文档

• gh-100616 [https://github.com/python/cpython/issues/100616]: Document existing attr parameter to curses.window.vline() function in curses.

• gh-100472 [https://github.com/python/cpython/issues/100472]: Remove claim in documentation that the stripdir, prependdir and limit_sl_dest parameters of compileall.compile_dir() and compileall.compile_file() could be bytes.

• bpo-25377 [https://bugs.python.org/issue?@action=redirect&bpo=25377]: Clarify use of octal format of mode argument in help(os.chmod) as well as help(os.fchmod)

测试

• gh-100454 [https://github.com/python/cpython/issues/100454]: Start running SSL tests with OpenSSL 3.1.0-beta1.

• gh-100086 [https://github.com/python/cpython/issues/100086]: The Python test runner (libregrtest) now logs Python build information like "debug" vs "release" build, or LTO and PGO optimizations. Patch by Victor Stinner.

• gh-93018 [https://github.com/python/cpython/issues/93018]: Make two tests forgiving towards host system libexpat with backported security fixes applied.

构建

• gh-100540 [https://github.com/python/cpython/issues/100540]: Removed the --with-system-ffi configure option; libffi must now always be supplied by the system on all non-Windows platforms. The option has had no effect on non-Darwin platforms for several releases, and in 3.11 only had the non-obvious effect of invoking pkg-config to find libffi and never setting -DUSING_APPLE_OS_LIBFFI. Now on Darwin platforms configure will first check for the OS libffi and then fall back to the same processing as other platforms if it is not found.

• gh-88267 [https://github.com/python/cpython/issues/88267]: Avoid exporting Python symbols in linked Windows applications when the core is built as static.

• bpo-41916 [https://bugs.python.org/issue?@action=redirect&bpo=41916]: Allow override of ac_cv_cxx_thread so that cross compiled python can set -pthread for CXX.

Windows

• gh-100180 [https://github.com/python/cpython/issues/100180]: Update Windows installer to OpenSSL 1.1.1s

• gh-99191 [https://github.com/python/cpython/issues/99191]: Use MSVCLANG >= 202002L instead of less-precise MSCVER >=1929 to more accurately test for C++20 support in PC/_wmimodule.cpp.

• gh-79218 [https://github.com/python/cpython/issues/79218]: Define MS_WIN64 for Mingw-w64 64bit, fix cython compilation failure.

• gh-99941 [https://github.com/python/cpython/issues/99941]: Ensure that asyncio.Protocol.data_received() receives an immutable bytes object (as documented), instead of bytearray.

• bpo-43984 [https://bugs.python.org/issue?@action=redirect&bpo=43984]: winreg.SetValueEx() now leaves the target value untouched in the case of conversion errors. Previously, -1 would be written in case of such errors.

• bpo-34816 [https://bugs.python.org/issue?@action=redirect&bpo=34816]: hasattr(ctypes.windll, 'nonexistant') now returns False instead of raising OSError.

macOS

• gh-100180 [https://github.com/python/cpython/issues/100180]: Update macOS installer to OpenSSL 1.1.1s

• gh-100540 [https://github.com/python/cpython/issues/100540]: Removed obsolete dlfcn.h shim from the _ctypes extension module, which has not been necessary since Mac OS X 10.2.

工具/示例

• bpo-45256 [https://bugs.python.org/issue?@action=redirect&bpo=45256]: Fix a bug that caused an AttributeError to be raised in python-gdb.py when py-locals is used without a frame.

• gh-100342 [https://github.com/python/cpython/issues/100342]: Add missing NULL check for possible allocation failure in *args parsing in Argument Clinic.

C API

• gh-99947 [https://github.com/python/cpython/issues/99947]: Raising SystemError on import will now have its cause be set to the original unexpected exception.

• gh-99240 [https://github.com/python/cpython/issues/99240]: In argument parsing, after deallocating newly allocated memory, reset its pointer to NULL.

• gh-98724 [https://github.com/python/cpython/issues/98724]: The Py_CLEAR, Py_SETREF and Py_XSETREF macros now only evaluate their arguments once. If an argument has side effects, these side effects are no longer duplicated. Patch by Victor Stinner.

Python 3.12.0 alpha 3

Release date: 2022-12-06

安全性

• gh-100001 [https://github.com/python/cpython/issues/100001]: python -m http.server no longer allows terminal control characters sent within a garbage request to be printed to the stderr server log.

This is done by changing the http.server BaseHTTPRequestHandler .log_message method to replace control characters with a \xHH hex escape before printing.

• gh-87604 [https://github.com/python/cpython/issues/87604]: Avoid publishing list of active per-interpreter audit hooks via the gc module

核心与内置函数

• gh-99891 [https://github.com/python/cpython/issues/99891]: Fix a bug in the tokenizer that could cause infinite recursion when showing syntax warnings that happen in the first line of the source. Patch by Pablo Galindo

• gh-91054 [https://github.com/python/cpython/issues/91054]: Add PyCode_AddWatcher() and PyCode_ClearWatcher() APIs to register callbacks to receive notification on creation and destruction of code objects.

• gh-99729 [https://github.com/python/cpython/issues/99729]: Fix an issue that could cause frames to be visible to Python code as they are being torn down, possibly leading to memory corruption or hard crashes of the interpreter.

• gh-99708 [https://github.com/python/cpython/issues/99708]: Fix bug where compiler crashes on an if expression with an empty body block.

• gh-99578 [https://github.com/python/cpython/issues/99578]: Fix a reference bug in imp.createbuiltin() after the creation of the first subinterpreter for modules builtins and sys. Patch by Victor Stinner.

• gh-99581 [https://github.com/python/cpython/issues/99581]: Fixed a bug that was causing a buffer overflow if the tokenizer copies a line missing the newline character from a file that is as long as the available tokenizer buffer. Patch by Pablo galindo

• gh-99553 [https://github.com/python/cpython/issues/99553]: Fix bug where an ExceptionGroup subclass can wrap a BaseException.

• gh-99547 [https://github.com/python/cpython/issues/99547]: Add a function to os.path to check if a path is a junction: isjunction. Add similar functionality to pathlib.Path as is_junction.

• gh-99370 [https://github.com/python/cpython/issues/99370]: Fix zip path for venv created from a non-installed python on POSIX platforms.

• gh-99377 [https://github.com/python/cpython/issues/99377]: Add audit events for thread creation and clear operations.

• gh-98686 [https://github.com/python/cpython/issues/98686]: Remove the BINARY_OP_GENERIC and COMPARE_OP_GENERIC "specializations".

• gh-99298 [https://github.com/python/cpython/issues/99298]: Remove the remaining error paths for attribute specializations, and refuse to specialize attribute accesses on types that haven't had PyType_Ready() called on them yet.

• gh-99127 [https://github.com/python/cpython/issues/99127]: Allow some features of syslog to the main interpreter only. Patch by Donghee Na.

• gh-91053 [https://github.com/python/cpython/issues/91053]: Optimizing interpreters and JIT compilers may need to invalidate internal metadata when functions are modified. This change adds the ability to provide a callback that will be invoked each time a function is created, modified, or destroyed.

• gh-90994 [https://github.com/python/cpython/issues/90994]: Improve error messages when there's a syntax error with call arguments. The following three cases are covered: - No value is assigned to a named argument, eg foo(a=). - A value is assigned to a star argument, eg foo(*args=[0]). - A value is assigned to a double-star keyword argument, eg foo(**kwarg={'a': 0}).

• bpo-45026 [https://bugs.python.org/issue?@action=redirect&bpo=45026]: Optimize the range object iterator. It is now smaller, faster iteration of ranges containing large numbers. Smaller pickles, faster unpickling.

• bpo-31718 [https://bugs.python.org/issue?@action=redirect&bpo=31718]: Raise ValueError instead of SystemError when methods of uninitialized io.IncrementalNewlineDecoder objects are called. Patch by Oren Milman.

• bpo-38031 [https://bugs.python.org/issue?@action=redirect&bpo=38031]: Fix a possible assertion failure in io.FileIO when the opener returns an invalid file descriptor.

库

• gh-100001 [https://github.com/python/cpython/issues/100001]: Also escape s in the http.server BaseHTTPRequestHandler.log_message so that it is technically possible to parse the line and reconstruct what the original data was. Without this a xHH is ambiguous as to if it is a hex replacement we put in or the characters r"x" came through in the original request line.

• gh-99957 [https://github.com/python/cpython/issues/99957]: Add frozen_default parameter to typing.dataclass_transform().

• gh-79033 [https://github.com/python/cpython/issues/79033]: Fix asyncio.Server.wait_closed() to actually do what the docs promise — wait for all existing connections to complete, after closing the server.

• gh-51524 [https://github.com/python/cpython/issues/51524]: Fix bug when calling trace.CoverageResults with valid infile.

• gh-99645 [https://github.com/python/cpython/issues/99645]: Fix a bug in handling class cleanups in unittest.TestCase. Now addClassCleanup() uses separate lists for different TestCase subclasses, and doClassCleanups() only cleans up the particular class.

• gh-99508 [https://github.com/python/cpython/issues/99508]: Fix TypeError in Lib/importlib/bootstrapexternal.py while calling imp.sourcehash().

• gh-66285 [https://github.com/python/cpython/issues/66285]: Fix asyncio to not share event loop and signal wakeupfd in forked processes. Patch by Kumar Aditya.

• gh-97001 [https://github.com/python/cpython/issues/97001]: Release the GIL when calling termios APIs to avoid blocking threads.

• gh-92647 [https://github.com/python/cpython/issues/92647]: Use final status of an enum to determine lookup or creation branch of functional API.

• gh-99388 [https://github.com/python/cpython/issues/99388]: Add loop_factory parameter to asyncio.run() to allow specifying a custom event loop factory. Patch by Kumar Aditya.

• gh-99341 [https://github.com/python/cpython/issues/99341]: Fix ast.increment_lineno() to also cover ast.TypeIgnore when changing line numbers.

• gh-99382 [https://github.com/python/cpython/issues/99382]: Check the number of arguments in substitution in user generics containing a TypeVarTuple and one or more TypeVar.

• gh-99379 [https://github.com/python/cpython/issues/99379]: Fix substitution of ParamSpec followed by TypeVarTuple in generic aliases.

• gh-99344 [https://github.com/python/cpython/issues/99344]: Fix substitution of TypeVarTuple and ParamSpec together in user generics.

• gh-99284 [https://github.com/python/cpython/issues/99284]: Remove usebroken_old_ctypes_structure_semantics_ old untested and undocumented hack from ctypes.

• gh-99201 [https://github.com/python/cpython/issues/99201]: Fix IndexError when initializing the config variables on Windows if HAVE_DYNAMIC_LOADING is not set.

• gh-99240 [https://github.com/python/cpython/issues/99240]: Fix double-free bug in Argument Clinic str_converter by extracting memory clean up to a new post_parsing section.

• gh-64490 [https://github.com/python/cpython/issues/64490]: Fix refcount error when arguments are packed to tuple in Argument Clinic.

• gh-99029 [https://github.com/python/cpython/issues/99029]: pathlib.PurePath.relative_to() now treats naked Windows drive paths as relative. This brings its behaviour in line with other parts of pathlib.

• gh-98253 [https://github.com/python/cpython/issues/98253]: The implementation of the typing module is now more resilient to reference leaks in binary extension modules.

Previously, a reference leak in a typed C API-based extension module could leak internals of the typing module, which could in turn introduce leaks in essentially any other package with typed function signatures. Although the typing package is not the original source of the problem, such nonlocal dependences exacerbate debugging of large-scale projects, and the implementation was therefore changed to reduce harm by providing better isolation.

• gh-98458 [https://github.com/python/cpython/issues/98458]: Fix infinite loop in unittest when a self-referencing chained exception is raised

• gh-93453 [https://github.com/python/cpython/issues/93453]: asyncio.get_event_loop() and many other asyncio functions like asyncio.ensure_future(), asyncio.shield() or asyncio.gather(), and also the get_event_loop() method of asyncio.BaseDefaultEventLoopPolicy now raise a RuntimeError if called when there is no running event loop and the current event loop was not set. Previously they implicitly created and set a new current event loop. DeprecationWarning is no longer emitted if there is no running event loop but the current event loop was set.

• gh-97966 [https://github.com/python/cpython/issues/97966]: On uname_result, restored expectation that _fields and _asdict would include all six properties including processor.

• gh-98248 [https://github.com/python/cpython/issues/98248]: Provide informative error messages in struct.pack() when its integral arguments are not in range.

• gh-98108 [https://github.com/python/cpython/issues/98108]: zipfile.Path is now pickleable if its initialization parameters were pickleable (e.g. for file system paths).

• gh-98098 [https://github.com/python/cpython/issues/98098]: Created packages from zipfile and test_zipfile modules, separating zipfile.Path functionality.

• gh-82836 [https://github.com/python/cpython/issues/82836]: Fix is_private properties in the ipaddress module. Previously non-private networks (0.0.0.0/0) would return True from this method; now they correctly return False.

• gh-96828 [https://github.com/python/cpython/issues/96828]: Add an OP_ENABLE_KTLS option for enabling the use of the kernel TLS (kTLS). Patch by Illia Volochii.

• gh-88863 [https://github.com/python/cpython/issues/88863]: To avoid apparent memory leaks when asyncio.open_connection() raises, break reference cycles generated by local exception and future instances (which has exception instance as its member var). Patch by Dong Uk, Kang.

• gh-91078 [https://github.com/python/cpython/issues/91078]: TarFile.next() now returns None when called on an empty tarfile.

• bpo-47220 [https://bugs.python.org/issue?@action=redirect&bpo=47220]: Document the optional callback parameter of WeakMethod. Patch by Géry Ogam.

• bpo-44817 [https://bugs.python.org/issue?@action=redirect&bpo=44817]: Ignore WinError 53 (ERROR_BAD_NETPATH), 65 (ERROR_NETWORK_ACCESS_DENIED) and 161 (ERROR_BAD_PATHNAME) when using ntpath.realpath().

• bpo-41260 [https://bugs.python.org/issue?@action=redirect&bpo=41260]: Rename the fmt parameter of the pure Python implementation of datetime.date.strftime() to format.

• bpo-15999 [https://bugs.python.org/issue?@action=redirect&bpo=15999]: All builtin functions now accept arguments of any type instead of just bool and int for boolean parameters.

文档

• gh-99931 [https://github.com/python/cpython/issues/99931]: Use sphinxext-opengraph [https://sphinxext-opengraph.readthedocs.io/] to generate OpenGraph metadata [https://ogp.me/].

• gh-89682 [https://github.com/python/cpython/issues/89682]: Reworded docstring of the default __contains__ to clarify that it returns a bool.

• gh-88330 [https://github.com/python/cpython/issues/88330]: Improved the description of what a resource is in importlib.resources docs.

• gh-92892 [https://github.com/python/cpython/issues/92892]: Document that calling variadic functions with ctypes requires special care on macOS/arm64 (and possibly other platforms).

• bpo-41825 [https://bugs.python.org/issue?@action=redirect&bpo=41825]: Restructured the documentation for the os.wait* family of functions, and improved the docs for os.waitid() with more explanation of the possible argument constants.

测试

• gh-99892 [https://github.com/python/cpython/issues/99892]: Skip test_normalization() of test_unicodedata if it fails to download NormalizationTest.txt file from pythontest.net. Patch by Victor Stinner.

• gh-99934 [https://github.com/python/cpython/issues/99934]: Correct test_marsh on (32 bit) x86: test_deterministic sets was failing.

• gh-99741 [https://github.com/python/cpython/issues/99741]: We've implemented multiphase init (PEP 489/630/687) for the internal (for testing) _xxsubinterpreters module.

• gh-99659 [https://github.com/python/cpython/issues/99659]: Optional big memory tests in test_sqlite3 now catch the correct sqlite.DataError exception type in case of too large strings and/or blobs passed.

• gh-99593 [https://github.com/python/cpython/issues/99593]: Cover the Unicode C API with tests.

• gh-96002 [https://github.com/python/cpython/issues/96002]: Add functional test for Argument Clinic.

构建

• gh-99086 [https://github.com/python/cpython/issues/99086]: Fix -Wimplicit-int, -Wstrict-prototypes, and -Wimplicit-function-declaration compiler warnings in configure checks.

• gh-99337 [https://github.com/python/cpython/issues/99337]: Fix a compilation issue with GCC 12 on macOS.

• gh-99289 [https://github.com/python/cpython/issues/99289]: Add a COMPILEALL_OPTS variable in Makefile to override compileall options (default: -j0) in make install. Also merged the compileall commands into a single command building .pyc files for the all optimization levels (0, 1, 2) at once. Patch by Victor Stinner.

• gh-98872 [https://github.com/python/cpython/issues/98872]: Fix a possible fd leak in Programs/freezemodule.c introduced in Python 3.11.

• gh-88226 [https://github.com/python/cpython/issues/88226]: Always define TARGET_* labels in Python/ceval.c, even if USE_COMPUTED_GOTOS is disabled. This allows breakpoints to be set at those labels in (for instance) gdb.

Windows

• gh-99345 [https://github.com/python/cpython/issues/99345]: Use faster initialization functions to detect install location for Windows Store package

• gh-98629 [https://github.com/python/cpython/issues/98629]: Fix initialization of sys.version and sys._git on Windows

• gh-99442 [https://github.com/python/cpython/issues/99442]: Fix handling in 适用于Windows的Python启动器 when argv[0] does not include a file extension.

• bpo-40882 [https://bugs.python.org/issue?@action=redirect&bpo=40882]: Fix a memory leak in multiprocessing.shared_memory.SharedMemory on Windows.

macOS

• gh-87235 [https://github.com/python/cpython/issues/87235]: On macOS python3 devfd/9 9 failed for any script longer than a couple of bytes.

• gh-98940 [https://github.com/python/cpython/issues/98940]: Fix Mac/Extras.install.py file filter bug.

工具/示例

• gh-64490 [https://github.com/python/cpython/issues/64490]: Argument Clinic varargs bugfixes

  • Fix out-of-bounds error in PyArgUnpackKeywordsWithVararg().

  • Fix incorrect check which allowed more than one varargs in clinic.py.

  • Fix miscalculation of noptargs in generated code.

  • Do not generate noptargs when there is a vararg argument and no optional argument.

C API

• gh-98680 [https://github.com/python/cpython/issues/98680]: PyBUF_* constants were marked as part of Limited API of Python 3.11+. These were available in 3.11.0 with Py_LIMITED_API defined for 3.11, and are necessary to use the buffer API.

• gh-99612 [https://github.com/python/cpython/issues/99612]: Fix PyUnicode_DecodeUTF8Stateful() for ASCII-only data: *consumed was not set.

• gh-47146 [https://github.com/python/cpython/issues/47146]: The structmember.h header is deprecated. Its non-deprecated contents are now available just by including Python.h, with a Py_ prefix added if it was missing. (Deprecated contents are T_OBJECT, T_NONE, and no-op flags.) Patch by Petr Viktorin, based on earlier work by Alexander Belopolsky and Matthias Braun.

Python 3.12.0 alpha 2

Release date: 2022-11-14

安全性

• gh-98433 [https://github.com/python/cpython/issues/98433]: The IDNA codec decoder used on DNS hostnames by socket or asyncio related name resolution functions no longer involves a quadratic algorithm. This prevents a potential CPU denial of service if an out-of-spec excessive length hostname involving bidirectional characters were decoded. Some protocols such as urllib http 3xx redirects potentially allow for an attacker to supply such a name.

Individual labels within an IDNA encoded DNS name will now raise an error early during IDNA decoding if they are longer than 1024 unicode characters given that each decoded DNS label must be 63 or fewer characters and the entire decoded DNS name is limited to 255. Only an application presenting a hostname or label consisting primarily of RFC 3454 [https://datatracker.ietf.org/doc/html/rfc3454.html] section 3.1 "Nothing" characters to be removed would run into of this new limit. See also RFC 5894 [https://datatracker.ietf.org/doc/html/rfc5894.html] section 6 and RFC 3491 [https://datatracker.ietf.org/doc/html/rfc3491.html].

• gh-98739 [https://github.com/python/cpython/issues/98739]: Update bundled libexpat to 2.5.0

核心与内置函数

• gh-81057 [https://github.com/python/cpython/issues/81057]: The docs clearly say that PyImport_Inittab, PyImport_AppendInittab(), and PyImport_ExtendInittab() should not be used after Py_Initialize() has been called. We now enforce this for the two functions. Additionally, the runtime now uses an internal copy of PyImport_Inittab, to guard against modification.

• gh-99298 [https://github.com/python/cpython/issues/99298]: Fix an issue that could potentially cause incorrect error handling for some bytecode instructions.

• gh-99254 [https://github.com/python/cpython/issues/99254]: The compiler now removes all unused constants from code objects (except the first one, which may be a docstring).

• gh-99205 [https://github.com/python/cpython/issues/99205]: Fix an issue that prevented PyThreadState and PyInterpreterState memory from being freed properly.

• gh-81057 [https://github.com/python/cpython/issues/81057]: The 18 global C variables holding the state of the allocators have been moved to _PyRuntimeState. This is a strictly internal change with no change in behavior.

• gh-99181 [https://github.com/python/cpython/issues/99181]: Fix failure in except* with unhashable exceptions.

• gh-99204 [https://github.com/python/cpython/issues/99204]: Fix calculation of sys._base_executable when inside a POSIX virtual environment using copies of the python binary when the base installation does not provide the executable name used by the venv. Calculation will fall back to alternative names ("python", "python.").

• gh-96055 [https://github.com/python/cpython/issues/96055]: Update faulthandler to emit an error message with the proper unexpected signal number. Patch by Donghee Na.

• gh-99153 [https://github.com/python/cpython/issues/99153]: Fix location of SyntaxError for a try block with both except and except*.

• gh-98686 [https://github.com/python/cpython/issues/98686]: Merge the adaptive opcode logic into each instruction's unquickened variant, and merge the logic in EXTENDED_ARG_QUICK into EXTENDED_ARG. With these changes, the quickening that happens at code object creation is now only responsible for initializing warmup counters and inserting superinstructions.

• gh-99103 [https://github.com/python/cpython/issues/99103]: Fix the error reporting positions of specialized traceback anchors when the source line contains Unicode characters.

• gh-99139 [https://github.com/python/cpython/issues/99139]: Improve the error suggestion for NameError exceptions for instances. Now if a NameError is raised in a method and the instance has an attribute that's exactly equal to the name in the exception, the suggestion will include self. instead of the closest match in the method scope. Patch by Pablo Galindo

• gh-98401 [https://github.com/python/cpython/issues/98401]: Octal escapes with value larger than 0o377 (ex: "\477"), deprecated in Python 3.11, now produce a SyntaxWarning, instead of DeprecationWarning. In a future Python version they will be eventually a SyntaxError. Patch by Victor Stinner.

• gh-98401 [https://github.com/python/cpython/issues/98401]: A backslash-character pair that is not a valid escape sequence now generates a SyntaxWarning, instead of DeprecationWarning. For example, re.compile("\d+.\d+") now emits a SyntaxWarning ("\d" is an invalid escape sequence), use raw strings for regular expression: re.compile(r"\d+.\d+"). In a future Python version, SyntaxError will eventually be raised, instead of SyntaxWarning. Patch by Victor Stinner.

• gh-96793 [https://github.com/python/cpython/issues/96793]: Handle StopIteration and StopAsyncIteration raised in generator or coroutines in the bytecode, rather than in wrapping C code.

• gh-98931 [https://github.com/python/cpython/issues/98931]: Improve the SyntaxError error message when the user types import x from y instead of from y import x. Patch by Pablo Galindo

• gh-98852 [https://github.com/python/cpython/issues/98852]: Fix subscription of type aliases containing bare generic types or types like TypeVar: for example tuple[A, T][int] and tuple[TypeVar, T][int], where A is a generic type, and T is a type variable.

• gh-98925 [https://github.com/python/cpython/issues/98925]: Lower the recursion depth for marshal on WASI to support (in-development) wasmtime 2.0.

• gh-98783 [https://github.com/python/cpython/issues/98783]: Fix multiple crashes in debug mode when str subclasses are used instead of str itself.

• gh-98811 [https://github.com/python/cpython/issues/98811]: Use complete source locations to simplify detection of __future__ imports which are not at the beginning of the file. Also corrects the offset in the exception raised in one case, which was off by one and impeded highlighting.

• gh-96793 [https://github.com/python/cpython/issues/96793]: Add specialization of FOR_ITER for generators. Saves multiple layers of dispatch and checking to get from the FOR_ITER instruction in the caller to the RESUME in the generator.

• gh-98762 [https://github.com/python/cpython/issues/98762]: Fix source locations of match subpatterns.

• gh-98586 [https://github.com/python/cpython/issues/98586]: Added the methods PyObject_Vectorcall() and PyObject_VectorcallMethod() to the Limited API along with the auxiliary macro constant PY_VECTORCALL_ARGUMENTS_OFFSET.

The availability of these functions enables more efficient PEP 590 [https://peps.python.org/pep-0590/] vector calls from binary extension modules that avoid argument boxing/unboxing overheads.

• gh-99257 [https://github.com/python/cpython/issues/99257]: Fix an issue where member descriptors (such as those for __slots__) could behave incorrectly or crash instead of raising a TypeError when accessed via an instance of an invalid type.

• gh-93143 [https://github.com/python/cpython/issues/93143]: Rather than changing co_code, the interpreter will now display a RuntimeWarning and assign None to any fast locals that are left unbound after jumps or del statements executed while tracing.

• gh-96421 [https://github.com/python/cpython/issues/96421]: When calling into Python code from C code, through PyEval_EvalFrameEx() or a related C-API function, a shim frame in inserted into the call stack. This occurs in the PyEvalEvalFrameDefault() function. The extra frame should be invisible to all Python and most C extensions, but out-of-process profilers and debuggers need to be aware of it. These shim frames can be detected by checking frame->owner == FRAME_OWNED_BY_CSTACK.

Extensions implementing their own interpreters using PEP 523 need to be aware of this shim frame and the changes to the semantics of RETURN_VALUE, YIELD_VALUE, and RETURN_GENERATOR, which now clear the frame.

• gh-98415 [https://github.com/python/cpython/issues/98415]: Fix detection of MAC addresses for uuid on certain OSs. Patch by Chaim Sanders

• gh-98686 [https://github.com/python/cpython/issues/98686]: Quicken all code objects, and specialize adaptive bytecode instructions more aggressively.

• gh-92119 [https://github.com/python/cpython/issues/92119]: Print exception class name instead of its string representation when raising errors from ctypes calls.

• gh-91058 [https://github.com/python/cpython/issues/91058]: ImportError raised from failed from import now include suggestions for the value of based on the available names in . Patch by Pablo Galindo

• gh-96793 [https://github.com/python/cpython/issues/96793]: The FOR_ITER now leaves the iterator on the stack on termination of the loop. This is to assist specialization of loops for generators.

• gh-90716 [https://github.com/python/cpython/issues/90716]: Add _pylong.py module. It includes asymptotically faster algorithms that can be used for operations on integers with many digits. It is used by longobject.c to speed up some operations.

• gh-95389 [https://github.com/python/cpython/issues/95389]: Expose ETH_P_ALL and some of the ETHERTYPE_* constants in socket. Patch by Noam Cohen.

• gh-93696 [https://github.com/python/cpython/issues/93696]: Allow pdb to locate source for frozen modules in the standard library.

库

• gh-99418 [https://github.com/python/cpython/issues/99418]: Fix bug in urllib.parse.urlparse() that causes URL schemes that begin with a digit, a plus sign, or a minus sign to be parsed incorrectly.

• gh-94597 [https://github.com/python/cpython/issues/94597]: Deprecate asyncio.AbstractChildWatcher to be removed in Python 3.14. Patch by Kumar Aditya.

• gh-99305 [https://github.com/python/cpython/issues/99305]: Improve performance of secrets.token_hex().

• gh-74044 [https://github.com/python/cpython/issues/74044]: Fixed bug where inspect.signature() reported incorrect arguments for decorated methods.

• gh-99275 [https://github.com/python/cpython/issues/99275]: Fix SystemError in ctypes when exception was not set during __initsubclass__.

• gh-99277 [https://github.com/python/cpython/issues/99277]: Remove older version of _SSLProtocolTransport.getwritebuffer_limits in asyncio.sslproto

• gh-99248 [https://github.com/python/cpython/issues/99248]: fix negative numbers failing in verify()

• gh-99155 [https://github.com/python/cpython/issues/99155]: Fix statistics.NormalDist pickle with 0 and 1 protocols.

• gh-93464 [https://github.com/python/cpython/issues/93464]: enum.auto() is now correctly activated when combined with other assignment values. E.g. ONE = auto(), 'some text' will now evaluate as (1, 'some text').

• gh-99134 [https://github.com/python/cpython/issues/99134]: Update the bundled copy of pip to version 22.3.1.

• gh-92584 [https://github.com/python/cpython/issues/92584]: Remove the distutils package. It was deprecated in Python 3.10 by PEP 632 [https://peps.python.org/pep-0632/] "Deprecate distutils module". For projects still using distutils and cannot be updated to something else, the setuptools project can be installed: it still provides distutils. Patch by Victor Stinner.

• gh-98999 [https://github.com/python/cpython/issues/98999]: Now _pyio is consistent with _io in raising ValueError when executing methods over closed buffers.

• gh-83004 [https://github.com/python/cpython/issues/83004]: Clean up refleak on failed module initialisation in _zoneinfo

• gh-83004 [https://github.com/python/cpython/issues/83004]: Clean up refleaks on failed module initialisation in _pickle

• gh-83004 [https://github.com/python/cpython/issues/83004]: Clean up refleak on failed module initialisation in _io.

• gh-98897 [https://github.com/python/cpython/issues/98897]: Fix memory leak in math.dist() when both points don't have the same dimension. Patch by Kumar Aditya.

• gh-98878 [https://github.com/python/cpython/issues/98878]: Use the frame bound builtins when offering a name suggestion in traceback to prevent crashing when __builtins__ is not a dict.

• gh-98139 [https://github.com/python/cpython/issues/98139]: In importlib._bootstrap, enhance namespace package repr to .

• gh-90352 [https://github.com/python/cpython/issues/90352]: Fix _SelectorDatagramTransport to inherit from DatagramTransport in asyncio. Patch by Kumar Aditya.

• gh-98793 [https://github.com/python/cpython/issues/98793]: Fix argument typechecks in _overlapped.WSAConnect() and _overlapped.Overlapped.WSASendTo() functions.

• gh-98744 [https://github.com/python/cpython/issues/98744]: Prevent crashing in traceback when retrieving the byte-offset for some source files that contain certain unicode characters.

• gh-98740 [https://github.com/python/cpython/issues/98740]: Fix internal error in the re module which in very rare circumstances prevented compilation of a regular expression containing a conditional expression without the "else" branch.

• gh-98703 [https://github.com/python/cpython/issues/98703]: Fix asyncio.StreamWriter.drain() to call protocol.connection_lost callback only once on Windows.

• gh-98624 [https://github.com/python/cpython/issues/98624]: Add a mutex to unittest.mock.NonCallableMock to protect concurrent access to mock attributes.

• gh-98658 [https://github.com/python/cpython/issues/98658]: The array.array class now supports subscripting, making it a generic type.

• gh-98284 [https://github.com/python/cpython/issues/98284]: Improved TypeError message for undefined abstract methods of a abc.ABC instance. The names of the missing methods are surrounded by single-quotes to highlight them.

• gh-96151 [https://github.com/python/cpython/issues/96151]: Allow BUILTINS to be a valid field name for frozen dataclasses.

• gh-98086 [https://github.com/python/cpython/issues/98086]: Make sure patch.dict() can be applied on async functions.

• gh-72719 [https://github.com/python/cpython/issues/72719]: Remove modules asyncore and asynchat, which were deprecated by PEP 594 [https://peps.python.org/pep-0594/].

• gh-96192 [https://github.com/python/cpython/issues/96192]: Fix handling of bytes pathlike objects in os.ismount().

• gh-94172 [https://github.com/python/cpython/issues/94172]: ftplib: Remove the FTP_TLS.ssl_version class attribute: use the context parameter instead. Patch by Victor Stinner

• gh-94172 [https://github.com/python/cpython/issues/94172]: Remove the keyfile and certfile parameters from the ftplib, imaplib, poplib and smtplib modules, and the key_file, cert_file and check_hostname parameters from the http.client module, all deprecated since Python 3.6. Use the context parameter (ssl_context in imaplib) instead. Patch by Victor Stinner.

• gh-83638 [https://github.com/python/cpython/issues/83638]: Add the autocommit attribute to sqlite3.Connection and the autocommit parameter to sqlite3.connect() to control PEP 249 [https://peps.python.org/pep-0249/]-compliant transaction handling. Patch by Erlend E. Aasland.

• gh-92452 [https://github.com/python/cpython/issues/92452]: Fixed a race condition that could cause sysconfig.getconfigvar() to incorrectly return None in multithreaded programs.

• gh-91803 [https://github.com/python/cpython/issues/91803]: Fix an error when using a method of objects mocked with unittest.mock.create_autospec() after it was sealed with unittest.mock.seal() function.

• bpo-38523 [https://bugs.python.org/issue?@action=redirect&bpo=38523]: shutil.copytree() now applies the ignore_dangling_symlinks argument recursively.

• bpo-40358 [https://bugs.python.org/issue?@action=redirect&bpo=40358]: Add walk_up argument in pathlib.PurePath.relative_to().

• bpo-36267 [https://bugs.python.org/issue?@action=redirect&bpo=36267]: Fix IndexError in argparse.ArgumentParser when a store_true action is given an explicit argument.

文档

• gh-98832 [https://github.com/python/cpython/issues/98832]: Changes wording of docstring for pathlib.Path.iterdir().

• gh-97966 [https://github.com/python/cpython/issues/97966]: Update uname docs to clarify the special nature of the platform attribute and to indicate when it became late-bound.

测试

• gh-98903 [https://github.com/python/cpython/issues/98903]: The Python test suite now fails with exit code 4 if no tests ran. It should help detecting typos in test names and test methods.

• gh-98713 [https://github.com/python/cpython/issues/98713]: Fix a bug in the typing tests where a test relying on CPython-specific implementation details was not decorated with @cpython_only and was not skipped on other implementations.

• gh-87390 [https://github.com/python/cpython/issues/87390]: Add tests for star-unpacking with PEP 646, and some other miscellaneous PEP 646 tests.

• gh-96853 [https://github.com/python/cpython/issues/96853]: Added explicit coverage of Py_Initialize (and hence Py_InitializeEx) back to the embedding tests (all other embedding tests migrated to Py_InitializeFromConfig in Python 3.11)

• bpo-34272 [https://bugs.python.org/issue?@action=redirect&bpo=34272]: Some C API tests were moved into the new Lib/test/test_capi/ directory.

构建

• gh-99086 [https://github.com/python/cpython/issues/99086]: Fix -Wimplicit-int compiler warning in configure check for PTHREAD_SCOPE_SYSTEM.

• gh-99016 [https://github.com/python/cpython/issues/99016]: Fix build with PYTHON_FOR_REGEN=python3.8.

• gh-97731 [https://github.com/python/cpython/issues/97731]: Specify the full path to the source location for make docclean (needed for cross-builds).

• gh-98949 [https://github.com/python/cpython/issues/98949]: Drop unused build dependency on readelf.

• gh-98989 [https://github.com/python/cpython/issues/98989]: Use python3.11, if available, for regeneration and freezing.

• gh-98831 [https://github.com/python/cpython/issues/98831]: Add new tooling, in Tools/cases_generator, to generate the interpreter switch statement from a list of opcode definitions. This only affects adding, modifying or removing instruction definitions. The instruction definitions now live in Python/bytecodes.c, in the form of a custom DSL (under development) [https://github.com/faster-cpython/ideas/blob/main/3.12/interpreter_definition.md]. The tooling reads this file and writes Python/generated_cases.c.h, which is then included by Python/ceval.c to provide most of the cases of the main interpreter switch.

• gh-98817 [https://github.com/python/cpython/issues/98817]: Remove PCbuild/lib.pyproj: it's not used for anything, is only a minor convenience for Visual Studio users (who probably mostly don't even know about it), and it takes a lot of maintenance effort to keep updated.

• gh-98776 [https://github.com/python/cpython/issues/98776]: Fix make regen-test-levenshtein for out-of-tree builds.

• gh-98707 [https://github.com/python/cpython/issues/98707]: Don't use vendored libmpdec headers if --with-system-libmpdec is passed to configure. Don't use vendored libexpat headers if --with-system-expat is passed to configure.

Windows

• gh-98689 [https://github.com/python/cpython/issues/98689]: Update Windows builds to zlib v1.2.13. v1.2.12 has CVE 2022-37434 [https://www.cve.org/CVERecord?id=CVE-2022-37434], but the vulnerable inflateGetHeader API is not used by Python.

• gh-98790 [https://github.com/python/cpython/issues/98790]: Assumes that a missing DLLs directory means that standard extension modules are in the executable's directory.

• gh-98745 [https://github.com/python/cpython/issues/98745]: Update py.exe launcher to install 3.11 by default and 3.12 on request.

• gh-98692 [https://github.com/python/cpython/issues/98692]: Fix the 适用于Windows的Python启动器 ignoring unrecognized shebang lines instead of treating them as local paths

• gh-94328 [https://github.com/python/cpython/issues/94328]: Update Windows installer to use SQLite 3.39.4.

macOS

• gh-94328 [https://github.com/python/cpython/issues/94328]: Update macOS installer to SQLite 3.39.4.

C API

• gh-98724 [https://github.com/python/cpython/issues/98724]: The Py_CLEAR, Py_SETREF and Py_XSETREF macros now only evaluate their argument once. If the argument has side effects, these side effects are no longer duplicated. Patch by Victor Stinner.

• gh-98978 [https://github.com/python/cpython/issues/98978]: Fix use-after-free in Py_SetPythonHome(NULL), Py_SetProgramName(NULL) and PySetProgramFullPath(NULL) function calls. Issue reported by Benedikt Reinartz. Patch by Victor Stinner.

• gh-98410 [https://github.com/python/cpython/issues/98410]: Add getbufferproc and releasebufferproc to the stable API.

• gh-98610 [https://github.com/python/cpython/issues/98610]: Some configurable capabilities of subinterpreters have changed. They always allow subprocesses (subprocess) now, whereas before subprocesses could be optionally disallowed for a subinterpreter. Instead os.exec() can now be disallowed. Disallowing daemon threads is now supported. Disallowing all threads is still allowed, but is never done by default. Note that the optional restrictions are only available through PyNewInterpreterFromConfig(), which isn't a public API. They do not affect the main interpreter, nor Py_NewInterpreter().

• gh-98608 [https://github.com/python/cpython/issues/98608]: A _PyInterpreterConfig has been added and PyNewInterpreter() has been renamed to PyNewInterpreterFromConfig(). The "isolated_subinterpreters" argument is now a granular config that captures the previous behavior. Note that this is all "private" API.

• gh-96853 [https://github.com/python/cpython/issues/96853]: Py_InitializeEx now correctly calls PyConfig_Clear after initializing the interpreter (the omission didn't cause a memory leak only because none of the dynamically allocated config fields are populated by the wrapper function)

• gh-91248 [https://github.com/python/cpython/issues/91248]: Add PyFrame_GetVar() and PyFrame_GetVarString() functions to get a frame variable by its name. Patch by Victor Stinner.