nonce: Z6qeUy .. section: Library

Fix returning of empty byte strings after seek in zipfile module

.. date: 2023-03-22-02-01-30 .. gh-issue: 102895 .. nonce: HiEqaZ .. section: Library

Added a parameter local_exit for :func:code.interact to prevent exit() and quit from closing sys.stdin and raise SystemExit.

.. date: 2022-10-14-21-11-10 .. gh-issue: 97928 .. nonce: Pdxh1G .. section: Library

Change the behavior of :meth:tkinter.Text.count. It now always returns an integer if one or less counting options are specified. Previously it could return a single count as a 1-tuple, an integer (only if option "update" was specified) or None if no items found. The result is now the same if wantobjects is set to 0.

.. date: 2022-10-05-15-01-36 .. gh-issue: 96954 .. nonce: ezwkrU .. section: Library

Switch the storage of the unicode codepoint names to use a different data-structure, a directed acyclic word graph <https://en.wikipedia.org/wiki/Deterministic_acyclic_finite_state_automaton>_. This makes the unicodedata shared library about 440 KiB smaller. Contributed by Carl Friedrich Bolz-Tereick using code from the PyPy project.

.. date: 2022-05-28-20-55-07 .. gh-issue: 73561 .. nonce: YRmAvy .. section: Library

Omit the interface scope from an IPv6 address when used as Host header by :mod:http.client.

.. date: 2022-05-06-15-49-57 .. gh-issue: 86826 .. nonce: rf006W .. section: Library

:mod:zipinfo now supports the full range of values in the TZ string determined by RFC 8536 and detects all invalid formats. Both Python and C implementations now raise exceptions of the same type on invalid data.

.. date: 2023-11-17-15-20-41 .. gh-issue: 111808 .. nonce: jtIayt .. section: Tests

Make the default value of test.support.infinite_recursion() to be conditional based on whether optimizations were used when compiling the interpreter. This helps with platforms like WASI whose stack size is greatly restricted in debug builds.

.. date: 2023-11-03-18-59-13 .. gh-issue: 110722 .. nonce: jvT1pb .. section: Tests

Gathering line coverage of standard libraries within the regression test suite is now precise, as well as much faster. Patch by Łukasz Langa.

.. date: 2023-10-31-22-09-25 .. gh-issue: 110367 .. nonce: UhQi44 .. section: Tests

Make regrtest --verbose3 option compatible with --huntrleaks -jN options. The ./python -m test -j1 -R 3:3 --verbose3 command now works as expected. Patch by Victor Stinner.

.. date: 2023-10-21-19-27-36 .. gh-issue: 111165 .. nonce: FU6mUk .. section: Tests

Remove no longer used functions run_unittest() and run_doctest() from the :mod:test.support module.

.. date: 2023-10-21-00-10-36 .. gh-issue: 110932 .. nonce: jktjJU .. section: Tests

Fix regrtest if the SOURCE_DATE_EPOCH environment variable is defined: use the variable value as the random seed. Patch by Victor Stinner.

.. date: 2023-10-17-17-54-36 .. gh-issue: 110995 .. nonce: Fx8KRD .. section: Tests

test_gdb: Fix detection of gdb built without Python scripting support. Patch by Victor Stinner.

.. date: 2023-10-16-13-47-24 .. gh-issue: 110918 .. nonce: aFgZK3 .. section: Tests

Test case matching patterns specified by options --match, --ignore, --matchfile and --ignorefile are now tested in the order of specification, and the last match determines whether the test case be run or ignored.

.. date: 2023-09-15-15-00-14 .. gh-issue: 108747 .. nonce: ql0owS .. section: Tests

Add unit test for usercustomize and sitecustomize hooks from :class:site.

.. date: 2023-11-15-16-56-20 .. gh-issue: 96954 .. nonce: 6FYvKn .. section: Build

Make make regen-unicodedata work for out-of-tree builds of CPython.

.. date: 2023-11-15-13-40-29 .. gh-issue: 112088 .. nonce: UJQxxh .. section: Build

Add Tools/build/regen-configure.sh script to regenerate the configure with an Ubuntu container image. The quay.io/tiran/cpython_autoconf:271 container image (tiran/cpython_autoconf <https://github.com/tiran/cpython_autoconf>_) is no longer used. Patch by Victor Stinner.

.. date: 2023-10-20-15-29-31 .. gh-issue: 111046 .. nonce: 2DxQl8 .. section: Build

For wasi-threads, memory is now exported to fix compatibility issues with some wasm runtimes.

.. date: 2023-10-17-03-10-40 .. gh-issue: 110828 .. nonce: 31vQ9B .. section: Build

AIX 32bit needs -latomic to build the :mod:!_testcapi extension module.

.. date: 2023-10-17-01-56-11 .. gh-issue: 85283 .. nonce: V156T2 .. section: Build

The errno, md5, resource, winsound, _ctypes_test, _multiprocessing.posixshmem, _scproxy, _stat, _testimportmultiple and _uuid C extensions are now built with the :ref:limited C API <limited-c-api>. Patch by Victor Stinner.

.. date: 2023-11-13-22-35-27 .. gh-issue: 111856 .. nonce: vEtA5z .. section: Windows

Fixes :func:~os.fstat on file systems that do not support file ID requests. This includes FAT32 and exFAT.

.. date: 2023-10-25-05-01-28 .. gh-issue: 111293 .. nonce: FSsLT6 .. section: Windows

Fix :data:os.DirEntry.inode dropping higher 64 bits of a file id on some filesystems on Windows.

.. date: 2023-10-19-21-46-18 .. gh-issue: 110913 .. nonce: CWlPfg .. section: Windows

WindowsConsoleIO now correctly chunks large buffers without splitting up UTF-8 sequences.

.. date: 2023-10-31-22-13-05 .. gh-issue: 59703 .. nonce: SML6Ag .. section: macOS

For macOS framework builds, in getpath.c use the system dladdr function to find the path to the shared library rather than depending on deprecated macOS APIs.

.. date: 2023-10-18-17-26-36 .. gh-issue: 110950 .. nonce: sonoma .. section: macOS

Update macOS installer to include an upstream Tcl/Tk fix for the Secure coding is not enabled for restorable state! warning encountered in Tkinter on macOS 14 Sonoma.

.. date: 2023-10-18-01-40-36 .. gh-issue: 111015 .. nonce: NaLI2L .. section: macOS

Ensure that IDLE.app and Python Launcher.app are installed with appropriate permissions on macOS builds.

.. date: 2023-09-02-08-49-57 .. gh-issue: 71383 .. nonce: Ttkchg .. section: macOS

Update macOS installer to include an upstream Tcl/Tk fix for the ttk::ThemeChanged error encountered in Tkinter.

.. date: 2023-08-30-16-33-57 .. gh-issue: 92603 .. nonce: ATkKVO .. section: macOS

Update macOS installer to include a fix accepted by upstream Tcl/Tk for a crash encountered after the first :meth:tkinter.Tk instance is destroyed.

.. bpo: 35668 .. date: 2019-01-07-06-18-25 .. nonce: JimxP5 .. section: IDLE

Add docstrings to the IDLE debugger module. Fix two bugs: initialize Idb.botframe (should be in Bdb); in Idb.in_rpc_code, check whether prev_frame is None before trying to use it. Greatly expand test_debugger.

.. date: 2023-11-09-13-04-29 .. gh-issue: 111903 .. nonce: 7Prryr .. section: Tools/Demos

Argument Clinic now supports the @critical_section directive that instructs Argument Clinic to generate a critical section around the function call, which locks the self object in --disable-gil builds. Patch by Sam Gross.

.. date: 2023-11-15-18-36-21 .. gh-issue: 112026 .. nonce: _Yybr5 .. section: C API

Add again the private _PyThreadState_UncheckedGet() function as an alias to the new public :c:func:PyThreadState_GetUnchecked function. Patch by Victor Stinner.

.. date: 2023-11-15-17-10-09 .. gh-issue: 112026 .. nonce: ts9yyn .. section: C API

Restore the removed _PyDict_GetItemStringWithError() function. It is used by numpy. Patch by Victor Stinner.

.. date: 2023-11-15-16-07-57 .. gh-issue: 112026 .. nonce: bnr8dd .. section: C API

Restore removed private C API functions, macros and structures which have no simple replacement for now:

_PyDict_GetItem_KnownHash()
_PyDict_NewPresized()
_PyHASH_BITS
_PyHASH_IMAG
_PyHASH_INF
_PyHASH_MODULUS
_PyHASH_MULTIPLIER
_PyLong_Copy()
_PyLong_FromDigits()
_PyLong_New()
_PyLong_Sign()
_PyObject_CallMethodId()
_PyObject_CallMethodNoArgs()
_PyObject_CallMethodOneArg()
_PyObject_CallOneArg()
_PyObject_EXTRA_INIT
_PyObject_FastCallDict()
_PyObject_GetAttrId()
_PyObject_Vectorcall()
_PyObject_VectorcallMethod()
_PyStack_AsDict()
_PyThread_CurrentFrames()
_PyUnicodeWriter structure
_PyUnicodeWriter_Dealloc()
_PyUnicodeWriter_Finish()
_PyUnicodeWriter_Init()
_PyUnicodeWriter_Prepare()
_PyUnicodeWriter_PrepareKind()
_PyUnicodeWriter_WriteASCIIString()
_PyUnicodeWriter_WriteChar()
_PyUnicodeWriter_WriteLatin1String()
_PyUnicodeWriter_WriteStr()
_PyUnicodeWriter_WriteSubstring()
_PyUnicode_AsString()
_PyUnicode_FromId()
_PyVectorcall_Function()
_Py_IDENTIFIER()
_Py_c_abs()
_Py_c_diff()
_Py_c_neg()
_Py_c_pow()
_Py_c_prod()
_Py_c_quot()
_Py_c_sum()
_Py_static_string()
_Py_static_string_init()

Patch by Victor Stinner.

.. date: 2023-11-13-17-57-11 .. gh-issue: 112026 .. nonce: WJLJcI .. section: C API

Add again <ctype.h> and <unistd.h> includes in Python.h, but don't include them in the limited C API version 3.13 and newer. Patch by Victor Stinner.

.. date: 2023-11-10-10-24-28 .. gh-issue: 111956 .. nonce: ImE6Cx .. section: C API

Add internal-only one-time initialization API: _PyOnceFlag and _PyOnceFlag_CallOnce.

.. date: 2023-11-10-10-21-38 .. gh-issue: 111262 .. nonce: 2utB5m .. section: C API

Add :c:func:PyDict_Pop and :c:func:PyDict_PopString functions: remove a key from a dictionary and optionally return the removed value. This is similar to :meth:dict.pop, but without the default value and not raising :exc:KeyError if the key missing. Patch by Stefan Behnel and Victor Stinner.

.. date: 2023-11-08-20-28-03 .. gh-issue: 111863 .. nonce: RPeFAX .. section: C API

Rename Py_NOGIL to Py_GIL_DISABLED. Patch by Hugo van Kemenade.

.. date: 2023-11-08-18-37-19 .. gh-issue: 111138 .. nonce: 3Ypq8h .. section: C API

Add :c:func:PyList_Extend and :c:func:PyList_Clear functions: similar to Python list.extend() and list.clear() methods. Patch by Victor Stinner.

.. date: 2023-10-31-18-22-03 .. gh-issue: 108765 .. nonce: _beYv8 .. section: C API

On Windows, Python.h no longer includes the <stddef.h> standard header file. If needed, it should now be included explicitly. Patch by Victor Stinner.

.. date: 2023-10-31-14-58-17 .. gh-issue: 111569 .. nonce: _V8iu4 .. section: C API

Implement "Python Critical Sections" from :pep:703. These are macros to help replace the GIL with per-object locks in the --disable-gil build of CPython. The macros are no-ops in the default build.

.. date: 2023-10-30-18-13-01 .. gh-issue: 111506 .. nonce: EUdO22 .. section: C API

In the limited C API version 3.13, :c:func:Py_SET_REFCNT function is now implemented as an opaque function call. Patch by Victor Stinner.

.. date: 2023-10-19-22-39-24 .. gh-issue: 108082 .. nonce: uJytvc .. section: C API

Add :c:func:PyErr_FormatUnraisable function.

.. date: 2023-10-17-10-21-59 .. gh-issue: 110964 .. nonce: OxqEjd .. section: C API

Move the undocumented private _PyArg functions and _PyArg_Parser structure to internal C API (pycore_modsupport.h). Patch by Victor Stinner.

.. date: 2023-10-13-14-18-06 .. gh-issue: 110815 .. nonce: tEFLVl .. section: C API

Support non-ASCII keyword names in :c:func:PyArg_ParseTupleAndKeywords.

.. date: 2023-10-02-23-08-53 .. gh-issue: 109587 .. nonce: UqqnDY .. section: C API

Introduced :c:func:PyUnstable_PerfTrampoline_CompileCode, :c:func:PyUnstable_PerfTrampoline_SetPersistAfterFork and :c:func:PyUnstable_CopyPerfMapFile. These functions allow extension modules to initialize trampolines eagerly, after the application is "warmed up". This makes it possible to have perf-trampolines running in an always-enabled fashion.

.. date: 2023-08-28-17-40-51 .. gh-issue: 85283 .. nonce: raFNiD .. section: C API

Add the :c:func:PySys_Audit function to the limited C API. Patch by Victor Stinner.

.. date: 2023-08-28-17-34-10 .. gh-issue: 85283 .. nonce: f1zXcc .. section: C API

Add :c:func:PyMem_RawMalloc, :c:func:PyMem_RawCalloc, :c:func:PyMem_RawRealloc and :c:func:PyMem_RawFree to the limited C API. Patch by Victor Stinner.

.. date: 2023-07-12-12-14-52 .. gh-issue: 106672 .. nonce: fkRjmi .. section: C API

Functions :c:func:PyDict_GetItem, :c:func:PyDict_GetItemString, :c:func:PyMapping_HasKey, :c:func:PyMapping_HasKeyString, :c:func:PyObject_HasAttr, :c:func:PyObject_HasAttrString, and :c:func:PySys_GetObject, which clear all errors occurred during calling the function, report now them using :func:sys.unraisablehook.

.. date: 2023-06-08-21-12-44 .. gh-issue: 67565 .. nonce: UkK3x- .. section: C API

Remove redundant C-contiguity check in :file:getargs.c, :mod:binascii, :mod:ssl and Argument Clinic. Patched by Stefan Krah and Furkan Onder