安全性

• gh-108310 [https://github.com/python/cpython/issues/108310]: Fixed an issue where instances of ssl.SSLSocket were vulnerable to a bypass of the TLS handshake and included protections (like certificate verification) and treating sent unencrypted data as if it were post-handshake TLS encrypted data. Security issue reported as CVE 2023-40217 [https://www.cve.org/CVERecord?id=CVE-2023-40217] by Aapo Oksman. Patch by Gregory P. Smith.

• gh-107774 [https://github.com/python/cpython/issues/107774]: PEP 669 specifies that sys.monitoring.register_callback will generate an audit event. Prereleases of Python 3.12 did not generate the audit event. This is now fixed.

• gh-102988 [https://github.com/python/cpython/issues/102988]: Reverted the email.utils security improvement change released in 3.12beta4 that unintentionally caused email.utils.getaddresses to fail to parse email addresses with a comma in the quoted name field. See gh-106669 [https://github.com/python/cpython/issues/106669].

• gh-99108 [https://github.com/python/cpython/issues/99108]: Refresh our new HACL* builtin hashlib code from upstream. Builtin SHA2 should be faster and an issue with SHA3 on 32-bit platforms is fixed.

• gh-102509 [https://github.com/python/cpython/issues/102509]: Start initializing ob_digit during creation of PyLongObject objects. Patch by Illia Volochii.

核心与内置函数

• gh-110782 [https://github.com/python/cpython/issues/110782]: Fix crash when typing.TypeVar is constructed with a keyword argument. Patch by Jelle Zijlstra.

• gh-110752 [https://github.com/python/cpython/issues/110752]: Reset ceval.eval_breaker in interpreter_clear()

• gh-110721 [https://github.com/python/cpython/issues/110721]: Use the traceback implementation for the default PyErr_Display() functionality. Patch by Pablo Galindo

• gh-110696 [https://github.com/python/cpython/issues/110696]: Fix incorrect error message for invalid argument unpacking. Patch by Pablo Galindo

• gh-104169 [https://github.com/python/cpython/issues/104169]: Split the tokenizer into two separate directories: - One part includes the actual lexeme producing logic and lives in Parser/lexer. - The second part wraps the lexer according to the different tokenization modes we have (string, utf-8, file, interactive, readline) and lives in Parser/tokenizer.

• gh-110688 [https://github.com/python/cpython/issues/110688]: Remove undocumented test_c_api method from set, which was only defined for testing purposes under Py_DEBUG. Now we have proper CAPI tests.

• gh-104584 [https://github.com/python/cpython/issues/104584]: Fix a reference leak when running with PYTHONUOPS or -X uops enabled.

• gh-110514 [https://github.com/python/cpython/issues/110514]: Add PY_THROW to sys.setprofile() events

• gh-110489 [https://github.com/python/cpython/issues/110489]: Optimise math.ceil() when the input is exactly a float, resulting in about a 10% improvement.

• gh-110455 [https://github.com/python/cpython/issues/110455]: Guard assert(tstate->thread_id > 0) with #ifndef HAVE_PTHREAD_STUBS. This allows for for pydebug builds to work under WASI which (currently) lacks thread support.

• gh-110309 [https://github.com/python/cpython/issues/110309]: Remove unnecessary empty constant nodes in the ast of fstring specs.

• gh-110259 [https://github.com/python/cpython/issues/110259]: Correctly identify the format spec in fstrings (with single or triple quotes) that have multiple lines in the expression part and include a formatting spec. Patch by Pablo Galindo

• gh-110237 [https://github.com/python/cpython/issues/110237]: Fix missing error checks for calls to PyList_Append in PyEvalMatchClass.

• gh-110164 [https://github.com/python/cpython/issues/110164]: regrtest: If the SOURCE_DATE_EPOCH environment variable is defined, regrtest now disables tests randomization. Patch by Victor Stinner.

• gh-109889 [https://github.com/python/cpython/issues/109889]: Fix the compiler's redundant NOP detection algorithm to skip over NOPs with no line number when looking for the next instruction's lineno.

• gh-109853 [https://github.com/python/cpython/issues/109853]: sys.path[0] is now set correctly for subinterpreters.

• gh-109923 [https://github.com/python/cpython/issues/109923]: Set line number on the POP_TOP that follows a RETURN_GENERATOR.

• gh-105716 [https://github.com/python/cpython/issues/105716]: Subinterpreters now correctly handle the case where they have threads running in the background. Before, such threads would interfere with cleaning up and destroying them, as well as prevent running another script.

• gh-109369 [https://github.com/python/cpython/issues/109369]: The internal eval_breaker and supporting flags, plus the monitoring version have been merged into a single atomic integer to speed up checks.

• gh-109823 [https://github.com/python/cpython/issues/109823]: Fix bug where compiler does not adjust labels when removing an empty basic block which is a jump target.

• gh-109793 [https://github.com/python/cpython/issues/109793]: The main thread no longer exits prematurely when a subinterpreter is cleaned up during runtime finalization. The bug was a problem particularly because, when triggered, the Python process would always return with a 0 exitcode, even if it failed.

• gh-109719 [https://github.com/python/cpython/issues/109719]: Fix missing jump target labels when compiler reorders cold/warm blocks.

• gh-109595 [https://github.com/python/cpython/issues/109595]: Add -X cpu_count command line option to override return results of os.cpu_count() and os.process_cpu_count(). This option is useful for users who need to limit CPU resources of a container system without having to modify the container (application code). Patch by Donghee Na.

• gh-109627 [https://github.com/python/cpython/issues/109627]: Fix bug where the compiler does not assign a new jump target label to a duplicated small exit block.

• gh-109596 [https://github.com/python/cpython/issues/109596]: Fix some tokens in the grammar that were incorrectly marked as soft keywords. Also fix some repeated rule names and ensure that repeated rules are not allowed. Patch by Pablo Galindo

• gh-109496 [https://github.com/python/cpython/issues/109496]: On a Python built in debug mode, Py_DECREF() now calls PyNegativeRefcount() if the object is a dangling pointer to deallocated memory: memory filled with 0xDD "dead byte" by the debug hook on memory allocators. The fix is to check the reference count before checking for PyIsImmortal(). Patch by Victor Stinner.

• gh-107265 [https://github.com/python/cpython/issues/107265]: Deopt opcodes hidden by the executor when base opcode is needed

• gh-109371 [https://github.com/python/cpython/issues/109371]: Deopted instructions correctly for tool initialization and modified the incorrect assertion in instrumentation, when a previous tool already sets INSTRUCTION events

• gh-105658 [https://github.com/python/cpython/issues/105658]: Fix bug where the line trace of an except block ending with a conditional includes an excess event with the line of the conditional expression.

• gh-109219 [https://github.com/python/cpython/issues/109219]: Fix compiling type param scopes that use a name which is also free in an inner scope.

• gh-109351 [https://github.com/python/cpython/issues/109351]: Fix crash when compiling an invalid AST involving a named (walrus) expression.

• gh-109341 [https://github.com/python/cpython/issues/109341]: Fix crash when compiling an invalid AST involving a ast.TypeAlias.

• gh-109195 [https://github.com/python/cpython/issues/109195]: Fix source location for the LOAD_* instruction preceding a LOAD_SUPER_ATTR to load the super global (or shadowing variable) so that it encompasses only the name super and not the following parentheses.

• gh-109256 [https://github.com/python/cpython/issues/109256]: Opcode IDs for specialized opcodes are allocated in their own range to improve stability of the IDs for the 'real' opcodes.

• gh-109216 [https://github.com/python/cpython/issues/109216]: Fix possible memory leak in BUILD_MAP.

• gh-109207 [https://github.com/python/cpython/issues/109207]: Fix a SystemError in _repr_ of symtable entry object.

• gh-109179 [https://github.com/python/cpython/issues/109179]: Fix bug where the C traceback display drops notes from SyntaxError.

• gh-109118 [https://github.com/python/cpython/issues/109118]: Disallow nested scopes (lambdas, generator expressions, and comprehensions) within PEP 695 annotation scopes that are nested within classes.

• gh-109156 [https://github.com/python/cpython/issues/109156]: Add tests for de-instrumenting instructions while keeping the instrumentation for lines

• gh-109114 [https://github.com/python/cpython/issues/109114]: Relax the detection of the error message for invalid lambdas inside fstrings to not search for arbitrary replacement fields to avoid false positives. Patch by Pablo Galindo

• gh-105848 [https://github.com/python/cpython/issues/105848]: Add a new CALL_KW opcode, used for calls containing keyword arguments. Also, fix a possible crash when jumping over method calls in a debugger.

• gh-109052 [https://github.com/python/cpython/issues/109052]: Use the base opcode when comparing code objects to avoid interference from instrumentation

• gh-109118 [https://github.com/python/cpython/issues/109118]: Fix interpreter crash when a NameError is raised inside the type parameters of a generic class.

• gh-88943 [https://github.com/python/cpython/issues/88943]: Improve syntax error for nonASCII character that follows a numerical literal. It now points on the invalid nonASCII character, not on the valid numerical literal.

• gh-108976 [https://github.com/python/cpython/issues/108976]: Fix crash that occurs after de-instrumenting a code object in a monitoring callback.

• gh-108732 [https://github.com/python/cpython/issues/108732]: Make iteration variables of module-and class-scoped comprehensions visible to pdb and other tools that use frame.f_locals again.

• gh-108959 [https://github.com/python/cpython/issues/108959]: Fix caret placement for error locations for subscript and binary operations that involve non-semantic parentheses and spaces. Patch by Pablo Galindo

• gh-104584 [https://github.com/python/cpython/issues/104584]: Fix a crash when running with PYTHONUOPS or -X uops enabled and an error occurs during optimization.

• gh-108727 [https://github.com/python/cpython/issues/108727]: Define tp_dealloc for CounterOptimizer_Type. This fixes a segfault on deallocation.

• gh-108520 [https://github.com/python/cpython/issues/108520]: Fix multiprocessing.synchronize.SemLock.__setstate__() to properly initialize multiprocessing.synchronize.SemLock._is_fork_ctx. This fixes a regression when passing a SemLock across nested processes.

Rename multiprocessing.synchronize.SemLock.is_fork_ctx to multiprocessing.synchronize.SemLock._is_fork_ctx to avoid exposing it as public API.

• gh-108654 [https://github.com/python/cpython/issues/108654]: Restore locals shadowed by an inlined comprehension if the comprehension raises an exception.

• gh-108488 [https://github.com/python/cpython/issues/108488]: Change the initialization of inline cache entries so that the cache entry for JUMP_BACKWARD is initialized to zero, instead of the adaptive_counter_warmup() value used for all other instructions. This counter, unique among instructions, counts up from zero.

• gh-108716 [https://github.com/python/cpython/issues/108716]: Turn off deepfreezing of code objects. Modules are still frozen, so that a file system search is not needed for common modules.

• gh-108614 [https://github.com/python/cpython/issues/108614]: Add RESUME_CHECK instruction, to avoid having to handle instrumentation, signals, and contexts switches in the tier 2 execution engine.

• gh-108487 [https://github.com/python/cpython/issues/108487]: Move an assert that would cause a spurious crash in a devious case that should only trigger deoptimization.

• gh-106176 [https://github.com/python/cpython/issues/106176]: Use a WeakValueDictionary to track the lists containing the modules each thread is currently importing. This helps avoid a reference leak from keeping the list around longer than necessary. Weakrefs are used as GC can't interrupt the cleanup.

• gh-105481 [https://github.com/python/cpython/issues/105481]: The regen-opcode build stage was removed and its work is now done in regen-cases.

• gh-107901 [https://github.com/python/cpython/issues/107901]: Fix missing line number on JUMP_BACKWARD at the end of a for loop.

• gh-108113 [https://github.com/python/cpython/issues/108113]: The compile() builtin can now accept a new flag, ast.PyCF_OPTIMIZED_AST, which is similar to ast.PyCF_ONLY_AST except that the returned AST is optimized according to the value of the optimize argument.

ast.parse() now accepts an optional argument optimize which is passed on to the compile() builtin. This makes it possible to obtain an optimized AST.

• gh-107971 [https://github.com/python/cpython/issues/107971]: Opcode IDs are generated from bytecodes.c instead of being hard coded in opcode.py.

• gh-107944 [https://github.com/python/cpython/issues/107944]: Improve error message for function calls with bad keyword arguments. Patch by Pablo Galindo

• gh-108390 [https://github.com/python/cpython/issues/108390]: Raise an exception when setting a nonlocal event (RAISE, EXCEPTION_HANDLED, etc.) in sys.monitoring.set_local_events.

Fixes crash when tracing in recursive calls to Python classes.

• gh-108035 [https://github.com/python/cpython/issues/108035]: Remove the _PyCFrame struct, moving the pointer to the current interpreter frame back to the threadstate, as it was for 3.10 and earlier. The _PyCFrame existed as a performance optimization for tracing. Since PEP 669 has been implemented, this optimization no longer applies.

• gh-91051 [https://github.com/python/cpython/issues/91051]: Fix abort / segfault when using all eight type watcher slots, on platforms where char is signed by default.

• gh-106581 [https://github.com/python/cpython/issues/106581]: Fix possible assertion failures and missing instrumentation events when PYTHONUOPS or -X uops is enabled.

• gh-107526 [https://github.com/python/cpython/issues/107526]: Revert converting vars, dir, next, getattr, and iter to argument clinic.

• gh-84805 [https://github.com/python/cpython/issues/84805]: Autogenerate signature for METH_NOARGS and METH_O extension functions.

• gh-107758 [https://github.com/python/cpython/issues/107758]: Make the dump_stack() routine used by the lltrace feature (low-level interpreter debugging) robust against recursion by ensuring that it never calls a _repr_ method implemented in Python. Also make the similar output for Tier-2 uops appear on stdout (instead of stderr), to match the lltrace code in ceval.c.

• gh-107659 [https://github.com/python/cpython/issues/107659]: Add docstrings for ctypes.pointer() and ctypes.POINTER().

• gh-105848 [https://github.com/python/cpython/issues/105848]: Modify the bytecode so that the actual callable for a CALL is at a consistent position on the stack (regardless of whether or not bound-method-calling optimizations are active).

• gh-107674 [https://github.com/python/cpython/issues/107674]: Fixed performance regression in sys.settrace.

• gh-107724 [https://github.com/python/cpython/issues/107724]: In prerelease versions of 3.12, up to rc1, the sys.monitoring callback function for the PY_THROW event was missing the third, exception argument. That is now fixed.

• gh-84436 [https://github.com/python/cpython/issues/84436]: Skip reference count modifications for many known immortal objects.

• gh-107596 [https://github.com/python/cpython/issues/107596]: Specialize subscripting str objects by int indexes.

• gh-107080 [https://github.com/python/cpython/issues/107080]: Trace refs builds (--with-trace-refs) were crashing when used with isolated subinterpreters. The problematic global state has been isolated to each interpreter. Other fixing the crashes, this change does not affect users.

• gh-107557 [https://github.com/python/cpython/issues/107557]: Generate the cases needed for the barebones tier 2 abstract interpreter for optimization passes in CPython.

• gh-106608 [https://github.com/python/cpython/issues/106608]: Make _PyUOpExecutorObject variable length.

• gh-100964 [https://github.com/python/cpython/issues/100964]: Clear generators' exception state after return to break reference cycles.

• gh-107455 [https://github.com/python/cpython/issues/107455]: Improve error messages when converting an incompatible type to ctypes.c_char_p, ctypes.c_wchar_p and ctypes.c_void_p.

• gh-107263 [https://github.com/python/cpython/issues/107263]: Increase C recursion limit for functions other than the main interpreter from 800 to 1500. This should allow functions like list._repr_ and json.dumps to handle all the inputs that they could prior to 3.12

• gh-104584 [https://github.com/python/cpython/issues/104584]: Fix an issue which caused incorrect inline caches to be read when running with PYTHONUOPS or -X uops enabled.

• gh-104432 [https://github.com/python/cpython/issues/104432]: Fix potential unaligned memory access on C APIs involving returned sequences of char * pointers within the grp and socket modules. These were revealed using a -fsaniziter=alignment build on ARM macOS. Patch by Christopher Chavez.

• gh-106078 [https://github.com/python/cpython/issues/106078]: Isolate _decimal (apply PEP 687 [https://peps.python.org/pep-0687/]). Patch by Charlie Zhao.

• gh-106898 [https://github.com/python/cpython/issues/106898]: Add the exception as the third argument to PY_UNIND callbacks in sys.monitoring. This makes the PY_UNWIND callback consistent with the other exception handling callbacks.

• gh-106895 [https://github.com/python/cpython/issues/106895]: Raise a ValueError when a monitoring callback function returns DISABLE for events that cannot be disabled locally.

• gh-106897 [https://github.com/python/cpython/issues/106897]: Add a RERAISE event to sys.monitoring, which occurs when an exception is reraise, either explicitly by a plain raise statement, or implicitly in an except or finally block.

• gh-77377 [https://github.com/python/cpython/issues/77377]: Ensure that multiprocessing synchronization objects created in a fork context are not sent to a different process created in a spawn context. This changes a segfault into an actionable RuntimeError in the parent process.

• gh-106931 [https://github.com/python/cpython/issues/106931]: Statically allocated string objects are now interned globally instead of per-interpreter. This fixes a situation where such a string would only be interned in a single interpreter. Normal string objects are unaffected.

• gh-104621 [https://github.com/python/cpython/issues/104621]: Unsupported modules now always fail to be imported.

• gh-107122 [https://github.com/python/cpython/issues/107122]: Add dbm.ndbm.ndbm.clear() to dbm.ndbm. Patch By Donghee Na.

• gh-107122 [https://github.com/python/cpython/issues/107122]: Add dbm.gnu.gdbm.clear() to dbm.gnu. Patch By Donghee Na.

• gh-107015 [https://github.com/python/cpython/issues/107015]: The ASYNC and AWAIT tokens are removed from the Grammar, which removes the possibility of making async and await soft keywords when using feature_version<7 in ast.parse().

• gh-106917 [https://github.com/python/cpython/issues/106917]: Fix classmethod-style super() method calls (i.e., where the second argument to super(), or the implied second argument drawn from self/cls in the case of zero-arg super, is a type) when the target of the call is not a classmethod.

• gh-105699 [https://github.com/python/cpython/issues/105699]: Python no longer crashes due an infrequent race when initializing per-interpreter interned strings. The crash would manifest when the interpreter was finalized.

• gh-105699 [https://github.com/python/cpython/issues/105699]: Python no longer crashes due to an infrequent race in setting Py_FileSystemDefaultEncoding and Py_FileSystemDefaultEncodeErrors (both deprecated), when simultaneously initializing two isolated subinterpreters. Now they are only set during runtime initialization.

• gh-106908 [https://github.com/python/cpython/issues/106908]: Fix various hangs, reference leaks, test failures, and tracing/introspection bugs when running with PYTHONUOPS or -X uops enabled.

• gh-106092 [https://github.com/python/cpython/issues/106092]: Fix a segmentation fault caused by a use-after-free bug in frame_dealloc when the trashcan delays the deallocation of a PyFrameObject.

• gh-106485 [https://github.com/python/cpython/issues/106485]: Reduce the number of materialized instances dictionaries by dematerializing them when possible.

• gh-106719 [https://github.com/python/cpython/issues/106719]: No longer suppress arbitrary errors in the __annotations__ getter and setter in the type and module types.

• gh-106723 [https://github.com/python/cpython/issues/106723]: Propagate frozen_modules to multiprocessing spawned process interpreters.

• gh-104909 [https://github.com/python/cpython/issues/104909]: Split LOAD_ATTR_INSTANCE_VALUE into microops.

• gh-104909 [https://github.com/python/cpython/issues/104909]: Split LOAD_GLOBAL specializations into microops.

• gh-106597 [https://github.com/python/cpython/issues/106597]: A new debug structure of offsets has been added to the _PyRuntimeState that will help out-of-process debuggers and profilers to obtain the offsets to relevant interpreter structures in a way that is agnostic of how Python was compiled and that doesn't require copying the headers. Patch by Pablo Galindo

• gh-106487 [https://github.com/python/cpython/issues/106487]: Allow the count argument of str.replace() to be a keyword. Patch by Hugo van Kemenade.

• gh-96844 [https://github.com/python/cpython/issues/96844]: Improve error message of list.remove(). Patch by Donghee Na.

• gh-81283 [https://github.com/python/cpython/issues/81283]: Compiler now strips indents from docstrings. It reduces pyc file size 5% when the module is heavily documented. This change affects to __doc__ so tools like doctest will be affected.

• gh-106396 [https://github.com/python/cpython/issues/106396]: When the format specification of an fstring expression is empty, the parser now generates an empty ast.JoinedStr node for it instead of an one-element ast.JoinedStr with an empty string ast.Constant.

• gh-100288 [https://github.com/python/cpython/issues/100288]: Specialize LOAD_ATTR for non-descriptors on the class. Adds LOAD_ATTR_NONDESCRIPTOR_WITH_VALUES and LOAD_ATTR_NONDESCRIPTOR_NO_DICT.

• gh-106008 [https://github.com/python/cpython/issues/106008]: Fix possible reference leaks when failing to optimize comparisons with None in the bytecode compiler.

• gh-106145 [https://github.com/python/cpython/issues/106145]: Make end_lineno and end_col_offset required on type_param ast nodes.

• gh-106213 [https://github.com/python/cpython/issues/106213]: Changed the way that Emscripten call trampolines work for compatibility with Wasm/JS Promise integration.

• gh-106182 [https://github.com/python/cpython/issues/106182]: sys.getfilesystemencoding() and sys.getfilesystemencodeerrors now return interned Unicode object.

• gh-106210 [https://github.com/python/cpython/issues/106210]: Removed Emscripten import trampoline as it was no longer necessary for Pyodide.

• gh-104584 [https://github.com/python/cpython/issues/104584]: Added a new, experimental, tracing optimizer and interpreter (a.k.a. "tier 2"). This currently pessimizes, so don't use yet — this is infrastructure so we can experiment with optimizing passes. To enable it, pass -Xuops or set PYTHONUOPS=1. To get debug output, set PYTHONUOPSDEBUG=N where N is a debug level (0-4, where 0 is no debug output and 4 is excessively verbose).

• gh-105775 [https://github.com/python/cpython/issues/105775]: LOAD_CLOSURE is now a pseudo-op.

• gh-105730 [https://github.com/python/cpython/issues/105730]: Allow any callable other than type objects as the condition predicate in BaseExceptionGroup.split() and BaseExceptionGroup.subgroup().

• gh-105979 [https://github.com/python/cpython/issues/105979]: Fix crash in imp.getfrozen_object() due to improper exception handling.

• gh-106003 [https://github.com/python/cpython/issues/106003]: Add a new TO_BOOL instruction, which performs boolean conversions for POP_JUMP_IF_TRUE, POP_JUMP_IF_FALSE, and UNARY_NOT (which all expect exact bool values now). Also, modify the oparg of COMPARE_OP to include an optional "boolean conversion" flag.

• gh-98931 [https://github.com/python/cpython/issues/98931]: Ensure custom SyntaxError error messages are raised for invalid imports with multiple targets. Patch by Pablo Galindo

• gh-105724 [https://github.com/python/cpython/issues/105724]: Improve assert error messages by providing exact error range.

• gh-105908 [https://github.com/python/cpython/issues/105908]: Fixed bug where gh-99111 [https://github.com/python/cpython/issues/99111] breaks future import barryasFLUFL in the Python REPL.

• gh-105840 [https://github.com/python/cpython/issues/105840]: Fix possible crashes when specializing function calls with too many __defaults__.

• gh-105831 [https://github.com/python/cpython/issues/105831]: Fix an fstring bug, where using a debug expression (the = sign) that appears in the last line of a file results to the debug buffer that holds the expression text being one character too small.

• gh-105800 [https://github.com/python/cpython/issues/105800]: Correctly issue SyntaxWarning in fstrings if invalid sequences are used. Patch by Pablo Galindo

• gh-105340 [https://github.com/python/cpython/issues/105340]: Include the comprehension iteration variable in locals() inside a module-or class-scope comprehension.

• gh-105331 [https://github.com/python/cpython/issues/105331]: Raise ValueError if the delay argument to asyncio.sleep() is a NaN (matching time.sleep()).

• gh-105587 [https://github.com/python/cpython/issues/105587]: The runtime can't guarantee that immortal objects will not be mutated by Extensions. Thus, this modifies PyStaticObjectCheckRefcnt to warn instead of asserting.

• gh-105564 [https://github.com/python/cpython/issues/105564]: Don't include artificil newlines in the line attribute of tokens in the APIs of the tokenize module. Patch by Pablo Galindo

• gh-105549 [https://github.com/python/cpython/issues/105549]: Tokenize separately NUMBER and NAME tokens that are not ambiguous. Patch by Pablo Galindo.

• gh-105588 [https://github.com/python/cpython/issues/105588]: Fix an issue that could result in crashes when compiling malformed ast nodes.

• gh-100987 [https://github.com/python/cpython/issues/100987]: Allow objects other than code objects as the "executable" in internal frames. In the long term, this can help tools like Cython and PySpy interact more efficiently. In the shorter term, it allows us to perform some optimizations more simply.

• gh-105375 [https://github.com/python/cpython/issues/105375]: Fix bugs in the builtins module where exceptions could end up being overwritten.

• gh-105375 [https://github.com/python/cpython/issues/105375]: Fix bug in the compiler where an exception could end up being overwritten.

• gh-105375 [https://github.com/python/cpython/issues/105375]: Improve error handling in PyUnicode_BuildEncodingMap() where an exception could end up being overwritten.

• gh-105486 [https://github.com/python/cpython/issues/105486]: Change the repr of ParamSpec list of args in types.GenericAlias.

• gh-105678 [https://github.com/python/cpython/issues/105678]: Break the MAKE_FUNCTION instruction into two parts, MAKE_FUNCTION which makes the function and SET_FUNCTION_ATTRIBUTE which sets the attributes on the function. This makes the stack effect of MAKE_FUNCTION regular to ease optimization and code generation.

• gh-105435 [https://github.com/python/cpython/issues/105435]: Fix spurious newline character if file ends on a comment without a newline. Patch by Pablo Galindo

• gh-105390 [https://github.com/python/cpython/issues/105390]: Correctly raise tokenize.TokenError exceptions instead of SyntaxError for tokenize errors such as incomplete input. Patch by Pablo Galindo

• gh-105259 [https://github.com/python/cpython/issues/105259]: Don't include newline character for trailing NEWLINE tokens emitted in the tokenize module. Patch by Pablo Galindo

• gh-104635 [https://github.com/python/cpython/issues/104635]: Eliminate redundant STORE_FAST instructions in the compiler. Patch by Donghee Na and Carl Meyer.

• gh-105324 [https://github.com/python/cpython/issues/105324]: Fix the main function of the tokenize module when reading from sys.stdin. Patch by Pablo Galindo

• gh-33092 [https://github.com/python/cpython/issues/33092]: Simplify and speed up interpreter for fstrings. Removes FORMAT_VALUE opcode. Add CONVERT_VALUE, FORMAT_SIMPLE and FORMAT_WITH_SPEC opcode. Compiler emits more efficient sequence for each format expression.

• gh-105229 [https://github.com/python/cpython/issues/105229]: Remove remaining two-codeunit superinstructions. All remaining superinstructions only take a single codeunit, simplifying instrumentation and quickening.

• gh-105235 [https://github.com/python/cpython/issues/105235]: Prevent out-of-bounds memory access during mmap.find() calls.

• gh-98963 [https://github.com/python/cpython/issues/98963]: Restore the ability for a subclass of property to define __slots__ or otherwise be dict-less by ignoring failures to set a docstring on such a class. This behavior had regressed in 3.12beta1. An AttributeError where there had not previously been one was disruptive to existing code.

• gh-104812 [https://github.com/python/cpython/issues/104812]: The "pending call" machinery now works for all interpreters, not just the main interpreter, and runs in all threads, not just the main thread. Some calls are still only done in the main thread, ergo in the main interpreter. This change does not affect signal handling nor the existing public C-API (Py_AddPendingCall()), which both still only target the main thread. The new functionality is meant strictly for internal use for now, since consequences of its use are not well understood yet outside some very restricted cases. This change brings the capability in line with the intention when the state was made per-interpreter several years ago.

• gh-105194 [https://github.com/python/cpython/issues/105194]: Do not escape with backslashes fstring format specifiers. Patch by Pablo Galindo

• gh-105229 [https://github.com/python/cpython/issues/105229]: Replace some dynamic superinstructions with single instruction equivalents.

• gh-105162 [https://github.com/python/cpython/issues/105162]: Fixed bug in generator.close()/throw() where an inner iterator would be ignored when the outer iterator was instrumented.

• gh-105164 [https://github.com/python/cpython/issues/105164]: Ensure annotations are set up correctly if the only annotation in a block is within a match block. Patch by Jelle Zijlstra.

• gh-105148 [https://github.com/python/cpython/issues/105148]: Make _PyASTOptimizeState internal to ast_opt.c. Make PyASTOptimize take two integers instead of a pointer to this struct. This avoids the need to include pycore_compile.h in ast_opt.c.

• gh-104799 [https://github.com/python/cpython/issues/104799]: Attributes of ast nodes that are lists now default to the empty list if omitted. This means that some code that previously raised TypeError when the AST node was used will now proceed with the empty list instead. Patch by Jelle Zijlstra.

• gh-105111 [https://github.com/python/cpython/issues/105111]: Remove the old trashcan macros Py_TRASHCAN_SAFE_BEGIN and Py_TRASHCAN_SAFE_END. They should be replaced by the new macros Py_TRASHCAN_BEGIN and Py_TRASHCAN_END.

• gh-105035 [https://github.com/python/cpython/issues/105035]: Fix super() calls on types with custom tp_getattro implementation (e.g. meta-types.)

• gh-105017 [https://github.com/python/cpython/issues/105017]: Show CRLF lines in the tokenize string attribute in both NL and NEWLINE tokens. Patch by Marta Gómez.

• gh-105013 [https://github.com/python/cpython/issues/105013]: Fix handling of multiline parenthesized lambdas in inspect.getsource(). Patch by Pablo Galindo

• gh-105017 [https://github.com/python/cpython/issues/105017]: Do not include an additional final NL token when parsing files having CRLF lines. Patch by Marta Gómez.

• gh-104976 [https://github.com/python/cpython/issues/104976]: Ensure that trailing DEDENT tokenize.TokenInfo objects emitted by the tokenize module are reported as in Python 3.11. Patch by Pablo Galindo

• gh-104972 [https://github.com/python/cpython/issues/104972]: Ensure that the line attribute in tokenize.TokenInfo objects in the tokenize module are always correct. Patch by Pablo Galindo

• gh-104955 [https://github.com/python/cpython/issues/104955]: Fix signature for the new __release_buffer__() slot. Patch by Jelle Zijlstra.

• gh-104690 [https://github.com/python/cpython/issues/104690]: Starting new threads and process creation through os.fork() during interpreter shutdown (such as from atexit handlers) is no longer supported. It can lead to race condition between the main Python runtime thread freeing thread states while internal threading routines are trying to allocate and use the state of just created threads. Or forked children trying to use the mid-shutdown runtime and thread state in the child process.

• gh-104879 [https://github.com/python/cpython/issues/104879]: Fix crash when accessing the __module__ attribute of type aliases defined outside a module. Patch by Jelle Zijlstra.

• gh-104825 [https://github.com/python/cpython/issues/104825]: Tokens emitted by the tokenize module do not include an implicit \n character in the line attribute anymore. Patch by Pablo Galindo

• gh-104770 [https://github.com/python/cpython/issues/104770]: If a generator returns a value upon being closed, the value is now returned by generator.close().

• gh-89091 [https://github.com/python/cpython/issues/89091]: Raise RuntimeWarning for unawaited async generator methods like asend(), athrow() and aclose(). Patch by Kumar Aditya.

• gh-96663 [https://github.com/python/cpython/issues/96663]: Add a better, more introspectable error message when setting attributes on classes without a __dict__ and no slot member for the attribute.

• gh-93627 [https://github.com/python/cpython/issues/93627]: Update the Python pickle module implementation to match the C implementation of the pickle module. For objects setting reduction methods like __reduce_ex__() or __reduce__() to None, pickling will result in a TypeError.

• gh-101006 [https://github.com/python/cpython/issues/101006]: Improve error handling when read marshal data.

• gh-91095 [https://github.com/python/cpython/issues/91095]: Specializes calls to most Python classes. Specifically, any class that inherits from object, or another Python class, and does not override _new_.

The specialized instruction does the following:

• Creates the object (by calling object._new_)

• Pushes a shim frame to the frame stack (to cleanup after __init__)

• Pushes the frame for __init__ to the frame stack

Speeds up the instantiation of most Python classes.

库

• gh-110786 [https://github.com/python/cpython/issues/110786]: sysconfig's CLI now ignores BrokenPipeError, making it exit normally if its output is being piped and the pipe closes.

• gh-103480 [https://github.com/python/cpython/issues/103480]: The sysconfig module is now a package, instead of a single-file module.

• gh-110733 [https://github.com/python/cpython/issues/110733]: Microoptimization: Avoid calling min(), max() in BaseEventLoop.runonce().

• gh-94597 [https://github.com/python/cpython/issues/94597]: Added asyncio.EventLoop for use with the asyncio.run() loop_factory kwarg to avoid calling the asyncio policy system.

• gh-110682 [https://github.com/python/cpython/issues/110682]: runtime-checkable protocols used to consider __match_args__ a protocol member in __instancecheck__ if it was present on the protocol. Now, this attribute is ignored if it is present.

• gh-110488 [https://github.com/python/cpython/issues/110488]: Fix a couple of issues in pathlib.PurePath.with_name(): a single dot was incorrectly considered a valid name, and in PureWindowsPath, a name with an NTFS alternate data stream, like a:b, was incorrectly considered invalid.

• gh-110590 [https://github.com/python/cpython/issues/110590]: Fix a bug in _sre.compile() where TypeError would be overwritten by OverflowError when the code argument was a list of non-ints.

• gh-65052 [https://github.com/python/cpython/issues/65052]: Prevent pdb from crashing when trying to display undisplayable objects

• gh-110519 [https://github.com/python/cpython/issues/110519]: Deprecation warning about non-integer number in gettext now always refers to the line in the user code where gettext function or method is used. Previously it could refer to a line in gettext code.

• gh-89902 [https://github.com/python/cpython/issues/89902]: Deprecate non-standard format specifier "N" for decimal.Decimal. It was not documented and only supported in the C implementation.

• gh-110378 [https://github.com/python/cpython/issues/110378]: contextmanager() and asynccontextmanager() context managers now close an invalid underlying generator object that yields more then one value.

• gh-106670 [https://github.com/python/cpython/issues/106670]: In pdb, set convenience variable $_exception for post mortem debugging.

• gh-110365 [https://github.com/python/cpython/issues/110365]: Fix termios.tcsetattr() bug that was overwriting existing errors during parsing integers from term list.

• gh-109653 [https://github.com/python/cpython/issues/109653]: Slightly improve the import time of several standard-library modules by deferring imports of warnings within those modules. Patch by Alex Waygood.

• gh-110273 [https://github.com/python/cpython/issues/110273]: dataclasses.replace() now raises TypeError instead of ValueError if specify keyword argument for a field declared with init=False or miss keyword argument for required InitVar field.

• gh-110249 [https://github.com/python/cpython/issues/110249]: Add --inlinecaches flag to dis command line.

• gh-109653 [https://github.com/python/cpython/issues/109653]: Fix a Python 3.12 regression in the import time of random. Patch by Alex Waygood.

• gh-110222 [https://github.com/python/cpython/issues/110222]: Add support of struct sequence objects in copy.replace(). Patched by Xuehai Pan.

• gh-109649 [https://github.com/python/cpython/issues/109649]: multiprocessing, concurrent.futures, compileall: Replace os.cpu_count() with os.process_cpu_count() to select the default number of worker threads and processes. Get the CPU affinity if supported. Patch by Victor Stinner.

• gh-110150 [https://github.com/python/cpython/issues/110150]: Fix base case handling in statistics.quantiles. Now allows a single data point.

• gh-110036 [https://github.com/python/cpython/issues/110036]: On Windows, multiprocessing Popen.terminate() now catches PermissionError and get the process exit code. If the process is still running, raise again the PermissionError. Otherwise, the process terminated as expected: store its exit code. Patch by Victor Stinner.

• gh-110038 [https://github.com/python/cpython/issues/110038]: Fixed an issue that caused KqueueSelector.select() to not return all the ready events in some cases when a file descriptor is registered for both read and write.

• gh-110045 [https://github.com/python/cpython/issues/110045]: Update the symtable module to support the new scopes introduced by PEP 695 [https://peps.python.org/pep-0695/].

• gh-88402 [https://github.com/python/cpython/issues/88402]: Add new variables to sysconfig.getconfigvars() on Windows: LIBRARY, LDLIBRARY, LIBDIR, SOABI, and Py_NOGIL.

• gh-109631 [https://github.com/python/cpython/issues/109631]: re functions such as re.findall(), re.split(), re.search() and re.sub() which perform short repeated matches can now be interrupted by user.

• gh-109653 [https://github.com/python/cpython/issues/109653]: Reduce the import time of email.utils by around 43%. This results in the import time of email.message falling by around 18%, which in turn reduces the import time of importlib.metadata by around 6%. Patch by Alex Waygood.

• gh-109818 [https://github.com/python/cpython/issues/109818]: Fix reprlib.recursive_repr() not copying __type_params__ from decorated function.

• gh-109047 [https://github.com/python/cpython/issues/109047]: concurrent.futures: The executor manager thread now catches exceptions when adding an item to the call queue. During Python finalization, creating a new thread can now raise RuntimeError. Catch the exception and call terminate_broken() in this case. Patch by Victor Stinner.

• gh-109782 [https://github.com/python/cpython/issues/109782]: Ensure the signature of os.path.isdir() is identical on all platforms. Patch by Amin Alaee.

• gh-109653 [https://github.com/python/cpython/issues/109653]: Improve import time of functools by around 13%. Patch by Alex Waygood.

• gh-109590 [https://github.com/python/cpython/issues/109590]: shutil.which() will prefer files with an extension in PATHEXT if the given mode includes os.X_OK on win32. If no PATHEXT match is found, a file without an extension in PATHEXT can be returned. This change will have shutil.which() act more similarly to previous behavior in Python 3.11.

• gh-109653 [https://github.com/python/cpython/issues/109653]: Reduce the import time of enum by over 50%. Patch by Alex Waygood.

• gh-109593 [https://github.com/python/cpython/issues/109593]: Avoid deadlocking on a reentrant call to the multiprocessing resource tracker. Such a reentrant call, though unlikely, can happen if a GC pass invokes the finalizer for a multiprocessing object such as SemLock.

• gh-109653 [https://github.com/python/cpython/issues/109653]: Reduce the import time of typing by around a third. Patch by Alex Waygood.

• gh-109649 [https://github.com/python/cpython/issues/109649]: Add os.process_cpu_count() function to get the number of logical CPUs usable by the calling thread of the current process. Patch by Victor Stinner.

• gh-74481 [https://github.com/python/cpython/issues/74481]: Add set_error_mode related constants in msvcrt module in Python debug build.

• gh-109613 [https://github.com/python/cpython/issues/109613]: Fix os.stat() and os.DirEntry.stat(): check for exceptions. Previously, on Python built in debug mode, these functions could trigger a fatal Python error (and abort the process) when a function succeeded with an exception set. Patch by Victor Stinner.

• gh-109599 [https://github.com/python/cpython/issues/109599]: Expose the type of PyCapsule objects as types.CapsuleType.

• gh-109109 [https://github.com/python/cpython/issues/109109]: You can now get the raw TLS certificate chains from TLS connections via ssl.SSLSocket.get_verified_chain() and ssl.SSLSocket.get_unverified_chain() methods.

Contributed by Mateusz Nowak.

• gh-109559 [https://github.com/python/cpython/issues/109559]: Update unicodedata database to Unicode 15.1.0.

• gh-109543 [https://github.com/python/cpython/issues/109543]: Remove unnecessary hasattr() check during typing.TypedDict creation.

• gh-109495 [https://github.com/python/cpython/issues/109495]: Remove unnecessary extra __slots__ in datetime's pure python implementation to reduce memory size, as they are defined in the superclass. Patch by James Hilton-Balfe

• gh-109461 [https://github.com/python/cpython/issues/109461]: logging: Use a context manager for lock acquisition.

• gh-109096 [https://github.com/python/cpython/issues/109096]: http.server.CGIHTTPRequestHandler has been deprecated for removal in 3.15. Its design is old and the web world has long since moved beyond CGI.

• gh-109409 [https://github.com/python/cpython/issues/109409]: Fix error when it was possible to inherit a frozen dataclass from multiple parents some of which were possibly not frozen.

• gh-109375 [https://github.com/python/cpython/issues/109375]: The pdb alias command now prevents registering aliases without arguments.

• gh-109319 [https://github.com/python/cpython/issues/109319]: Deprecate the dis.HAVE_ARGUMENT field in favour of dis.hasarg.

• gh-107219 [https://github.com/python/cpython/issues/107219]: Fix a race condition in concurrent.futures. When a process in the process pool was terminated abruptly (while the future was running or pending), close the connection write end. If the call queue is blocked on sending bytes to a worker process, closing the connection write end interrupts the send, so the queue can be closed. Patch by Victor Stinner.

• gh-66143 [https://github.com/python/cpython/issues/66143]: The codecs.CodecInfo object has been made copyable and pickleable. Patched by Robert Lehmann and Furkan Onder.

• gh-109187 [https://github.com/python/cpython/issues/109187]: pathlib.Path.resolve() now treats symlink loops like other errors: in strict mode, OSError is raised, and in non-strict mode, no exception is raised.

• gh-50644 [https://github.com/python/cpython/issues/50644]: Attempts to pickle or create a shallow or deep copy of codecs streams now raise a TypeError. Previously, copying failed with a RecursionError, while pickling produced wrong results that eventually caused unpickling to fail with a RecursionError.

• gh-109174 [https://github.com/python/cpython/issues/109174]: Add support of types.SimpleNamespace in copy.replace().

• gh-109164 [https://github.com/python/cpython/issues/109164]: pdb: Replace getopt with argparse for parsing command line arguments.

• gh-109151 [https://github.com/python/cpython/issues/109151]: Enable readline editing features in the sqlite3 commandline interface (python -m sqlite3).

• gh-108987 [https://github.com/python/cpython/issues/108987]: Fix thread.startnew_thread() race condition. If a thread is created during Python finalization, the newly spawned thread now exits immediately instead of trying to access freed memory and lead to a crash. Patch by Victor Stinner.

• gh-108682 [https://github.com/python/cpython/issues/108682]: Enum: require names=() or type=… to create an empty enum using the functional syntax.

• gh-109033 [https://github.com/python/cpython/issues/109033]: Exceptions raised by os.utime builtin function now include the related filename

• gh-108843 [https://github.com/python/cpython/issues/108843]: Fix an issue in ast.unparse() when unparsing fstrings containing many quote types.

• gh-108469 [https://github.com/python/cpython/issues/108469]: ast.unparse() now supports new fstring syntax introduced in Python 3.12. Note that the fstring quotes are reselected for simplicity under the new syntax. (Patch by Steven Sun)

• gh-108751 [https://github.com/python/cpython/issues/108751]: Add copy.replace() function which allows to create a modified copy of an object. It supports named tuples, dataclasses, and many other objects.

• gh-108682 [https://github.com/python/cpython/issues/108682]: Enum: raise TypeError if super()._new_() is called from a custom _new_.

• gh-108278 [https://github.com/python/cpython/issues/108278]: Deprecate passing the callback callable by keyword for the following sqlite3.Connection APIs:

  • set_authorizer()

  • set_progress_handler()

  • set_trace_callback()

受影响的形参将在 Python 3.15 中成为仅限位置形参。

Patch by Erlend E. Aasland.

• gh-105829 [https://github.com/python/cpython/issues/105829]: Fix concurrent.futures.ProcessPoolExecutor deadlock

• gh-108295 [https://github.com/python/cpython/issues/108295]: Fix crashes related to use of weakrefs on typing.TypeVar.

• gh-108463 [https://github.com/python/cpython/issues/108463]: Make expressions/statements work as expected in pdb

• gh-108277 [https://github.com/python/cpython/issues/108277]: Add os.timerfd_create(), os.timerfd_settime(), os.timerfd_gettime(), os.timerfd_settime_ns(), and os.timerfd_gettime_ns() to provide a low level interface for Linux's timer notification file descriptor.

• gh-107811 [https://github.com/python/cpython/issues/107811]: tarfile: extraction of members with overly large UID or GID (e.g. on an OS with 32-bit id_t) now fails in the same way as failing to set the ID.

• gh-64662 [https://github.com/python/cpython/issues/64662]: Fix support for virtual tables in sqlite3.Connection.iterdump(). Patch by Aviv Palivoda.

• gh-108111 [https://github.com/python/cpython/issues/108111]: Fix a regression introduced in gh-101251 [https://github.com/python/cpython/issues/101251] for 3.12, resulting in an incorrect offset calculation in gzip.GzipFile.seek().

• gh-108294 [https://github.com/python/cpython/issues/108294]: time.sleep() now raises an auditing event.

• gh-108278 [https://github.com/python/cpython/issues/108278]: Deprecate passing name, number of arguments, and the callable as keyword arguments, for the following sqlite3.Connection APIs:

  • create_function()

  • create_aggregate()

受影响的形参将在 Python 3.15 中成为仅限位置形参。

Patch by Erlend E. Aasland.

• gh-108322 [https://github.com/python/cpython/issues/108322]: Speedup NormalDist.samples() by using the inverse CDF method instead of calling random.gauss().

• gh-83417 [https://github.com/python/cpython/issues/83417]: Add the ability for venv to create a .gitignore file which causes the created environment to be ignored by Git. It is on by default when venv is called via its CLI.

• gh-105736 [https://github.com/python/cpython/issues/105736]: Harmonized the pure Python version of OrderedDict with the C version. Now, both versions set up their internal state in _new_. Formerly, the pure Python version did the set up in __init__.

• gh-108083 [https://github.com/python/cpython/issues/108083]: Fix bugs in the constructor of sqlite3.Connection and sqlite3.Connection.close() where exceptions could be leaked. Patch by Erlend E. Aasland.

• gh-107932 [https://github.com/python/cpython/issues/107932]: Fix dis module to properly report and display bytecode that do not have source lines.

• gh-105539 [https://github.com/python/cpython/issues/105539]: sqlite3 now emits an ResourceWarning if a sqlite3.Connection object is not closed explicitly. Patch by Erlend E. Aasland.

• gh-107995 [https://github.com/python/cpython/issues/107995]: The __module__ attribute on instances of functools.cached_property is now set to the name of the module in which the cached_property is defined, rather than "functools". This means that doctests in cached_property docstrings are now properly collected by the doctest module. Patch by Tyler Smart.

• gh-107963 [https://github.com/python/cpython/issues/107963]: Fix multiprocessing.set_forkserver_preload() to check the given list of modules names. Patch by Donghee Na.

• gh-106242 [https://github.com/python/cpython/issues/106242]: Fixes os.path.normpath() to handle embedded null characters without truncating the path.

• gh-81555 [https://github.com/python/cpython/issues/81555]: xml.dom.minidom now only quotes " in attributes.

• gh-50002 [https://github.com/python/cpython/issues/50002]: xml.dom.minidom now preserves whitespaces in attributes.

• gh-93057 [https://github.com/python/cpython/issues/93057]: Passing more than one positional argument to sqlite3.connect() and the sqlite3.Connection constructor is deprecated. The remaining parameters will become keyword-only in Python 3.15. Patch by Erlend E. Aasland.

• gh-76913 [https://github.com/python/cpython/issues/76913]: Add merge_extra parameter/feature to logging.LoggerAdapter

• gh-107913 [https://github.com/python/cpython/issues/107913]: Fix possible losses of errno and winerror values in OSError exceptions if they were cleared or modified by the cleanup code before creating the exception object.

• gh-107845 [https://github.com/python/cpython/issues/107845]: tarfile.data_filter() now takes the location of symlinks into account when determining their target, so it will no longer reject some valid tarballs with LinkOutsideDestinationError.

• gh-107812 [https://github.com/python/cpython/issues/107812]: Extend socket's netlink support to the FreeBSD platform.

• gh-107805 [https://github.com/python/cpython/issues/107805]: Fix signatures of module-level generated functions in turtle.

• gh-107782 [https://github.com/python/cpython/issues/107782]: pydoc is now able to show signatures which are not representable in Python, e.g. for getattr and dict.pop.

• gh-56166 [https://github.com/python/cpython/issues/56166]: Deprecate passing optional arguments maxsplit, count and flags in module-level functions re.split(), re.sub() and re.subn() as positional. They should only be passed by keyword.

• gh-107710 [https://github.com/python/cpython/issues/107710]: Speed up logging.getHandlerNames().

• gh-107715 [https://github.com/python/cpython/issues/107715]: Fix doctest.DocTestFinder.find() in presence of class names with special characters. Patch by Gertjan van Zwieten.

• gh-100814 [https://github.com/python/cpython/issues/100814]: Passing a callable object as an option value to a Tkinter image now raises the expected TclError instead of an AttributeError.

• gh-72684 [https://github.com/python/cpython/issues/72684]: Add tkinter widget methods: tk_busy_hold(), tk_busy_configure(), tk_busy_cget(), tk_busy_forget(), tk_busy_current(), and tk_busy_status().

• gh-106684 [https://github.com/python/cpython/issues/106684]: Raise ResourceWarning when asyncio.StreamWriter is not closed leading to memory leaks. Patch by Kumar Aditya.

• gh-107465 [https://github.com/python/cpython/issues/107465]: Add pathlib.Path.from_uri() classmethod.

• gh-107077 [https://github.com/python/cpython/issues/107077]: Seems that in some conditions, OpenSSL will return SSL_ERROR_SYSCALL instead of SSL_ERROR_SSL when a certification verification has failed, but the error parameters will still contain ERR_LIB_SSL and SSL_R_CERTIFICATE_VERIFY_FAILED. We are now detecting this situation and raising the appropriate ssl.SSLCertVerificationError. Patch by Pablo Galindo

• gh-107576 [https://github.com/python/cpython/issues/107576]: Fix types.get_original_bases() to only return __orig_bases__ if it is present on cls directly. Patch by James Hilton-Balfe.

• gh-105481 [https://github.com/python/cpython/issues/105481]: Remove opcode.is_pseudo, opcode.MIN_PSEUDO_OPCODE and opcode.MAX_PSEUDO_OPCODE, which were added in 3.12, were never documented and were not intended to be used externally.

• gh-105481 [https://github.com/python/cpython/issues/105481]: opcode.ENABLE_SPECIALIZATION (which was added in 3.12 but never documented or intended for external usage) is moved to opcode.ENABLESPECIALIZATION where tests can access it.

• gh-107396 [https://github.com/python/cpython/issues/107396]: tarfiles; Fixed use before assignment of self.exception for gzip decompression

• gh-107409 [https://github.com/python/cpython/issues/107409]: Set __wrapped__ attribute in reprlib.recursive_repr().

• gh-107406 [https://github.com/python/cpython/issues/107406]: Implement new _repr_() method for struct.Struct. Now it returns Struct().

• gh-107369 [https://github.com/python/cpython/issues/107369]: Optimize textwrap.indent(). It is ~30% faster for large input. Patch by Inada Naoki.

• gh-78722 [https://github.com/python/cpython/issues/78722]: Fix issue where pathlib.Path.iterdir() did not raise OSError until iterated.

• gh-105578 [https://github.com/python/cpython/issues/105578]: Deprecate typing.AnyStr in favor of the new Type Parameter syntax. See PEP 695.

• gh-62519 [https://github.com/python/cpython/issues/62519]: Make gettext.pgettext() search plural definitions when translation is not found.

• gh-107089 [https://github.com/python/cpython/issues/107089]: Shelves opened with shelve.open() have a much faster clear() method. Patch by James Cave.

• gh-82500 [https://github.com/python/cpython/issues/82500]: Fix overflow on 32-bit systems with asyncio os.sendfile() implementation.

• gh-83006 [https://github.com/python/cpython/issues/83006]: Document behavior of shutil.disk_usage() for non-mounted filesystems on Unix.

• gh-65495 [https://github.com/python/cpython/issues/65495]: Use lowercase mail from and rcpt to in smptlib.SMTP.

• gh-106186 [https://github.com/python/cpython/issues/106186]: Do not report MultipartInvariantViolationDefect defect when the email.parser.Parser class is used to parse emails with headersonly=True.

• gh-105002 [https://github.com/python/cpython/issues/105002]: Fix invalid result from PurePath.relative_to() method when attempting to walk a ".." segment in other with walk_up enabled. A ValueError exception is now raised in this case.

• gh-106739 [https://github.com/python/cpython/issues/106739]: Add the rtype_cache to the warning message (as an addition to the type of leaked objects and the number of leaked objects already included in the message) to make debugging leaked objects easier when the multiprocessing resource tracker process finds leaked objects at shutdown. This helps more quickly identify what was leaked and/or why the leaked object was not properly cleaned up.

• gh-106751 [https://github.com/python/cpython/issues/106751]: Optimize SelectSelector.select() for many iteration case. Patch By Donghee Na.

• gh-106751 [https://github.com/python/cpython/issues/106751]: Optimize _PollLikeSelector.select() for many iteration case.

• gh-106751 [https://github.com/python/cpython/issues/106751]: Optimize KqueueSelector.select() for many iteration case. Patch By Donghee Na.

• gh-106831 [https://github.com/python/cpython/issues/106831]: Fix potential missing NULL check of d2i_SSL_SESSION result in _ssl.c.

• gh-105481 [https://github.com/python/cpython/issues/105481]: The various opcode lists in the dis module are now generated from bytecodes.c instead of explicitly constructed in opcode.py.

• gh-106727 [https://github.com/python/cpython/issues/106727]: Make inspect.getsource() smarter for class for same name definitions

• gh-106789 [https://github.com/python/cpython/issues/106789]: Remove import of pprint from sysconfig.

• gh-105726 [https://github.com/python/cpython/issues/105726]: Added __slots__ to contextlib.AbstractContextManager and contextlib.AbstractAsyncContextManager so that child classes can use __slots__.

• gh-106774 [https://github.com/python/cpython/issues/106774]: Update the bundled copy of pip to version 23.2.1.

• gh-106751 [https://github.com/python/cpython/issues/106751]: selectors: Optimize EpollSelector.select() code by moving some code outside of the loop.

• gh-106752 [https://github.com/python/cpython/issues/106752]: Fixed several bugs in zipfile.Path, including: in zipfile.Path.match(), Windows separators are no longer honored (and never were meant to be); Fixed name/suffix/suffixes/stem operations when no filename is present and the Path is not at the root of the zipfile; Reworked glob for performance and more correct matching behavior.

• gh-105293 [https://github.com/python/cpython/issues/105293]: Remove call to SSL_CTXsetsession_id_context during client side context creation in the ssl module.

• gh-106734 [https://github.com/python/cpython/issues/106734]: Disable tab completion in multiline mode of pdb

• gh-105481 [https://github.com/python/cpython/issues/105481]: Expose opcode metadata through _opcode.

• gh-106670 [https://github.com/python/cpython/issues/106670]: Add the new exceptions command to the Pdb debugger. It makes it possible to move between chained exceptions when using post mortem debugging.

• gh-106602 [https://github.com/python/cpython/issues/106602]: Add copy and deepcopy in enum

• gh-106664 [https://github.com/python/cpython/issues/106664]: selectors: Add _SelectorMapping.get() method and optimize _SelectorMapping.__getitem__().

• gh-106628 [https://github.com/python/cpython/issues/106628]: Speed up parsing of emails by about 20% by not compiling a new regular expression for every single email.

• gh-89427 [https://github.com/python/cpython/issues/89427]: Set the environment variable VIRTUAL_ENV_PROMPT at venv activation, even when VIRTUAL_ENV_DISABLE_PROMPT is set.

• gh-106530 [https://github.com/python/cpython/issues/106530]: Revert a change to colorsys.rgb_to_hls() that caused division by zero for certain almost-white inputs. Patch by Terry Jan Reedy.

• gh-106584 [https://github.com/python/cpython/issues/106584]: Fix exit code for unittest if all tests are skipped. Patch by Egor Eliseev.

• gh-106566 [https://github.com/python/cpython/issues/106566]: Optimize (?!) (pattern which always fails) in regular expressions.

• gh-106554 [https://github.com/python/cpython/issues/106554]: selectors: Reduce Selector overhead by using a dict.get() to lookup file descriptors.

• gh-106558 [https://github.com/python/cpython/issues/106558]: Remove ref cycle in callers of convert_to_error() by deleting result from scope in a finally block.

• gh-100502 [https://github.com/python/cpython/issues/100502]: Add pathlib.PurePath.pathmod class attribute that stores the implementation of os.path used for low-level path operations: either posixpath or ntpath.

• gh-106527 [https://github.com/python/cpython/issues/106527]: Reduce overhead to add and remove asyncio readers and writers.

• gh-106524 [https://github.com/python/cpython/issues/106524]: Fix crash in _sre.template() with templates containing invalid group indices.

• gh-106531 [https://github.com/python/cpython/issues/106531]: Removed _legacy and the names it provided from importlib.resources: Resource, contents, is_resource, open_binary, open_text, path, read_binary, and read_text.

• gh-106052 [https://github.com/python/cpython/issues/106052]: re module: fix the matching of possessive quantifiers in the case of a subpattern containing backtracking.

• gh-106510 [https://github.com/python/cpython/issues/106510]: Improve debug output for atomic groups in regular expressions.

• gh-106503 [https://github.com/python/cpython/issues/106503]: Fix ref cycle in asyncio._SelectorSocketTransport by removing writeready in close.

• gh-105497 [https://github.com/python/cpython/issues/105497]: Fix flag mask inversion when unnamed flags exist.

• gh-90876 [https://github.com/python/cpython/issues/90876]: Prevent multiprocessing.spawn from failing to import in environments where sys.executable is None. This regressed in 3.11 with the addition of support for pathlike objects in multiprocessing.

• gh-106403 [https://github.com/python/cpython/issues/106403]: Instances of typing.TypeVar, typing.ParamSpec, typing.ParamSpecArgs, typing.ParamSpecKwargs, and typing.TypeVarTuple once again support weak references, fixing a regression introduced in Python 3.12.0 beta 1. Patch by Jelle Zijlstra.

• gh-89812 [https://github.com/python/cpython/issues/89812]: Add private pathlib._PathBase class, which provides experimental support for virtual filesystems, and may be made public in a future version of Python.

• gh-106292 [https://github.com/python/cpython/issues/106292]: Check for an instance-dict cached value in the _get_() method of functools.cached_property(). This better matches the pre-3.12 behavior and improves compatibility for users subclassing functools.cached_property() and adding a _set_() method.

• gh-106350 [https://github.com/python/cpython/issues/106350]: Detect possible memory allocation failure in the libtommath function mp_init() used by the _tkinter module.

• gh-106330 [https://github.com/python/cpython/issues/106330]: Fix incorrect matching of empty paths in pathlib.PurePath.match(). This bug was introduced in Python 3.12.0 beta 1.

• gh-106309 [https://github.com/python/cpython/issues/106309]: Deprecate typing.no_type_check_decorator(). No major type checker ever added support for this decorator. Patch by Alex Waygood.

• gh-102541 [https://github.com/python/cpython/issues/102541]: Make pydoc.doc() catch bad module ImportError when output stream is not None.

• gh-106263 [https://github.com/python/cpython/issues/106263]: Fix crash when calling repr with a manually constructed SignalDict object. Patch by Charlie Zhao.

• gh-106236 [https://github.com/python/cpython/issues/106236]: Replace assert statements with raise RuntimeError in threading, so that _DummyThread cannot be joined even with -OO.

• gh-106238 [https://github.com/python/cpython/issues/106238]: Fix rare concurrency bug in lock acquisition by the logging package.

• gh-106152 [https://github.com/python/cpython/issues/106152]: Added PY_THROW event hook for cProfile for generators

• gh-106075 [https://github.com/python/cpython/issues/106075]: Added asyncio.taskgroups.__all__ to asyncio.__all__ for export in star imports.

• gh-104527 [https://github.com/python/cpython/issues/104527]: Zipapp will now skip over appending an archive to itself.

• gh-106046 [https://github.com/python/cpython/issues/106046]: Improve the error message from os.fspath() if called on an object where __fspath__ is set to None. Patch by Alex Waygood.

• gh-105987 [https://github.com/python/cpython/issues/105987]: Fix crash due to improper reference counting in asyncio eager task factory internal routines.

• gh-105974 [https://github.com/python/cpython/issues/105974]: Fix bug where a typing.Protocol class that had one or more non-callable members would raise TypeError when issubclass() was called against it, even if it defined a custom __subclasshook__ method. The behaviour in Python 3.11 and lower — which has now been restored — was not to raise TypeError in these situations if a custom __subclasshook__ method was defined. Patch by Alex Waygood.

• gh-96145 [https://github.com/python/cpython/issues/96145]: Reverted addition of json.AttrDict.

• gh-89812 [https://github.com/python/cpython/issues/89812]: Add pathlib.UnsupportedOperation, which is raised instead of NotImplementedError when a path operation isn't supported.

• gh-105808 [https://github.com/python/cpython/issues/105808]: Fix a regression introduced in gh-101251 [https://github.com/python/cpython/issues/101251] for 3.12, causing gzip.GzipFile.flush() to not flush the compressor (nor pass along the zip_mode argument).

• gh-105481 [https://github.com/python/cpython/issues/105481]: stack_effect() no longer raises an exception if an oparg is provided for an opcode that doesn't use its arg, or when it is not provided for an opcode that does use it. In the latter case, the stack effect is returned for oparg=0.

• gh-104799 [https://github.com/python/cpython/issues/104799]: Enable ast.unparse() to unparse function and class definitions created without the new type_params field from PEP 695 [https://peps.python.org/pep-0695/]. Patch by Jelle Zijlstra.

• gh-105793 [https://github.com/python/cpython/issues/105793]: Add follow_symlinks keyword-only argument to pathlib.Path.is_dir() and is_file(), defaulting to True.

• gh-105570 [https://github.com/python/cpython/issues/105570]: Deprecate two methods of creating typing.TypedDict classes with 0 fields using the functional syntax: TD = TypedDict("TD") and TD = TypedDict("TD", None). Both will be disallowed in Python 3.15. To create a TypedDict class with 0 fields, either use class TD(TypedDict): pass or TD = TypedDict("TD", {}).

• gh-105745 [https://github.com/python/cpython/issues/105745]: Fix webbrowser.Konqueror.open method.

• gh-105733 [https://github.com/python/cpython/issues/105733]: ctypes: Deprecate undocumented ctypes.SetPointerType() and ctypes.ARRAY() functions. Patch by Victor Stinner.

• gh-105687 [https://github.com/python/cpython/issues/105687]: Remove deprecated re.template, re.T, re.TEMPLATE, sre_constans.SRE_FLAG_TEMPLATE.

• gh-105684 [https://github.com/python/cpython/issues/105684]: Supporting asyncio.Task.set_name() is now mandatory for third party task implementations. The undocumented settask_name() function (deprecated since 3.8) has been removed. Patch by Kumar Aditya.

• gh-105375 [https://github.com/python/cpython/issues/105375]: Fix a bug in UnpicklerSetInputStream() where an exception could end up being overwritten in case of failure.

• gh-105626 [https://github.com/python/cpython/issues/105626]: Change the default return value of http.client.HTTPConnection.get_proxy_response_headers() to be None and not {}.

• gh-105375 [https://github.com/python/cpython/issues/105375]: Fix bugs in sys where exceptions could end up being overwritten because of deferred error handling.

• gh-105605 [https://github.com/python/cpython/issues/105605]: Harden pyexpat error handling during module initialisation to prevent exceptions from possibly being overwritten, and objects from being dereferenced twice.

• gh-105375 [https://github.com/python/cpython/issues/105375]: Fix bug in decimal where an exception could end up being overwritten.

• gh-105375 [https://github.com/python/cpython/issues/105375]: Fix bugs in _datetime where exceptions could be overwritten in case of module initialisation failure.

• gh-105375 [https://github.com/python/cpython/issues/105375]: Fix bugs in _ssl initialisation which could lead to leaked references and overwritten exceptions.

• gh-105375 [https://github.com/python/cpython/issues/105375]: Fix a bug in array.array where an exception could end up being overwritten.

• gh-105375 [https://github.com/python/cpython/issues/105375]: Fix bugs in _ctypes where exceptions could end up being overwritten.

• gh-105375 [https://github.com/python/cpython/issues/105375]: Fix a bug in the posix module where an exception could be overwritten.

• gh-105375 [https://github.com/python/cpython/issues/105375]: Fix bugs in _elementtree where exceptions could be overwritten.

• gh-105375 [https://github.com/python/cpython/issues/105375]: Fix bugs in zoneinfo where exceptions could be overwritten.

• gh-105375 [https://github.com/python/cpython/issues/105375]: Fix bugs in errno where exceptions could be overwritten.

• gh-105566 [https://github.com/python/cpython/issues/105566]: Deprecate creating a typing.NamedTuple class using keyword arguments to denote the fields (NT = NamedTuple("NT", x=int, y=str)). This will be disallowed in Python 3.15. Use the class-based syntax or the functional syntax instead.

Two methods of creating NamedTuple classes with 0 fields using the functional syntax are also deprecated, and will be disallowed in Python 3.15: NT = NamedTuple("NT") and NT = NamedTuple("NT", None). To create a NamedTuple class with 0 fields, either use class NT(NamedTuple): pass or NT = NamedTuple("NT", []).

• gh-105545 [https://github.com/python/cpython/issues/105545]: Remove deprecated in 3.11 webbrowser.MacOSXOSAScript._name attribute.

• gh-105497 [https://github.com/python/cpython/issues/105497]: Fix flag inversion when alias/mask members exist.

• gh-105509 [https://github.com/python/cpython/issues/105509]: typing.Annotated is now implemented as an instance of typing._SpecialForm rather than a class. This should have no user-facing impact for users of the typing module public API.

• gh-105375 [https://github.com/python/cpython/issues/105375]: Fix bugs in pickle where exceptions could be overwritten.

• gh-70303 [https://github.com/python/cpython/issues/70303]: Emit FutureWarning from pathlib.Path.glob() and rglob() if the given pattern ends with "**". In a future Python release, patterns with this ending will match both files and directories. Add a trailing slash to only match directories.

• gh-105375 [https://github.com/python/cpython/issues/105375]: Fix a bug in sqlite3 where an exception could be overwritten in the collation callback.

• gh-105382 [https://github.com/python/cpython/issues/105382]: Remove cafile, capath and cadefault parameters of the urllib.request.urlopen() function, deprecated in Python 3.6. Patch by Victor Stinner.

• gh-105376 [https://github.com/python/cpython/issues/105376]: logging: Remove undocumented and untested Logger.warn() and LoggerAdapter.warn() methods and logging.warn() function. Deprecated since Python 3.3, they were aliases to the logging.Logger.warning() method, logging.LoggerAdapter.warning() method and logging.warning() function. Patch by Victor Stinner.

• gh-105332 [https://github.com/python/cpython/issues/105332]: Revert pickling method from by-name back to by-value.

• gh-104554 [https://github.com/python/cpython/issues/104554]: Add RTSPS scheme support in urllib.parse

• gh-105292 [https://github.com/python/cpython/issues/105292]: Add option to traceback.format_exception_only() to recurse into the nested exception of a BaseExceptionGroup.

• gh-105280 [https://github.com/python/cpython/issues/105280]: Fix bug where isinstance([], collections.abc.Mapping) could evaluate to True if garbage collection happened at the wrong time. The bug was caused by changes to the implementation of typing.Protocol in Python 3.12.

• gh-80480 [https://github.com/python/cpython/issues/80480]: array: Add 'w' typecode that represents Py_UCS4.

• gh-105239 [https://github.com/python/cpython/issues/105239]: Fix longstanding bug where issubclass(object, typing.Protocol) would evaluate to True in some edge cases. Patch by Alex Waygood.

• gh-104310 [https://github.com/python/cpython/issues/104310]: In the beta 1 release we added a utility function for extension module authors, to use when testing their module for support in multiple interpreters or under a per-interpreter GIL. The name of that function has changed from allowing_all_extensions to incompatibleextension_module_restrictions. The default for the "disable_check" argument has change from True to False, to better match the new function name.

• gh-105080 [https://github.com/python/cpython/issues/105080]: Fixed inconsistent signature on derived classes for inspect.signature()

• gh-105144 [https://github.com/python/cpython/issues/105144]: Fix a recent regression in the typing module. The regression meant that doing class Foo(X, typing.Protocol), where X was a class that had abc.ABCMeta as its metaclass, would then cause subsequent isinstance(1, X) calls to erroneously raise TypeError. Patch by Alex Waygood.

• gh-62948 [https://github.com/python/cpython/issues/62948]: The io.IOBase finalizer now logs the close() method errors with sys.unraisablehook. Previously, errors were ignored silently by default, and only logged in Python Development Mode or on Python built on debug mode. Patch by Victor Stinner.

• gh-105096 [https://github.com/python/cpython/issues/105096]: wave: Deprecate the getmark(), setmark() and getmarkers() methods of the wave.Wave_read and wave.Wave_write classes. They will be removed in Python 3.15. Patch by Victor Stinner.

• gh-104992 [https://github.com/python/cpython/issues/104992]: Remove the untested and undocumented unittest.TestProgram.usageExit() method, deprecated in Python 3.11. Patch by Hugo van Kemenade.

• gh-104996 [https://github.com/python/cpython/issues/104996]: Improve performance of pathlib.PurePath initialisation by deferring joining of paths when multiple arguments are given.

• gh-101588 [https://github.com/python/cpython/issues/101588]: Deprecate undocumented copy/deepcopy/pickle support for itertools.

• gh-103631 [https://github.com/python/cpython/issues/103631]: Fix pathlib.PurePosixPath(pathlib.PureWindowsPath(…)) not converting path separators to restore 3.11 compatible behavior.

• gh-104947 [https://github.com/python/cpython/issues/104947]: Make comparisons between pathlib.PureWindowsPath objects consistent across Windows and Posix to match 3.11 behavior.

• gh-104773 [https://github.com/python/cpython/issues/104773]: PEP 594 [https://peps.python.org/pep-0594/]: Remove the audioop module, deprecated in Python 3.11. Patch by Victor Stinner.

• gh-104773 [https://github.com/python/cpython/issues/104773]: PEP 594 [https://peps.python.org/pep-0594/]: Remove the aifc module, deprecated in Python 3.11. Patch by Victor Stinner.

• gh-104773 [https://github.com/python/cpython/issues/104773]: PEP 594 [https://peps.python.org/pep-0594/]: Remove the uu module, deprecated in Python 3.11. Patch by Victor Stinner.

• gh-104935 [https://github.com/python/cpython/issues/104935]: Fix bugs with the interaction between typing.runtime_checkable() and typing.Generic that were introduced by the PEP 695 [https://peps.python.org/pep-0695/] implementation. Patch by Jelle Zijlstra.

• gh-104773 [https://github.com/python/cpython/issues/104773]: PEP 594 [https://peps.python.org/pep-0594/]: Remove the crypt module and its private _crypt extension, deprecated in Python 3.11. Patch by Victor Stinner.

• gh-104773 [https://github.com/python/cpython/issues/104773]: PEP 594 [https://peps.python.org/pep-0594/]: Remove the nis module, deprecated in Python 3.11. Patch by Victor Stinner.

• gh-104898 [https://github.com/python/cpython/issues/104898]: Add missing __slots__ to os.PathLike.

• gh-104773 [https://github.com/python/cpython/issues/104773]: PEP 594 [https://peps.python.org/pep-0594/]: Remove the xdrlib module, deprecated in Python 3.11. Patch by Victor Stinner.

• gh-104773 [https://github.com/python/cpython/issues/104773]: PEP 594 [https://peps.python.org/pep-0594/]: Remove the nntplib module, deprecated in Python 3.11. Patch by Victor Stinner.

• gh-104886 [https://github.com/python/cpython/issues/104886]: Remove the undocumented configparser.LegacyInterpolation class, deprecated in the docstring since Python 3.2, and with a deprecation warning since Python 3.11. Patch by Hugo van Kemenade.

• gh-104786 [https://github.com/python/cpython/issues/104786]: Remove kwargs-based typing.TypedDict creation

• gh-104876 [https://github.com/python/cpython/issues/104876]: Remove the turtle.RawTurtle.settiltangle() method, deprecated in docs since Python 3.1 and with a deprecation warning since Python 3.11. Patch by Hugo van Kemenade.

• gh-104773 [https://github.com/python/cpython/issues/104773]: PEP 594 [https://peps.python.org/pep-0594/]: Removed the msilib package, deprecated in Python 3.11.

• gh-104773 [https://github.com/python/cpython/issues/104773]: PEP 594 [https://peps.python.org/pep-0594/]: Remove the spwd module, deprecated in Python 3.11: the python-pam [https://pypi.org/project/python-pam/] project can be used instead. Patch by Victor Stinner.

• gh-75552 [https://github.com/python/cpython/issues/75552]: Removed the tkinter.tix module, deprecated since Python 3.6.

• gh-104773 [https://github.com/python/cpython/issues/104773]: PEP 594 [https://peps.python.org/pep-0594/]: Remove the chunk module, deprecated in Python 3.11. Patch by Victor Stinner.

• gh-104773 [https://github.com/python/cpython/issues/104773]: PEP 594 [https://peps.python.org/pep-0594/]: Remove the mailcap module, deprecated in Python 3.11. Patch by Victor Stinner.

• gh-104773 [https://github.com/python/cpython/issues/104773]: PEP 594 [https://peps.python.org/pep-0594/]: Remove the sunau module, deprecated in Python 3.11. Patch by Victor Stinner.

• gh-104780 [https://github.com/python/cpython/issues/104780]: PEP 594 [https://peps.python.org/pep-0594/]: Remove the ossaudiodev module, deprecated in Python 3.11. Patch Victor Stinner.

• gh-104773 [https://github.com/python/cpython/issues/104773]: PEP 594 [https://peps.python.org/pep-0594/]: Remove the pipes module, deprecated in Python 3.11. Patch by Victor Stinner.

• gh-104873 [https://github.com/python/cpython/issues/104873]: Add typing.get_protocol_members() to return the set of members defining a typing.Protocol. Add typing.is_protocol() to check whether a class is a typing.Protocol. Patch by Jelle Zijlstra.

• gh-104874 [https://github.com/python/cpython/issues/104874]: Document the __name__ and __supertype__ attributes of typing.NewType. Patch by Jelle Zijlstra.

• gh-104835 [https://github.com/python/cpython/issues/104835]: Removed the following unittest functions, deprecated in Python 3.11:

  • unittest.findTestCases()

  • unittest.makeSuite()

  • unittest.getTestCaseNames()

请改用 TestLoader 方法:

• unittest.TestLoader.loadTestsFromModule()

• unittest.TestLoader.loadTestsFromTestCase()

• unittest.TestLoader.getTestCaseNames()

Patch by Hugo van Kemenade.

• gh-104804 [https://github.com/python/cpython/issues/104804]: Remove the untested and undocumented webbrowser MacOSX class, deprecated in Python 3.11. Patch by Hugo van Kemenade.

• gh-83863 [https://github.com/python/cpython/issues/83863]: Support for using pathlib.Path objects as context managers has been removed. Before Python 3.9, exiting the context manager marked a path as "closed", which caused some (but not all!) methods to raise when called. Since Python 3.9, using a path as a context manager does nothing.

• gh-104799 [https://github.com/python/cpython/issues/104799]: Adjust the location of the (see PEP 695 [https://peps.python.org/pep-0695/]) type_params field on ast.ClassDef, ast.AsyncFunctionDef, and ast.FunctionDef to better preserve backward compatibility. Patch by Jelle Zijlstra

• gh-104797 [https://github.com/python/cpython/issues/104797]: Allow typing.Protocol classes to inherit from collections.abc.Buffer. Patch by Jelle Zijlstra.

• gh-104783 [https://github.com/python/cpython/issues/104783]: Remove locale.resetlocale() function deprecated in Python 3.11. Patch by Victor Stinner.

• gh-104780 [https://github.com/python/cpython/issues/104780]: Remove the 2to3 program and the lib2to3 module, deprecated in Python 3.11. Patch by Victor Stinner.

• gh-104773 [https://github.com/python/cpython/issues/104773]: PEP 594 [https://peps.python.org/pep-0594/]: Remove the telnetlib module, deprecated in Python 3.11. Patch by Victor Stinner.

• gh-104773 [https://github.com/python/cpython/issues/104773]: PEP 594 [https://peps.python.org/pep-0594/]: Remove the imghdr module, deprecated in Python 3.11. Patch by Victor Stinner.

• gh-104773 [https://github.com/python/cpython/issues/104773]: PEP 594 [https://peps.python.org/pep-0594/]: Remove the cgi and cgitb modules, deprecated in Python 3.11. Patch by Victor Stinner.

• gh-104773 [https://github.com/python/cpython/issues/104773]: PEP 594 [https://peps.python.org/pep-0594/]: Remove the sndhdr module, deprecated in Python 3.11. Patch by Victor Stinner.

• gh-104372 [https://github.com/python/cpython/issues/104372]: On Linux where subprocess can use the vfork() syscall for faster spawning, prevent the parent process from blocking other threads by dropping the GIL while it waits for the vfork'ed child process exec() outcome. This prevents spawning a binary from a slow filesystem from blocking the rest of the application.

• gh-99108 [https://github.com/python/cpython/issues/99108]: We now release the GIL around builtin hashlib computations of reasonable size for the SHA families and MD5 hash functions, matching what our OpenSSL backed hash computations already does.

• gh-102613 [https://github.com/python/cpython/issues/102613]: Improve performance of pathlib.Path.glob() when expanding a pattern with a non-terminal "**" component by filtering walked paths through a regular expression, rather than calling os.scandir() more than once on each directory.

• gh-104399 [https://github.com/python/cpython/issues/104399]: Prepare the _tkinter module for building with Tcl 9.0 and future libtommath by replacing usage of deprecated functions mp_to_unsigned_bin_n() and mp_unsigned_bin_size() when necessary.

• gh-102676 [https://github.com/python/cpython/issues/102676]: Add fields start_offset, cache_offset, end_offset, baseopname, baseopcode, jump_target and oparg to dis.Instruction.

• gh-103558 [https://github.com/python/cpython/issues/103558]: Fixed parent argument validation mechanism of argparse. Improved test coverage.

• gh-103464 [https://github.com/python/cpython/issues/103464]: Provide helpful usage messages when parsing incorrect pdb commands.

• gh-103384 [https://github.com/python/cpython/issues/103384]: Generalize the regex pattern BaseConfigurator.INDEX_PATTERN to allow spaces and non-alphanumeric characters in keys.

• gh-103124 [https://github.com/python/cpython/issues/103124]: Added multiline statement support for pdb

• gh-101162 [https://github.com/python/cpython/issues/101162]: Forbid using builtins.issubclass() with types.GenericAlias as the first argument.

• gh-103200 [https://github.com/python/cpython/issues/103200]: Fix cache repopulation semantics of zipimport.invalidate_caches(). The cache is now repopulated upon retrieving files with an invalid cache, not when the cache is invalidated.

• gh-100061 [https://github.com/python/cpython/issues/100061]: Fix a bug that causes wrong matches for regular expressions with possessive qualifier.

• gh-77609 [https://github.com/python/cpython/issues/77609]: Add follow_symlinks argument to pathlib.Path.glob() and rglob(), defaulting to false.

• gh-102541 [https://github.com/python/cpython/issues/102541]: Hide traceback in help() prompt, when import failed.

• gh-102120 [https://github.com/python/cpython/issues/102120]: Added a stream mode to tarfile that allows for reading archives without caching info about the inner files.

• gh-102029 [https://github.com/python/cpython/issues/102029]: Deprecate passing any arguments to threading.RLock().

• gh-88233 [https://github.com/python/cpython/issues/88233]: Refactored zipfile._strip_extra to use higher level abstractions for extras instead of a heavy-state loop.

• gh-102024 [https://github.com/python/cpython/issues/102024]: Reduce calls of idlesemaphore.release() in concurrent.futures.thread._worker().

• gh-73435 [https://github.com/python/cpython/issues/73435]: Add support for recursive wildcards in pathlib.PurePath.match().

• gh-84867 [https://github.com/python/cpython/issues/84867]: unittest.TestLoader no longer loads test cases from exact unittest.TestCase and unittest.FunctionTestCase classes.

• gh-99203 [https://github.com/python/cpython/issues/99203]: Restore following CPython <= 3.10.5 behavior of shutil.make_archive(): do not create an empty archive if root_dir is not a directory, and, in that case, raise FileNotFoundError or NotADirectoryError regardless of format choice. Beyond the brought-back behavior, the function may now also raise these exceptions in dry_run mode.

• gh-80480 [https://github.com/python/cpython/issues/80480]: Emit DeprecationWarning for array's 'u' type code, deprecated in docs since Python 3.3.

• gh-94924 [https://github.com/python/cpython/issues/94924]: unittest.mock.create_autospec() now properly returns coroutine functions compatible with inspect.iscoroutinefunction()

• gh-94777 [https://github.com/python/cpython/issues/94777]: Fix hanging multiprocessing ProcessPoolExecutor when a child process crashes while data is being written in the call queue.

• gh-92871 [https://github.com/python/cpython/issues/92871]: Remove the typing.io and typing.re namespaces, deprecated since Python 3.8. All items are still available from the main typing module.

• bpo-43633 [https://bugs.python.org/issue?@action=redirect&bpo=43633]: Improve the textual representation of IPv4-mapped IPv6 addresses ( RFC 4291 [https://datatracker.ietf.org/doc/html/rfc4291.html] Sections 2.2, 2.5.5.2) in ipaddress. Patch by Oleksandr Pavliuk.

• bpo-44850 [https://bugs.python.org/issue?@action=redirect&bpo=44850]: Improve performance of operator.methodcaller() using the PEP 590 [https://peps.python.org/pep-0590/] vectorcall convention. Patch by Anthony Lee and Pieter Eendebak.

• bpo-44185 [https://bugs.python.org/issue?@action=redirect&bpo=44185]: unittest.mock.mock_open() will call the close() method of the file handle mock when it is exiting from the context manager. Patch by Samet Yaslan.

• bpo-40988 [https://bugs.python.org/issue?@action=redirect&bpo=40988]: Improve performance of functools.singledispatchmethod by caching the generated dispatch wrapper. Optimization suggested by frederico. Patch by @mental32, Alex Waygood and Pieter Eendebak.

• bpo-41768 [https://bugs.python.org/issue?@action=redirect&bpo=41768]: unittest.mock speccing no longer calls class properties. Patch by Melanie Witt.

• bpo-18319 [https://bugs.python.org/issue?@action=redirect&bpo=18319]: Ensure gettext(msg) retrieve translations even if a plural form exists. In other words: gettext(msg) == ngettext(msg, '', 1).

• bpo-17013 [https://bugs.python.org/issue?@action=redirect&bpo=17013]: Add ThreadingMock to unittest.mock that can be used to create Mock objects that can wait until they are called. Patch by Karthikeyan Singaravelan and Mario Corchero.