文档

• gh-111699 [https://github.com/python/cpython/issues/111699]: Relocate smtpd deprecation notice to its own section rather than under locale in What's New in Python 3.12 document

• gh-110746 [https://github.com/python/cpython/issues/110746]: Improved markup for valid options/values for methods ttk.treeview.column and ttk.treeview.heading, and for Layouts.

• gh-95649 [https://github.com/python/cpython/issues/95649]: Document that the asyncio module contains code taken from v0.16.0 of the uvloop project [https://github.com/MagicStack/uvloop/tree/v0.16.0], as well as the required MIT licensing information.

测试

• gh-111798 [https://github.com/python/cpython/issues/111798]: Disable test_super_deep() from test_call under pydebug builds on WASI; the stack depth is too small to make the test useful.

• gh-111801 [https://github.com/python/cpython/issues/111801]: Lower the recursion limit in test_isinstance for test_infinitely_many_bases(). This prevents a stack overflow on a pydebug build of WASI.

• gh-111802 [https://github.com/python/cpython/issues/111802]: Specify a low recursion depth for test_bad_getattr() in test.pickletester to avoid exhausting the stack under a pydebug build for WASI.

• gh-44626 [https://github.com/python/cpython/issues/44626]: Fix os.path.isabs() incorrectly returning True when given a path that starts with exactly one (back)slash on Windows.

Fix pathlib.PureWindowsPath.is_absolute() incorrectly returning False for some paths beginning with two (back)slashes.

• gh-113633 [https://github.com/python/cpython/issues/113633]: Use module state for the _testcapi extension module.

• gh-109980 [https://github.com/python/cpython/issues/109980]: Fix test_tarfile_vs_tar in test_shutil for macOS, where system tar can include more information in the archive than shutil.make_archive.

• gh-112769 [https://github.com/python/cpython/issues/112769]: The tests now correctly compare zlib version when zlib.ZLIB_RUNTIME_VERSION contains non-integer suffixes. For example zlib-ng defines the version as 1.3.0.zlib-ng.

• gh-112334 [https://github.com/python/cpython/issues/112334]: Adds a regression test to verify that vfork() is used when expected by subprocess on vfork enabled POSIX systems (Linux).

• gh-108927 [https://github.com/python/cpython/issues/108927]: Fixed order dependence in running tests in the same process when a test that has submodules (e.g. test_importlib) follows a test that imports its submodule (e.g. test_importlib.util) and precedes a test (e.g. test_unittest or test_compileall) that uses that submodule.

• bpo-40648 [https://bugs.python.org/issue?@action=redirect&bpo=40648]: Test modes that file can get with chmod() on Windows.

构建

• gh-114013 [https://github.com/python/cpython/issues/114013]: Fix Tools/wasm/wasi.py to not include the path to python.wasm as part of HOSTRUNNER. The environment variable is meant to specify how to run the WASI host only, having python.wasm and relevant flags appended to the HOSTRUNNER. This fixes make test work.

• gh-113258 [https://github.com/python/cpython/issues/113258]: Changed the Windows build to write out generated frozen modules into the build tree instead of the source tree.

• gh-112305 [https://github.com/python/cpython/issues/112305]: Fixed the check-clean-src step performed on out of tree builds to detect errant $(srcdir)/Python/frozen_modules/*.h files and recommend appropriate source tree cleanup steps to get a working build again.

• gh-112536 [https://github.com/python/cpython/issues/112536]: Add support for thread sanitizer (TSAN)

• gh-112867 [https://github.com/python/cpython/issues/112867]: Fix the build for the case that WITH_PYMALLOC_RADIX_TREE=0 set.

• gh-103065 [https://github.com/python/cpython/issues/103065]: Introduce Tools/wasm/wasi.py to simplify doing a WASI build.

• bpo-11102 [https://bugs.python.org/issue?@action=redirect&bpo=11102]: The os.major(), os.makedev(), and os.minor() functions are now available on HP-UX v3.

• bpo-36351 [https://bugs.python.org/issue?@action=redirect&bpo=36351]: Do not set ipv6type when cross-compiling.

Windows

• gh-114096 [https://github.com/python/cpython/issues/114096]: Process privileges that are activated for creating directory junctions are now restored afterwards, avoiding behaviour changes in other parts of the program.

• gh-111877 [https://github.com/python/cpython/issues/111877]: os.stat() calls were returning incorrect time values for files that could not be accessed directly.

• gh-111973 [https://github.com/python/cpython/issues/111973]: Update Windows installer to use SQLite 3.44.2.

• gh-113009 [https://github.com/python/cpython/issues/113009]: multiprocessing: On Windows, fix a race condition in Process.terminate(): no longer set the returncode attribute to always call WaitForSingleObject() in Process.wait(). Previously, sometimes the process was still running after TerminateProcess() even if GetExitCodeProcess() is not STILL_ACTIVE. Patch by Victor Stinner.

• gh-86179 [https://github.com/python/cpython/issues/86179]: Fixes path calculations when launching Python on Windows through a symlink.

• gh-71383 [https://github.com/python/cpython/issues/71383]: Update Tcl/Tk in Windows installer to 8.6.13 with a patch to suppress incorrect ThemeChanged warnings.

• gh-111650 [https://github.com/python/cpython/issues/111650]: Ensures the Py_GIL_DISABLED preprocessor variable is defined in pyconfig.h so that extension modules written in C are able to use it.

• gh-112278 [https://github.com/python/cpython/issues/112278]: Reduce the time cost for some functions in platform on Windows if current user has no permission to the WMI.

• gh-73427 [https://github.com/python/cpython/issues/73427]: Deprecate sys._enablelegacywindowsfsencoding(). Use PYTHONLEGACYWINDOWSFSENCODING instead. Patch by Inada Naoki.

• gh-87868 [https://github.com/python/cpython/issues/87868]: Correctly sort and remove duplicate environment variables in _winapi.CreateProcess().

• bpo-37308 [https://bugs.python.org/issue?@action=redirect&bpo=37308]: Fix mojibake in mmap.mmap when using a nonASCII tagname argument on Windows.

macOS

• gh-113666 [https://github.com/python/cpython/issues/113666]: Add the following constants to module stat: UF_SETTABLE, UF_TRACKED, UF_DATAVAULT, SF_SUPPORTED, SF_SETTABLE, SF_SYNTHETIC, SF_RESTRICTED, SF_FIRMLINK and SF_DATALESS. The values UF_SETTABLE, SF_SUPPORTED, SF_SETTABLE and SF_SYNTHETIC are only available on macOS.

• gh-113536 [https://github.com/python/cpython/issues/113536]: os.waitid() is now available on macOS

• gh-110459 [https://github.com/python/cpython/issues/110459]: Running configure … --with-openssl-rpath=X/Y/Z no longer fails to detect OpenSSL on macOS.

• gh-74573 [https://github.com/python/cpython/issues/74573]: Document that dbm.ndbm can silently corrupt DBM files on updates when exceeding undocumented platform limits, and can crash (segmentation fault) when reading such a corrupted file. (FB8919203)

• gh-65701 [https://github.com/python/cpython/issues/65701]: The freeze tool doesn't work with framework builds of Python. Document this and bail out early when running the tool with such a build.

• gh-87277 [https://github.com/python/cpython/issues/87277]: webbrowser: Don't look for X11 browsers on macOS. Those are generally not used and probing for them can result in starting XQuartz even if it isn't used otherwise.

• gh-111973 [https://github.com/python/cpython/issues/111973]: Update macOS installer to use SQLite 3.44.2.

• gh-108269 [https://github.com/python/cpython/issues/108269]: Set CFBundleAllowMixedLocalizations to true in the Info.plist for the framework, embedded Python.app and IDLE.app with framework installs on macOS. This allows applications to pick up the user's preferred locale when that's different from english.

• gh-102362 [https://github.com/python/cpython/issues/102362]: Make sure the result of sysconfig.get_plaform() includes at least a major and minor versions, even if MACOSX_DEPLOYMENT_TARGET is set to only a major version during build to match the format expected by pip.

• gh-110017 [https://github.com/python/cpython/issues/110017]: Disable a signal handling stress test on macOS due to a bug in macOS (FB13453490).

• gh-110820 [https://github.com/python/cpython/issues/110820]: Make sure the preprocessor definitions for ALIGNOF_MAX_ALIGN_T, SIZEOF_LONG_DOUBLE and HAVE_GCC_ASM_FOR_X64 are correct for Universal 2 builds on macOS.

• gh-109981 [https://github.com/python/cpython/issues/109981]: Use devfd on macOS to determine the number of open files in test.support.os_helper.fd_count to avoid a crash with "guarded" file descriptors when probing for open files.

IDLE

• gh-72284 [https://github.com/python/cpython/issues/72284]: Improve the lists of features, editor key bindings, and shell key bingings in the IDLE doc.

• gh-113903 [https://github.com/python/cpython/issues/113903]: Fix rare failure of test.test_idle, in test_configdialog.

• gh-113729 [https://github.com/python/cpython/issues/113729]: Fix the "Help -> IDLE Doc" menu bug in 3.11.7 and 3.12.1.

• gh-113269 [https://github.com/python/cpython/issues/113269]: Fix test_editor hang on macOS Catalina.

• gh-112898 [https://github.com/python/cpython/issues/112898]: Fix processing unsaved files when quitting IDLE on macOS.

• bpo-13586 [https://bugs.python.org/issue?@action=redirect&bpo=13586]: Enter the selected text when opening the "Replace" dialog.

C API

• gh-106560 [https://github.com/python/cpython/issues/106560]: Fix redundant declarations in the public C API. Declare PyBool_Type, PyLong_Type and PySys_Audit() only once. Patch by Victor Stinner.

• gh-112438 [https://github.com/python/cpython/issues/112438]: Fix support of format units "es", "et", "es#", and "et#" in nested tuples in PyArg_ParseTuple()-like functions.

• gh-111545 [https://github.com/python/cpython/issues/111545]: Add Py_HashPointer() function to hash a pointer. Patch by Victor Stinner.

• gh-65210 [https://github.com/python/cpython/issues/65210]: Change the declaration of the keywords parameter of PyArg_ParseTupleAndKeywords() and PyArg_VaParseTupleAndKeywords() for better compatibility with C++.

Python 3.13.0 alpha 2

Release date: 2023-11-22

核心与内置函数

• gh-112243 [https://github.com/python/cpython/issues/112243]: Don't include comments in fstring debug expressions. Patch by Pablo Galindo

• gh-112287 [https://github.com/python/cpython/issues/112287]: 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.

• gh-112266 [https://github.com/python/cpython/issues/112266]: Change docstrings of __dict__ and __weakref__.

• gh-111807 [https://github.com/python/cpython/issues/111807]: Lower the max parser stack depth to 1000 under WASI debug builds.

• gh-111798 [https://github.com/python/cpython/issues/111798]: 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.

• gh-106529 [https://github.com/python/cpython/issues/106529]: Enable translating unspecialized FOR_ITER to Tier 2.

• gh-111916 [https://github.com/python/cpython/issues/111916]: Make hashlib related modules threadsafe without the GIL

• gh-81137 [https://github.com/python/cpython/issues/81137]: 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).

• gh-79932 [https://github.com/python/cpython/issues/79932]: Raise exception if frame.clear() is called on a suspended frame.

• gh-81925 [https://github.com/python/cpython/issues/81925]: Implement native thread ids for GNU KFreeBSD.

• gh-111843 [https://github.com/python/cpython/issues/111843]: Use exponential backoff to reduce the number of failed tier 2 optimization attempts by over 99%.

• gh-110829 [https://github.com/python/cpython/issues/110829]: Joining a thread now ensures the underlying OS thread has exited. This is required for safer fork() in multithreaded processes.

• gh-109369 [https://github.com/python/cpython/issues/109369]: Make sure that tier 2 traces are deoptimized if the code is instrumented

• gh-111772 [https://github.com/python/cpython/issues/111772]: Specialize slot loads and stores for PyT_OBJECT as well as Py_T_OBJECT_EX

• gh-111666 [https://github.com/python/cpython/issues/111666]: Speed up BaseExceptionGroup.derive(), BaseExceptionGroup.subgroup(), and BaseExceptionGroup.split() by changing how they parse passed arguments.

• gh-111654 [https://github.com/python/cpython/issues/111654]: Fix runtime crash when some error happens in opcode LOAD_FROM_DICT_OR_DEREF.

• gh-111623 [https://github.com/python/cpython/issues/111623]: Add support for sharing tuples between interpreters using the cross-interpreter API. Patch by Anthony Shaw.

• gh-111354 [https://github.com/python/cpython/issues/111354]: The oparg of YIELD_VALUE is now 1 if the instruction is part of a yieldfrom or await, and 0 otherwise.

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

• gh-111520 [https://github.com/python/cpython/issues/111520]: Merge the Tier 1 (bytecode) and Tier 2 (microops) interpreters together, moving the Tier 2 interpreter loop and switch into PyEvalEvalFrameDefault() 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 microops and their debugging to PYTHON_UOPS and PYTHON_LLTRACE.

• gh-109181 [https://github.com/python/cpython/issues/109181]: Speed up Traceback object creation by lazily compute the line number. Patch by Pablo Galindo

• gh-111420 [https://github.com/python/cpython/issues/111420]: Allow type comments in parenthesized with statements

• gh-111438 [https://github.com/python/cpython/issues/111438]: Add support for sharing floats between interpreters using the cross-interpreter API. Patch by Anthony Shaw.

• gh-111435 [https://github.com/python/cpython/issues/111435]: Add support for sharing of True and False between interpreters using the cross-interpreter API. Patch by Anthony Shaw.

• gh-102388 [https://github.com/python/cpython/issues/102388]: Fix a bug where iso2022_jp_3 and iso2022_jp_2004 codecs read out of bounds

• gh-111366 [https://github.com/python/cpython/issues/111366]: Fix an issue in the codeop that was causing SyntaxError exceptions raised in the presence of invalid syntax to not contain precise error messages. Patch by Pablo Galindo

• gh-111380 [https://github.com/python/cpython/issues/111380]: Fix a bug that was causing SyntaxWarning to appear twice when parsing if invalid syntax is encountered later. Patch by Pablo galindo

• gh-111374 [https://github.com/python/cpython/issues/111374]: Added a new environment variable PYTHON_FROZEN_MODULES. It determines whether or not frozen modules are ignored by the import machinery, equivalent of the -X frozen_modules commandline option.

• gh-111354 [https://github.com/python/cpython/issues/111354]: Remove oparg from YIELD_VALUE. Change oparg of RESUME to include information about the except-depth. These changes make it possible to simplify the code in generator close.

• gh-94438 [https://github.com/python/cpython/issues/94438]: Fix a regression that prevented jumping across is None and is not None when debugging. Patch by Savannah Ostrowski.

• gh-67224 [https://github.com/python/cpython/issues/67224]: Show source lines in tracebacks when using the -c option when running Python. Patch by Pablo Galindo

• gh-111123 [https://github.com/python/cpython/issues/111123]: Fix a bug where a global declaration in an except block is rejected when the global is used in the else block.

• gh-110938 [https://github.com/python/cpython/issues/110938]: Fix error messages for indented blocks with functions and classes with generic type parameters. Patch by Pablo Galindo

• gh-109214 [https://github.com/python/cpython/issues/109214]: Remove unnecessary instruction pointer updates before returning from frames.

• gh-110912 [https://github.com/python/cpython/issues/110912]: Correctly display the traceback for MemoryError exceptions using the traceback module. Patch by Pablo Galindo

• gh-109894 [https://github.com/python/cpython/issues/109894]: Fixed crash due to improperly initialized static MemoryError in subinterpreter.

• gh-110892 [https://github.com/python/cpython/issues/110892]: Return NULL for PyTrace_RETURN events caused by an exception

• gh-110864 [https://github.com/python/cpython/issues/110864]: Fix argument parsing by PyArgUnpackKeywordsWithVararg for functions defining pos-or-keyword, vararg, and kw-only parameters.

• gh-109094 [https://github.com/python/cpython/issues/109094]: 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).

• gh-110805 [https://github.com/python/cpython/issues/110805]: Allow the repl to show source code and complete tracebacks. Patch by Pablo Galindo

• gh-110722 [https://github.com/python/cpython/issues/110722]: Add PYTHON_PRESITE=package.module to import a module early in the interpreter lifecycle before site.py is executed. Python needs to be built in debug mode for this option to exist.

• gh-110481 [https://github.com/python/cpython/issues/110481]: Implement biased reference counting in --disable-gil builds.

• gh-110543 [https://github.com/python/cpython/issues/110543]: Fix regression in Python 3.12 where 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.

• gh-89519 [https://github.com/python/cpython/issues/89519]: Removed chained classmethod descriptors (introduced in bpo-19072 [https://bugs.python.org/issue?@action=redirect&bpo=19072]). This can no longer be used to wrap other descriptors such as property. The core design of this feature was flawed and caused a number of downstream problems. To "pass-through" a classmethod, consider using the __wrapped__ attribute that was added in Python 3.10.

• gh-103615 [https://github.com/python/cpython/issues/103615]: Use local events for opcode tracing

• bpo-46657 [https://bugs.python.org/issue?@action=redirect&bpo=46657]: Add mimalloc memory allocator support.

• gh-106718 [https://github.com/python/cpython/issues/106718]: When PyConfig.stdlib_dir is explicitly set, it's now respected and won't be overridden by PyConfig.home.

• gh-106905 [https://github.com/python/cpython/issues/106905]: Fix incorrect SystemError about AST constructor recursion depth mismatch.

• gh-100445 [https://github.com/python/cpython/issues/100445]: Improve error message for unterminated strings with escapes.

• bpo-45759 [https://bugs.python.org/issue?@action=redirect&bpo=45759]: Improved error messages for elif/else statements not matching any valid statements. Patch by Jeremiah Vivian.

库

• gh-111942 [https://github.com/python/cpython/issues/111942]: Fix SystemError in the TextIOWrapper constructor with non-encodable "errors" argument in non-debug mode.

• gh-111995 [https://github.com/python/cpython/issues/111995]: Added the NI_IDN constant to the socket module when present in C at build time for use with socket.getnameinfo().

• gh-109538 [https://github.com/python/cpython/issues/109538]: Issue warning message instead of having RuntimeError be displayed when event loop has already been closed at StreamWriter.__del__().

• gh-111942 [https://github.com/python/cpython/issues/111942]: Fix crashes in io.TextIOWrapper.reconfigure() when pass invalid arguments, e.g. non-string encoding.

• gh-111460 [https://github.com/python/cpython/issues/111460]: curses: restore wide character support (including curses.unget_wch() and get_wch()) on macOS, which was unavailable due to a regression in Python 3.12.

• gh-103791 [https://github.com/python/cpython/issues/103791]: contextlib.suppress now supports suppressing exceptions raised as part of a BaseExceptionGroup, in addition to the recent support for ExceptionGroup.

• gh-111835 [https://github.com/python/cpython/issues/111835]: The mmap.mmap class now has an seekable() method that can be used when a seekable file-like object is required. The seek() method now returns the new absolute position. Patch by Donghee Na.

• gh-111804 [https://github.com/python/cpython/issues/111804]: Remove posix.fallocate() under WASI as the underlying posix_fallocate() is not available in WASI preview2.

• gh-111841 [https://github.com/python/cpython/issues/111841]: Fix truncating arguments on an embedded null character in os.putenv() and os.unsetenv() on Windows.

• gh-111768 [https://github.com/python/cpython/issues/111768]: wsgiref.util.is_hop_by_hop() is now exposed correctly in __all__.

• gh-80731 [https://github.com/python/cpython/issues/80731]: Avoid executing the default function in cmd.Cmd in an except block

• gh-111541 [https://github.com/python/cpython/issues/111541]: Fix doctest for SyntaxError not-builtin subclasses.

• gh-111719 [https://github.com/python/cpython/issues/111719]: Add extra argument validation for alias command in pdb

• gh-111482 [https://github.com/python/cpython/issues/111482]: time: Make time.clock_gettime() and time.clock_gettime_ns() functions up to 2x faster by faster calling convention. Patch by Victor Stinner.

• gh-110894 [https://github.com/python/cpython/issues/110894]: Call loop exception handler for exceptions in client_connected_cb of asyncio.start_server() so that applications can handle it. Patch by Kumar Aditya.

• gh-111531 [https://github.com/python/cpython/issues/111531]: Fix reference leaks in bind_class() and bind_all() methods of tkinter widgets.

• gh-111246 [https://github.com/python/cpython/issues/111246]: asyncio.loop.create_unix_server() will now automatically remove the Unix socket when the server is closed.

• gh-111356 [https://github.com/python/cpython/issues/111356]: Added io.text_encoding(), io.DEFAULT_BUFFER_SIZE, and io.IncrementalNewlineDecoder to io.__all__.

• gh-66425 [https://github.com/python/cpython/issues/66425]: 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.

• gh-111429 [https://github.com/python/cpython/issues/111429]: Speed up pathlib.PurePath.relative_to() and is_relative_to().

• gh-111342 [https://github.com/python/cpython/issues/111342]: Fixed typo in math.sumprod().

• gh-68166 [https://github.com/python/cpython/issues/68166]: Remove mention of not supported "vsapi" element type in tkinter.ttk.Style.element_create(). Add tests for element_create() and other ttk.Style methods. Add examples for element_create() in the documentation.

• gh-111388 [https://github.com/python/cpython/issues/111388]: Add show_group parameter to traceback.format_exception_only(), which allows to format ExceptionGroup instances.

• gh-79033 [https://github.com/python/cpython/issues/79033]: Another attempt at fixing 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.)

• gh-111259 [https://github.com/python/cpython/issues/111259]: Optimize recursive wildcards in pathlib.

• gh-111295 [https://github.com/python/cpython/issues/111295]: Fix time not checking for errors when initializing.

• gh-111253 [https://github.com/python/cpython/issues/111253]: Add error checking during _socket module init.

• gh-111251 [https://github.com/python/cpython/issues/111251]: Fix _blake2 not checking for errors when initializing.

• gh-111233 [https://github.com/python/cpython/issues/111233]: Fix select not checking for errors when initializing.

• gh-111230 [https://github.com/python/cpython/issues/111230]: Fix ssl not checking for errors when initializing.

• gh-111174 [https://github.com/python/cpython/issues/111174]: Fix crash in io.BytesIO.getbuffer() called repeatedly for empty BytesIO.

• gh-111187 [https://github.com/python/cpython/issues/111187]: Postpone removal version for locale.getdefaultlocale() to Python 3.15.

• gh-111159 [https://github.com/python/cpython/issues/111159]: Fix doctest output comparison for exceptions with notes.

• gh-110910 [https://github.com/python/cpython/issues/110910]: Fix invalid state handling in asyncio.TaskGroup and asyncio.Timeout. They now raise proper RuntimeError if they are improperly used and are left in consistent state after this.

• gh-111092 [https://github.com/python/cpython/issues/111092]: Make turtledemo run without default root enabled.

• gh-110944 [https://github.com/python/cpython/issues/110944]: Support alias and convenience vars for pdb completion

• gh-110745 [https://github.com/python/cpython/issues/110745]: Added newline parameter to pathlib.Path.read_text(). Patch by Junya Okabe.

• gh-84583 [https://github.com/python/cpython/issues/84583]: Make pdb enter post-mortem mode even for SyntaxError

• gh-80675 [https://github.com/python/cpython/issues/80675]: Set f_trace_lines = True on all frames upon pdb.set_trace()

• gh-110771 [https://github.com/python/cpython/issues/110771]: 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.

• gh-110774 [https://github.com/python/cpython/issues/110774]: Support setting the asyncio.Runner loop_factory kwarg in unittest.IsolatedAsyncioTestCase

• gh-110392 [https://github.com/python/cpython/issues/110392]: Fix tty.setraw() and tty.setcbreak(): previously they returned partially modified list of the original tty attributes. tty.cfmakeraw() and tty.cfmakecbreak() now make a copy of the list of special characters before modifying it.

• gh-59013 [https://github.com/python/cpython/issues/59013]: Make line number of function breakpoint more precise in pdb

• gh-88434 [https://github.com/python/cpython/issues/88434]: Emit deprecation warning for non-integer numbers in gettext functions and methods that consider plural forms even if the translation was not found.

• gh-110395 [https://github.com/python/cpython/issues/110395]: Ensure that select.kqueue() objects correctly appear as closed in forked children, to prevent operations on an invalid file descriptor.

• gh-110196 [https://github.com/python/cpython/issues/110196]: Add __reduce__ method to IPv6Address in order to keep scope_id

• gh-109747 [https://github.com/python/cpython/issues/109747]: Improve errors for unsupported lookbehind patterns. Now re.error is raised instead of OverflowError or RuntimeError for too large width of lookbehind pattern.

• gh-109466 [https://github.com/python/cpython/issues/109466]: Add the ipaddress.IPv4Address.ipv6_mapped property, which returns the IPv4-mapped IPv6 address.

• gh-85098 [https://github.com/python/cpython/issues/85098]: Implement the CLI of the symtable module and improve the repr of Symbol.

• gh-108791 [https://github.com/python/cpython/issues/108791]: Improved error handling in pdb command line interface, making it produce more concise error messages.

• gh-105931 [https://github.com/python/cpython/issues/105931]: Change 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).

• gh-107431 [https://github.com/python/cpython/issues/107431]: Make the DictProxy and ListProxy types in multiprocessing.managers Generic Alias Types for [] use in typing contexts.

• gh-72904 [https://github.com/python/cpython/issues/72904]: Add glob.translate(). This function converts a pathname with shell-style wildcards to a regular expression.

• gh-90026 [https://github.com/python/cpython/issues/90026]: Define USE_XATTRS on Cygwin so that XATTR-related functions in the os module become available.

• gh-90890 [https://github.com/python/cpython/issues/90890]: New methods mailbox.Maildir.get_info(), mailbox.Maildir.set_info(), mailbox.Maildir.get_flags(), mailbox.Maildir.set_flags(), mailbox.Maildir.add_flag(), 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.

• gh-102956 [https://github.com/python/cpython/issues/102956]: Fix returning of empty byte strings after seek in zipfile module

• gh-102895 [https://github.com/python/cpython/issues/102895]: Added a parameter local_exit for code.interact() to prevent exit() and quit from closing sys.stdin and raise SystemExit.

• gh-97928 [https://github.com/python/cpython/issues/97928]: Change the behavior of 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.

• gh-96954 [https://github.com/python/cpython/issues/96954]: 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.

• gh-73561 [https://github.com/python/cpython/issues/73561]: Omit the interface scope from an IPv6 address when used as Host header by http.client.

• gh-86826 [https://github.com/python/cpython/issues/86826]: 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.

测试

• gh-111808 [https://github.com/python/cpython/issues/111808]: 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.

• gh-110722 [https://github.com/python/cpython/issues/110722]: Gathering line coverage of standard libraries within the regression test suite is now precise, as well as much faster. Patch by Łukasz Langa.

• gh-110367 [https://github.com/python/cpython/issues/110367]: 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.

• gh-111165 [https://github.com/python/cpython/issues/111165]: Remove no longer used functions run_unittest() and run_doctest() from the test.support module.

• gh-110932 [https://github.com/python/cpython/issues/110932]: Fix regrtest if the SOURCE_DATE_EPOCH environment variable is defined: use the variable value as the random seed. Patch by Victor Stinner.

• gh-110995 [https://github.com/python/cpython/issues/110995]: test_gdb: Fix detection of gdb built without Python scripting support. Patch by Victor Stinner.

• gh-110918 [https://github.com/python/cpython/issues/110918]: 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.

• gh-108747 [https://github.com/python/cpython/issues/108747]: Add unit test for usercustomize and sitecustomize hooks from site.

构建

• gh-96954 [https://github.com/python/cpython/issues/96954]: Make make regen-unicodedata work for out-of-tree builds of CPython.

• gh-112088 [https://github.com/python/cpython/issues/112088]: 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.

• gh-111046 [https://github.com/python/cpython/issues/111046]: For wasi-threads, memory is now exported to fix compatibility issues with some wasm runtimes.

• gh-110828 [https://github.com/python/cpython/issues/110828]: AIX 32bit needs -latomic to build the _testcapi extension module.

• gh-85283 [https://github.com/python/cpython/issues/85283]: The errno, md5, resource, winsound, _ctypes_test, _multiprocessing.posixshmem, _scproxy, _stat, _testimportmultiple and _uuid C extensions are now built with the limited C API. Patch by Victor Stinner.

Windows

• gh-111856 [https://github.com/python/cpython/issues/111856]: Fixes fstat() on file systems that do not support file ID requests. This includes FAT32 and exFAT.

• gh-111293 [https://github.com/python/cpython/issues/111293]: Fix os.DirEntry.inode dropping higher 64 bits of a file id on some filesystems on Windows.

• gh-110913 [https://github.com/python/cpython/issues/110913]: WindowsConsoleIO now correctly chunks large buffers without splitting up UTF-8 sequences.

macOS

• gh-59703 [https://github.com/python/cpython/issues/59703]: 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.

• gh-110950 [https://github.com/python/cpython/issues/110950]: 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.

• gh-111015 [https://github.com/python/cpython/issues/111015]: Ensure that IDLE.app and Python Launcher.app are installed with appropriate permissions on macOS builds.

• gh-71383 [https://github.com/python/cpython/issues/71383]: Update macOS installer to include an upstream Tcl/Tk fix for the ttk::ThemeChanged error encountered in Tkinter.

• gh-92603 [https://github.com/python/cpython/issues/92603]: Update macOS installer to include a fix accepted by upstream Tcl/Tk for a crash encountered after the first tkinter.Tk() instance is destroyed.