库

• gh-122400 [https://github.com/python/cpython/issues/122400]: Handle ValueErrors raised by os.stat() in filecmp.dircmp and filecmp.cmpfiles(). Patch by Bénédikt Tran.

• gh-122311 [https://github.com/python/cpython/issues/122311]: Fix some error messages in pickle.

• gh-122332 [https://github.com/python/cpython/issues/122332]: Fixed segfault with asyncio.Task.get_coro() when using an eager task factory.

• gh-105733 [https://github.com/python/cpython/issues/105733]: ctypes.ARRAY() is now soft deprecated: it no longer emits deprecation warnings and is not scheduled for removal.

• gh-122087 [https://github.com/python/cpython/issues/122087]: Restore inspect.ismethoddescriptor() and inspect.isroutine() returning False for functools.partial objects.

• gh-122170 [https://github.com/python/cpython/issues/122170]: Handle ValueErrors raised by os.stat() in linecache. Patch by Bénédikt Tran.

• gh-82951 [https://github.com/python/cpython/issues/82951]: Serializing objects with complex __qualname__ (such as unbound methods and nested classes) by name no longer involves serializing parent objects by value in pickle protocols < 4.

• gh-113785 [https://github.com/python/cpython/issues/113785]: csv now correctly parses numeric fields (when used with csv.QUOTE_NONNUMERIC or csv.QUOTE_STRINGS) which start with an escape character.

• gh-122088 [https://github.com/python/cpython/issues/122088]: @warnings.deprecated now copies the coroutine status of functions and methods so that inspect.iscoroutinefunction() returns the correct result.

• gh-120930 [https://github.com/python/cpython/issues/120930]: Fixed a bug introduced by gh-92081 [https://github.com/python/cpython/issues/92081] that added an incorrect extra blank to encoded words occurring in wrapped headers.

• gh-121474 [https://github.com/python/cpython/issues/121474]: Fix missing sanity check for parties arg in threading.Barrier constructor. Patch by Clinton Christian (pygeek).

• gh-120289 [https://github.com/python/cpython/issues/120289]: Fixed the use-after-free issue in cProfile by disallowing disable() and clear() in external timers.

IDLE

• gh-122482 [https://github.com/python/cpython/issues/122482]: Change About IDLE to direct users to discuss.python.org instead of the now unused idle-dev email and mailing list.

核心与内置函数

• gh-116090 [https://github.com/python/cpython/issues/116090]: Fix an issue in JIT builds that prevented some for loops from correctly firing RAISE monitoring events.

• gh-122208 [https://github.com/python/cpython/issues/122208]: Dictionary watchers now only deliver the PyDict_EVENT_ADDED event when the insertion is in a known good state to succeed.

• gh-122300 [https://github.com/python/cpython/issues/122300]: Preserve AST nodes for fstring with single-element format specifiers. Patch by Pablo Galindo

• gh-120906 [https://github.com/python/cpython/issues/120906]: frame.f_locals now supports arbitrary hashable objects as keys.

• gh-122029 [https://github.com/python/cpython/issues/122029]: Emit c_call events in sys.setprofile() when a PyMethodObject pointing to a PyCFunction is called.

• gh-122026 [https://github.com/python/cpython/issues/122026]: Fix a bug that caused the tokenizer to not correctly identify mismatched parentheses inside fstrings in some situations. Patch by Pablo Galindo

• gh-118934 [https://github.com/python/cpython/issues/118934]: Make PyEval_GetLocals return borrowed reference

C API

• gh-116622 [https://github.com/python/cpython/issues/116622]: Make PyObject_Print work around a bug in Android and OpenBSD which prevented it from throwing an exception when trying to write to a readonly stream.

• gh-121489 [https://github.com/python/cpython/issues/121489]: Export private PyBytesJoin() again.

构建

• gh-120522 [https://github.com/python/cpython/issues/120522]: Added a --with-app-store-compliance option to patch out known issues with macOS/iOS App Store review processes.

Python 3.13.0 beta 4

Release date: 2024-07-18

测试

• gh-121084 [https://github.com/python/cpython/issues/121084]: Fix test_typing random leaks. Clear typing ABC caches when running tests for refleaks (-R option): call abccaches_clear() on typing abstract classes and their subclasses. Patch by Victor Stinner.

• gh-121160 [https://github.com/python/cpython/issues/121160]: Add a test for readline.set_history_length(). Note that this test may fail on readline libraries.

• gh-121200 [https://github.com/python/cpython/issues/121200]: Fix test_expanduser_pwd2() of test_posixpath. Call getpwnam() to get pw_dir, since it can be different than getpwall() pw_dir. Patch by Victor Stinner.

• gh-121188 [https://github.com/python/cpython/issues/121188]: When creating the JUnit XML file, regrtest now escapes characters which are invalid in XML, such as the chr(27) control character used in ANSI escape sequences. Patch by Victor Stinner.

库

• gh-57141 [https://github.com/python/cpython/issues/57141]: The shallow argument to filecmp.dircmp (new in Python 3.13) is now keyword-only.

• gh-121245 [https://github.com/python/cpython/issues/121245]: Simplify handling of the history file in site.register_readline() helper. The CAN_USE_PYREPL variable now will be initialized, when imported. Patch by Sergey B Kirpichev.

• gh-121332 [https://github.com/python/cpython/issues/121332]: Fix constructor of ast nodes with custom _attributes. Previously, passing custom attributes would raise a DeprecationWarning. Passing arguments to the constructor that are not in _fields or _attributes remains deprecated. Patch by Jelle Zijlstra.

• gh-121279 [https://github.com/python/cpython/issues/121279]: Avoid NameError for the warnings module when accessing the depracated atributes of the importlib.abc module.

• gh-121245 [https://github.com/python/cpython/issues/121245]: Fix a bug in the handling of the command history of the new REPL that caused the history file to be wiped at REPL exit.

• gh-87744 [https://github.com/python/cpython/issues/87744]: Fix waitpid race while calling send_signal() in asyncio. Patch by Kumar Aditya.

• gh-121018 [https://github.com/python/cpython/issues/121018]: Fixed other issues where argparse.ArgumentParser did not honor exit_on_error=False.

• gh-120678 [https://github.com/python/cpython/issues/120678]: Fix regression in the new REPL that meant that globals from files passed using the -i argument would not be included in the REPL's global namespace. Patch by Alex Waygood.

• gh-120782 [https://github.com/python/cpython/issues/120782]: Fix wrong references of the datetime types after reloading the module.

• gh-120713 [https://github.com/python/cpython/issues/120713]: datetime.datetime.strftime() now 0-pads years with less than four digits for the format specifiers %Y and %G on Linux. Patch by Ben Hsing

• gh-117983 [https://github.com/python/cpython/issues/117983]: Defer the threading import in importlib.util until lazy loading is used.

• gh-119189 [https://github.com/python/cpython/issues/119189]: When using the ** operator or pow() with Fraction as the base and an exponent that is not rational, a float, or a complex, the fraction is no longer converted to a float.

• gh-118714 [https://github.com/python/cpython/issues/118714]: Allow restart in post-mortem debugging of pdb. Removed restart message when the user quits pdb from post-mortem mode.

• gh-105623 [https://github.com/python/cpython/issues/105623]: Fix performance degradation in logging.handlers.RotatingFileHandler. Patch by Craig Robson.

IDLE

• gh-78889 [https://github.com/python/cpython/issues/78889]: Stop Shell freezes by blocking user access to non-method sys.stdout.shell attributes, which are all private.

文档

• gh-121749 [https://github.com/python/cpython/issues/121749]: Fix documentation for PyModule_AddObjectRef().

• gh-120012 [https://github.com/python/cpython/issues/120012]: Clarify the behaviours of multiprocessing.Queue.empty() and multiprocessing.SimpleQueue.empty() on closed queues. Patch by Bénédikt Tran.

核心与内置函数

• gh-121860 [https://github.com/python/cpython/issues/121860]: Fix crash when rematerializing a managed dictionary after it was deleted.

• gh-121814 [https://github.com/python/cpython/issues/121814]: Fixed the SegFault when PyEval_SetTrace() is used with no Python frame on stack.

• gh-121295 [https://github.com/python/cpython/issues/121295]: Fix PyREPL console getting into a blocked state after interrupting a long paste

• gh-121794 [https://github.com/python/cpython/issues/121794]: Fix bug in free-threaded Python where a resurrected object could lead to a negative ref count assertion failure.

• gh-121657 [https://github.com/python/cpython/issues/121657]: Improve the SyntaxError message if the user tries to use yield from outside a function.

• gh-121609 [https://github.com/python/cpython/issues/121609]: Fix pasting of characters containing unicode character joiners in the new REPL. Patch by Marta Gomez Macias

• gh-117482 [https://github.com/python/cpython/issues/117482]: Unexpected slot wrappers are no longer created for builtin static types in subinterpreters.

• gh-121499 [https://github.com/python/cpython/issues/121499]: Fix a bug affecting how multiline history was being rendered in the new REPL after interacting with the new screen cache. Patch by Pablo Galindo

• gh-121497 [https://github.com/python/cpython/issues/121497]: Fix a bug that was preventing the REPL to correctly respect the history when an input hook was set. Patch by Pablo Galindo

• gh-121012 [https://github.com/python/cpython/issues/121012]: Tier 2 execution now ensures that list iterators remain exhausted, once they become exhausted.

• gh-121439 [https://github.com/python/cpython/issues/121439]: Allow tuples of length 20 in the freelist to be reused.

• gh-121368 [https://github.com/python/cpython/issues/121368]: Fix race condition in PyTypeLookup in the free-threaded build due to a missing memory fence. This could lead to PyTypeLookup returning incorrect results on arm64.

• gh-121130 [https://github.com/python/cpython/issues/121130]: Fix fstrings with debug expressions in format specifiers. Patch by Pablo Galindo

• gh-121115 [https://github.com/python/cpython/issues/121115]: PyLong_AsNativeBytes() no longer uses __index__() methods by default. The Py_ASNATIVEBYTES_ALLOW_INDEX flag has been added to allow it.

C API

• gh-89364 [https://github.com/python/cpython/issues/89364]: Export the PySignal_SetWakeupFd() function. Previously, the function was documented but it couldn't be used in 3rd party code. Patch by Victor Stinner.

• gh-113993 [https://github.com/python/cpython/issues/113993]: PyUnicode_InternInPlace() no longer prevents its argument from being garbage collected.

Several functions that take char * are now documented as possibly preventing string objects from being garbage collected; refer to their documentation for details: PyUnicode_InternFromString(), PyDict_SetItemString(), PyObject_SetAttrString(), PyObject_DelAttrString(), PyUnicode_InternFromString(), and PyModule_Add* convenience functions.

• gh-113601 [https://github.com/python/cpython/issues/113601]: Removed debug build assertions related to interning strings, which were falsely triggered by stable ABI extensions.

• gh-112136 [https://github.com/python/cpython/issues/112136]: Restore the private PyArgParser structure and the private PyArgParseTupleAndKeywordsFast() function, previously removed in Python 3.13 alpha 1. Patch by Victor Stinner.

构建

• gh-120371 [https://github.com/python/cpython/issues/120371]: Support WASI SDK 22 by explicitly skipping functions that are just stubs in wasi-libc.

• gh-121731 [https://github.com/python/cpython/issues/121731]: Fix mimalloc compile error on GNU/Hurd

• gh-121487 [https://github.com/python/cpython/issues/121487]: Fix deprecation warning for ATOMIC_VAR_INIT in mimalloc.

• gh-121467 [https://github.com/python/cpython/issues/121467]: Fix a Makefile bug that prevented mimalloc header files from being installed.

• gh-121103 [https://github.com/python/cpython/issues/121103]: On POSIX systems, excluding macOS framework installs, the lib directory for the free-threaded build now includes a "t" suffix to avoid conflicts with a co-located default build installation.

• gh-120831 [https://github.com/python/cpython/issues/120831]: The default minimum iOS version was increased to 13.0.

• gh-113565 [https://github.com/python/cpython/issues/113565]: Improve curses and curses.panel dependency checks in configure.

Python 3.13.0 beta 3

Release date: 2024-06-27

核心与内置函数

• gh-120838 [https://github.com/python/cpython/issues/120838]: Py_Finalize() and Py_FinalizeEx() now always run with the main interpreter active.

• gh-113433 [https://github.com/python/cpython/issues/113433]: Subinterpreters now get cleaned up automatically during runtime finalization.

• gh-119462 [https://github.com/python/cpython/issues/119462]: Make sure that invariants of type versioning are maintained: Superclasses always have their version number assigned before subclasses The version tag is always zero if the tag is not valid. * The version tag is always non-zero if the tag is valid.

• gh-120437 [https://github.com/python/cpython/issues/120437]: Fix CHECKSTACK_SPACE optimization problems introduced in gh-118322 [https://github.com/python/cpython/issues/118322].

• gh-120722 [https://github.com/python/cpython/issues/120722]: Correctly set the bytecode position on return instructions within lambdas. Patch by Jelle Zijlstra.

• gh-120367 [https://github.com/python/cpython/issues/120367]: Fix bug where compiler creates a redundant jump during pseudo-op replacement. Can only happen with a synthetic AST that has a try on the same line as the instruction following the exception handler.

• gh-113993 [https://github.com/python/cpython/issues/113993]: Strings interned with sys.intern() are again garbage-collected when no longer used, as per the documentation. Strings interned with the C function PyUnicode_InternInPlace() are still immortal. Internals of the string interning mechanism have been changed. This may affect performance and identities of str objects.

• gh-120384 [https://github.com/python/cpython/issues/120384]: Fix an array out of bounds crash in list_ass_subscript, which could be invoked via some specificly tailored input: including concurrent modification of a list object, where one thread assigns a slice and another clears it.

• gh-120367 [https://github.com/python/cpython/issues/120367]: Fix crash in compiler on code with redundant NOPs and JUMPs which show up after exception handlers are moved to the end of the code.

• gh-120380 [https://github.com/python/cpython/issues/120380]: Fix Python implementation of pickle.Pickler for bytes and bytearray objects when using protocol version 5. Patch by Bénédikt Tran.

• gh-120400 [https://github.com/python/cpython/issues/120400]: Support Linux perf profiler to see Python calls on RISC-V architecture.

• gh-120221 [https://github.com/python/cpython/issues/120221]: Deliver real signals on Ctrl-C and Ctrl-Z in the new REPL. Patch by Pablo Galindo

• gh-120346 [https://github.com/python/cpython/issues/120346]: Respect PYTHON_BASIC_REPL when running in interative inspect mode (python -i). Patch by Pablo Galindo

• gh-93691 [https://github.com/python/cpython/issues/93691]: Fix source locations of instructions generated for the iterator of a for statement.

• gh-120198 [https://github.com/python/cpython/issues/120198]: Fix a crash when multiple threads read and write to the same __class__ of an object concurrently.

• gh-120298 [https://github.com/python/cpython/issues/120298]: Fix use-after free in list_richcompare_impl which can be invoked via some specificly tailored evil input.

• gh-119666 [https://github.com/python/cpython/issues/119666]: Fix a compiler crash in the case where two comprehensions in class scope both reference __class__.

• gh-120225 [https://github.com/python/cpython/issues/120225]: Fix crash in compiler on empty block at end of exception handler.

• gh-119933 [https://github.com/python/cpython/issues/119933]: Improve SyntaxError messages for invalid expressions in a type parameters bound, a type parameter constraint tuple or a default type parameter. Patch by Bénédikt Tran.

• bpo-24766 [https://bugs.python.org/issue?@action=redirect&bpo=24766]: Fix handling of doc argument to subclasses of property.

库

• gh-121027 [https://github.com/python/cpython/issues/121027]: Add a future warning in functools.partial._get_(). In future Python versions functools.partial will be a method descriptor.

• gh-121025 [https://github.com/python/cpython/issues/121025]: Improve the _repr_() of functools.partialmethod. Patch by Bénédikt Tran.

• gh-121018 [https://github.com/python/cpython/issues/121018]: Fixed an issue where argparse.ArgumentParser.parses_args() did not honor exit_on_error=False when given unrecognized arguments. Patch by Ben Hsing.

• gh-119614 [https://github.com/python/cpython/issues/119614]: Fix truncation of strings with embedded null characters in some internal operations in tkinter.

• gh-120910 [https://github.com/python/cpython/issues/120910]: When reading installed files from an egg, use relative_to(walk_up=True) to honor files installed outside of the installation root.

• gh-120888 [https://github.com/python/cpython/issues/120888]: Upgrade pip wheel bundled with ensurepip (pip 24.1.1)

• gh-101830 [https://github.com/python/cpython/issues/101830]: Accessing the tkinter object's string representation no longer converts the underlying Tcl object to a string on Windows.

• gh-120811 [https://github.com/python/cpython/issues/120811]: Fix possible memory leak in contextvars.Context.run().

• gh-120769 [https://github.com/python/cpython/issues/120769]: Make empty line in pdb repeats the last command even when the command is from cmdqueue.

• gh-120732 [https://github.com/python/cpython/issues/120732]: Fix name passing to unittest.mock.Mock object when using unittest.mock.create_autospec().

• gh-120683 [https://github.com/python/cpython/issues/120683]: Fix an error in logging.LogRecord, when the integer part of the timestamp is rounded up, while the millisecond calculation truncates, causing the log timestamp to be wrong by up to 999 ms (affected roughly 1 in 8 million timestamps).

• gh-120633 [https://github.com/python/cpython/issues/120633]: Move scrollbar and remove tearoff menus in turtledemo.

• gh-120541 [https://github.com/python/cpython/issues/120541]: Improve the prompt in the "less" pager when help() is called with non-string argument.

• gh-120495 [https://github.com/python/cpython/issues/120495]: Fix incorrect exception handling in Tab Nanny. Patch by Wulian233.

• gh-120381 [https://github.com/python/cpython/issues/120381]: Correct inspect.ismethoddescriptor() to check also for the lack of __delete__(). Patch by Jan Kaliszewski.

• gh-90425 [https://github.com/python/cpython/issues/90425]: The OS byte in gzip headers is now always set to 255 when using gzip.compress().

• gh-120343 [https://github.com/python/cpython/issues/120343]: Fix column offset reporting for tokens that come after multiline fstrings in the tokenize module.

• gh-119600 [https://github.com/python/cpython/issues/119600]: Fix unittest.mock.patch() to not read attributes of the target when new_callable is set. Patch by Robert Collins.

• gh-114053 [https://github.com/python/cpython/issues/114053]: Fix edge-case bug where typing.get_type_hints() would produce incorrect results if type parameters in a class scope were overridden by assignments in a class scope and from __future__ import annotations semantics were enabled. Patch by Alex Waygood.

• gh-114053 [https://github.com/python/cpython/issues/114053]: Fix erroneous NameError when calling inspect.get_annotations() with eval_str=True` on a class that made use of PEP 695 [https://peps.python.org/pep-0695/] type parameters in a module that had from __future__ import annotations at the top of the file. Patch by Alex Waygood.

• gh-120268 [https://github.com/python/cpython/issues/120268]: Prohibit passing None to pure-Python datetime.date.fromtimestamp() to achieve consistency with C-extension implementation.

• gh-120244 [https://github.com/python/cpython/issues/120244]: Fix memory leak in re.sub() when the replacement string contains backreferences.

• gh-120211 [https://github.com/python/cpython/issues/120211]: Fix tkinter.ttk with Tcl/Tk 9.0.

• gh-71587 [https://github.com/python/cpython/issues/71587]: Fix crash in C version of datetime.datetime.strptime() when called again on the restarted interpreter.

• gh-120161 [https://github.com/python/cpython/issues/120161]: datetime no longer crashes in certain complex reference cycle situations.

• gh-119698 [https://github.com/python/cpython/issues/119698]: Fix symtable.Class.get_methods() and document its behaviour. Patch by Bénédikt Tran.

• gh-120121 [https://github.com/python/cpython/issues/120121]: Add concurrent.futures.InvalidStateError to module's __all__.

• gh-119933 [https://github.com/python/cpython/issues/119933]: Add the symtable.SymbolTableType enumeration to represent the possible outputs of the symtable.SymbolTable.get_type method. Patch by Bénédikt Tran.

• gh-120108 [https://github.com/python/cpython/issues/120108]: Fix calling copy.deepcopy() on ast trees that have been modified to have references to parent nodes. Patch by Jelle Zijlstra.

• gh-112672 [https://github.com/python/cpython/issues/112672]: Support building tkinter with Tcl 9.0.

• gh-65454 [https://github.com/python/cpython/issues/65454]: unittest.mock.Mock.attach_mock() no longer triggers a call to a PropertyMock being attached.

• gh-81936 [https://github.com/python/cpython/issues/81936]: help() and showtopic() methods now respect a configured output argument to pydoc.Helper and not use the pager in such cases. Patch by Enrico Tröger.

• gh-119577 [https://github.com/python/cpython/issues/119577]: The DeprecationWarning emitted when testing the truth value of an xml.etree.ElementTree.Element now describes unconditionally returning True in a future version rather than raising an exception in Python 3.14.

• gh-118908 [https://github.com/python/cpython/issues/118908]: Limit exposed globals from internal imports and definitions on new REPL startup. Patch by Eugene Triguba and Pablo Galindo.

• gh-119506 [https://github.com/python/cpython/issues/119506]: Fix io.TextIOWrapper.write() method breaks internal buffer when the method is called again during flushing internal buffer.

构建

• gh-120671 [https://github.com/python/cpython/issues/120671]: Fix failing configure tests due to a missing space when appending to CFLAGS.

• gh-120602 [https://github.com/python/cpython/issues/120602]: Correctly handle LLVM installs with LLVM_VERSION_SUFFIX when building with --enable-experimental-jit.

• gh-120326 [https://github.com/python/cpython/issues/120326]: On Windows, fix build error when --disable-gil and --experimental-jit options are combined.

• gh-120291 [https://github.com/python/cpython/issues/120291]: Make the python-config shell script compatible with non-bash shells.

C API

• gh-120642 [https://github.com/python/cpython/issues/120642]: Remove the private PyCODEUNIT type from the public C API. The internal pycore_code.h header should now be used to get this internal type. Patch by Victor Stinner.

• gh-120858 [https://github.com/python/cpython/issues/120858]: PyDict_Next() no longer locks the dictionary in the free-threaded build. The locking needs to be done by the caller around the entire iteration loop.

• gh-120642 [https://github.com/python/cpython/issues/120642]: Remove the following unstable functions:

  • PyUnstable_Replace_Executor()

  • PyUnstable_SetOptimizer()

  • PyUnstable_GetOptimizer()

  • PyUnstable_GetExecutor()

  • PyUnstable_Optimizer_NewCounter()

  • PyUnstable_Optimizer_NewUOpOptimizer()

Patch by Victor Stinner.

• gh-119344 [https://github.com/python/cpython/issues/119344]: The critical section API is now public as part of the non-limited C API.

• gh-118789 [https://github.com/python/cpython/issues/118789]: Add PyUnstable_Object_ClearWeakRefsNoCallbacks(), which clears weakrefs without calling their callbacks.

• gh-117511 [https://github.com/python/cpython/issues/117511]: Make the PyMutex public in the non-limited C API.

Python 3.13.0 beta 2

Release date: 2024-06-05

安全性

• gh-118773 [https://github.com/python/cpython/issues/118773]: Fixes creation of ACLs in os.mkdir() on Windows to work correctly on non-English machines.

• gh-118486 [https://github.com/python/cpython/issues/118486]: os.mkdir() on Windows now accepts mode of 0o700 to restrict the new directory to the current user. This fixes CVE 2024-4030 [https://www.cve.org/CVERecord?id=CVE-2024-4030] affecting tempfile.mkdtemp() in scenarios where the base temporary directory is more permissive than the default.

核心与内置函数

• gh-119724 [https://github.com/python/cpython/issues/119724]: Reverted improvements to error messages for elif/else statements not matching any valid statements, which made in hard to locate the syntax errors inside those elif/else blocks.

• gh-119842 [https://github.com/python/cpython/issues/119842]: Honor PyOS_InputHook() in the new REPL. Patch by Pablo Galindo

• gh-119821 [https://github.com/python/cpython/issues/119821]: Fix execution of annotation scopes within classes when globals is set to a non-dict. Patch by Jelle Zijlstra.

• gh-119548 [https://github.com/python/cpython/issues/119548]: Add a clear command to the REPL. Patch by Pablo Galindo

• gh-111999 [https://github.com/python/cpython/issues/111999]: Fix the signature of str.format_map().

• gh-119560 [https://github.com/python/cpython/issues/119560]: An invalid assert in beta 1 has been removed. The assert would fail if PyState_FindModule() was used in an extension module's init function before the module def had been initialized.

• gh-119369 [https://github.com/python/cpython/issues/119369]: Fix deadlock during thread deletion in free-threaded build, which could occur when the GIL was enabled at runtime.

• gh-119525 [https://github.com/python/cpython/issues/119525]: Fix deadlock involving PyTypeLookup() cache in the free-threaded build when the GIL is dynamically enabled at runtime.

• gh-119311 [https://github.com/python/cpython/issues/119311]: Fix bug where names are unexpectedly mangled in the bases of generic classes.

• gh-119395 [https://github.com/python/cpython/issues/119395]: Fix bug where names appearing after a generic class are mangled as if they are in the generic class.

• gh-119213 [https://github.com/python/cpython/issues/119213]: Non-builtin modules built with argument clinic were crashing if used in a subinterpreter before the main interpreter. The objects that were causing the problem by leaking between interpreters carelessly have been fixed.

• gh-119011 [https://github.com/python/cpython/issues/119011]: Fixes type.__type_params__ to return an empty tuple instead of a descriptor.

• gh-118692 [https://github.com/python/cpython/issues/118692]: Avoid creating unnecessary StopIteration instances for monitoring.

• gh-119049 [https://github.com/python/cpython/issues/119049]: Fix displaying the source line for warnings created by the C API if the warnings module had not yet been imported.

• gh-118844 [https://github.com/python/cpython/issues/118844]: Fix build failures when configuring with both --disable-gil and --enable-experimental-jit.

• gh-118921 [https://github.com/python/cpython/issues/118921]: Add copy() method for FrameLocalsProxy which returns a snapshot dict for local variables.

• gh-117657 [https://github.com/python/cpython/issues/117657]: Fix data races on the field that stores a pointer to the interpreter's main thread that occur in free-threaded builds.

• gh-118561 [https://github.com/python/cpython/issues/118561]: Fix race condition in free-threaded build where list.extend() could expose uninitialised memory to concurrent readers.

• gh-117195 [https://github.com/python/cpython/issues/117195]: Avoid assertion failure for debug builds when calling object.__sizeof__(1)

库

• gh-119819 [https://github.com/python/cpython/issues/119819]: Fix regression to allow logging configuration with multiprocessing queue types.

• gh-117142 [https://github.com/python/cpython/issues/117142]: The ctypes module may now be imported in all subinterpreters, including those that have their own GIL.

• gh-118835 [https://github.com/python/cpython/issues/118835]: Fix _pyrepl crash when using custom prompt with ANSI escape codes.

• gh-117398 [https://github.com/python/cpython/issues/117398]: The _datetime module (C implementation for datetime) now supports being imported in multiple interpreters.

• gh-89727 [https://github.com/python/cpython/issues/89727]: Fix issue with shutil.rmtree() where a RecursionError is raised on deep directory trees.

• gh-89727 [https://github.com/python/cpython/issues/89727]: Partially fix issue with shutil.rmtree() where a RecursionError is raised on deep directory trees. A recursion error is no longer raised when rmtree.avoids_symlink_attacks is false.

• gh-119118 [https://github.com/python/cpython/issues/119118]: Fix performance regression in the tokenize module by caching the line token attribute and calculating the column offset more efficiently.

• gh-89727 [https://github.com/python/cpython/issues/89727]: Fix issue with os.fwalk() where a RecursionError was raised on deep directory trees by adjusting the implementation to be iterative instead of recursive.

• gh-119588 [https://github.com/python/cpython/issues/119588]: zipfile.Path.is_symlink now assesses if the given path is a symlink.

• gh-119555 [https://github.com/python/cpython/issues/119555]: Catch SyntaxError from compile() in the runsource() method of the InteractiveColoredConsole. Patch by Sergey B Kirpichev.

• gh-113892 [https://github.com/python/cpython/issues/113892]: Now, the method sock_connect of asyncio.ProactorEventLoop raises a ValueError if given socket is not in nonblocking mode, as well as in other loop implementations.

• gh-119443 [https://github.com/python/cpython/issues/119443]: The interactive REPL no longer runs with from __future__ import annotations enabled. Patch by Jelle Zijlstra.

• gh-117398 [https://github.com/python/cpython/issues/117398]: Objects in the datetime C-API are now all statically allocated, which means better memory safety, especially when the module is reloaded. This should be transparent to users.

• gh-118894 [https://github.com/python/cpython/issues/118894]: asyncio REPL now has the same capabilities as PyREPL.

• gh-118911 [https://github.com/python/cpython/issues/118911]: In PyREPL, updated maybe-accept's logic so that if the user hits Enter twice, they are able to terminate the block even if there's trailing whitespace. Also, now when the user hits arrow up, the cursor is on the last functional line. This matches IPython's behavior. Patch by Aya Elsayed.

• gh-111201 [https://github.com/python/cpython/issues/111201]: Remove dependency to readline from the new Python REPL.

• gh-119174 [https://github.com/python/cpython/issues/119174]: Fix high DPI causes turtledemo(turtle-graphics examples) windows blurry Patch by Wulian233 and Terry Jan Reedy

• gh-119121 [https://github.com/python/cpython/issues/119121]: Fix a NameError happening in asyncio.staggered.staggered_race. This function is now tested.

• gh-119113 [https://github.com/python/cpython/issues/119113]: Fix issue where pathlib.PurePath.with_suffix() didn't raise TypeError when given None as a suffix.

• gh-118643 [https://github.com/python/cpython/issues/118643]: Fix an AttributeError in the email module when re-fold a long address list. Also fix more cases of incorrect encoding of the address separator in the address list.

• gh-58933 [https://github.com/python/cpython/issues/58933]: Make pdb return to caller frame correctly when f_trace of the caller frame is not set

• gh-118895 [https://github.com/python/cpython/issues/118895]: Setting attributes on typing.NoDefault now raises AttributeError instead of TypeError.

• gh-118868 [https://github.com/python/cpython/issues/118868]: Fixed issue where kwargs were no longer passed to the logging handler QueueHandler

• gh-118851 [https://github.com/python/cpython/issues/118851]: ctx arguments to the constructors of ast node classes now default to ast.Load(). Patch by Jelle Zijlstra.

• gh-118760 [https://github.com/python/cpython/issues/118760]: Restore the default value of tkiter.wantobjects to 1.

• gh-118760 [https://github.com/python/cpython/issues/118760]: Fix errors in calling Tkinter bindings on Windows.

• gh-118507 [https://github.com/python/cpython/issues/118507]: Fix os.path.isfile() on Windows for pipes. Speedup os.path.isjunction() and os.path.lexists() on Windows with a native implementation.

• gh-118772 [https://github.com/python/cpython/issues/118772]: Allow typing.TypeVar instances without a default to follow instances without a default in some cases. Patch by Jelle Zijlstra.

• gh-110863 [https://github.com/python/cpython/issues/110863]: os.path.realpath() now suppresses any OSError from os.readlink() when strict mode is disabled (the default).

• gh-118263 [https://github.com/python/cpython/issues/118263]: Speed up os.path.splitroot() & os.path.normpath() with a direct C call.

• gh-118033 [https://github.com/python/cpython/issues/118033]: Fix dataclasses.dataclass() not creating a __weakref__ slot when subclassing typing.Generic.

• gh-106531 [https://github.com/python/cpython/issues/106531]: In importlib.resources, sync with importlib_resources 6.3.2 [https://importlib-resources.readthedocs.io/en/latest/history.html#v6-3-2], including: MultiplexedPath now expects Traversable paths, deprecating string arguments to MultiplexedPath; Enabled support for resources in namespace packages in zip files; Fixed NotADirectoryError when calling files on a subdirectory of a namespace package.

• gh-113978 [https://github.com/python/cpython/issues/113978]: Ignore warnings on text completion inside REPL.

• gh-103956 [https://github.com/python/cpython/issues/103956]: Fix lack of newline characters in trace module output when line tracing is enabled but source code line for current frame is not available.

• gh-92081 [https://github.com/python/cpython/issues/92081]: Fix missing spaces in email headers when the spaces are mixed with encoded 8-bit characters.

• gh-103194 [https://github.com/python/cpython/issues/103194]: Prepare Tkinter for C API changes in Tcl 8.7/9.0 to avoid tkinter.TclObj being unexpectedly returned instead of bool, str, bytearray, or int.

• gh-87106 [https://github.com/python/cpython/issues/87106]: Fixed handling in inspect.Signature.bind() of keyword arguments having the same name as positional-only arguments when a variadic keyword argument (e.g. **kwargs) is present.

• bpo-45767 [https://bugs.python.org/issue?@action=redirect&bpo=45767]: Fix integer conversion in os.major(), os.minor(), and os.makedev(). Support device numbers larger than 2**63-1. Support nonexistent device number (NODEV).

• gh-67693 [https://github.com/python/cpython/issues/67693]: Fix urllib.parse.urlunparse() and urllib.parse.urlunsplit() for URIs with path starting with multiple slashes and no authority. Based on patch by Ashwin Ramaswami.

测试

• gh-119050 [https://github.com/python/cpython/issues/119050]: regrtest test runner: Add XML support to the refleak checker (-R option). Patch by Victor Stinner.

构建

• gh-119729 [https://github.com/python/cpython/issues/119729]: On POSIX systems, the pkg-config (.pc) filenames now include the ABI flags, which may include debug ("d") and free-threaded ("t"). For example: python3.14.pc (default, non-debug build) python3.14d.pc (default, debug build) * python3.14t.pc (free-threaded build)

• gh-115119 [https://github.com/python/cpython/issues/115119]: Fall back to the bundled libmpdec if a system version cannot be found.

• gh-119132 [https://github.com/python/cpython/issues/119132]: Update sys.version to identify whether the build is default build or free-threading build. Patch By Donghee Na.

• gh-118836 [https://github.com/python/cpython/issues/118836]: Fix an AssertionError when building with --enable-experimental-jit and the compiler emits a SHT_NOTE section.

• gh-118943 [https://github.com/python/cpython/issues/118943]: Fix a possible race condition affecting parallel builds configured with --enable-experimental-jit, in which compilation errors could be caused by an incompletely-generated header file.

Windows

• gh-119679 [https://github.com/python/cpython/issues/119679]: Ensures correct import libraries are included in Windows installs.

• gh-119690 [https://github.com/python/cpython/issues/119690]: Adds Unicode support and fixes audit events for _winapi.CreateNamedPipe.

• gh-111201 [https://github.com/python/cpython/issues/111201]: Add support for new pyrepl on Windows

• gh-119070 [https://github.com/python/cpython/issues/119070]: Fixes py.exe handling of shebangs like usrbin/env python3.12, which were previously interpreted as python3.exe instead of python3.12.exe.

• gh-117505 [https://github.com/python/cpython/issues/117505]: Fixes an issue with the Windows installer not running ensurepip in a fully isolated environment. This could cause unexpected interactions with the user site-packages.

• gh-118209 [https://github.com/python/cpython/issues/118209]: Avoid crashing in mmap on Windows when the mapped memory is inaccessible due to file system errors or access violations.

• gh-116145 [https://github.com/python/cpython/issues/116145]: Updated bundled Tcl/Tk to 8.6.14.

C API

• gh-119585 [https://github.com/python/cpython/issues/119585]: Fix crash when a thread state that was created by PyGILState_Ensure() calls a destructor that during PyThreadState_Clear() that calls back into PyGILState_Ensure() and PyGILState_Release(). This might occur when in the free-threaded build or when using thread-local variables whose destructors call PyGILState_Ensure().

• gh-119336 [https://github.com/python/cpython/issues/119336]: Restore the removed PyLongNumBits() function. It is used by the pywin32 project. Patch by Ethan Smith

• gh-119247 [https://github.com/python/cpython/issues/119247]: Added Py_BEGIN_CRITICAL_SECTION_SEQUENCE_FAST and Py_END_CRITICAL_SECTION_SEQUENCE_FAST macros to make it possible to use PySequence_Fast APIs safely when free-threaded, and update str.join to work without the GIL using them.

• gh-111389 [https://github.com/python/cpython/issues/111389]: Add PyHASH_MULTIPLIER constant: prime multiplier used in string and various other hashes. Patch by Victor Stinner.

• gh-116984 [https://github.com/python/cpython/issues/116984]: Make mimalloc includes relative to the current file to avoid embedders or extensions needing to include Internal/mimalloc if they are already including internal CPython headers.

• gh-118789 [https://github.com/python/cpython/issues/118789]: Restore PyWeakrefClearRef that was previously removed in Python 3.13 alpha 1.

Python 3.13.0 beta 1

Release date: 2024-05-08

安全性

• gh-116741 [https://github.com/python/cpython/issues/116741]: Update bundled libexpat to 2.6.2

• gh-117233 [https://github.com/python/cpython/issues/117233]: Detect BLAKE2, SHA3, Shake, & truncated SHA512 support in the OpenSSL-ish libcrypto library at build time. This allows hashlib to be used with libraries that do not to support every algorithm that upstream OpenSSL does.

核心与内置函数

• gh-118414 [https://github.com/python/cpython/issues/118414]: Add instrumented opcodes to YIELD_VALUE assertion for tracing cases.

• gh-117953 [https://github.com/python/cpython/issues/117953]: When a builtin or extension module is imported for the first time, while a subinterpreter is active, the module's init function is now run by the main interpreter first before import continues in the subinterpreter. Consequently, single-phase init modules now fail in an isolated subinterpreter without the init function running under that interpreter, whereas before it would run under the subinterpreter before failing, potentially leaving behind global state and callbacks and otherwise leaving the module in an inconsistent state.

• gh-117549 [https://github.com/python/cpython/issues/117549]: Don't use designated initializer syntax in inline functions in internal headers. They cause problems for C++ or MSVC users who aren't yet using the latest C++ standard (C++20). While internal, pycore_backoff.h, is included (indirectly, via pycore_code.h) by some key 3rd party software that does so for speed.

• gh-95382 [https://github.com/python/cpython/issues/95382]: Improve performance of json.dumps() and json.dump() when using the argument indent. Depending on the data the encoding using json.dumps() with indent can be up to 2 to 3 times faster.

• gh-116322 [https://github.com/python/cpython/issues/116322]: In --disable-gil builds, the GIL will be enabled while loading C extension modules. If the module indicates that it supports running without the GIL, the GIL will be disabled once loading is complete. Otherwise, the GIL will remain enabled for the remainder of the interpreter's lifetime. This behavior does not apply if the GIL has been explicitly enabled or disabled with PYTHON_GIL or -Xgil.

• gh-118513 [https://github.com/python/cpython/issues/118513]: Fix incorrect UnboundLocalError when two comprehensions in the same function both reference the same name, and in one comprehension the name is bound while in the other it's an implicit global.

• gh-118518 [https://github.com/python/cpython/issues/118518]: Allow the Linux perf support to work without frame pointers using perf's advanced JIT support. The feature is activated when using the PYTHON_PERF_JIT_SUPPORT environment variable or when running Python with -Xperf_jit. Patch by Pablo Galindo.

• gh-117514 [https://github.com/python/cpython/issues/117514]: Add sys._is_gil_enabled() function that returns whether the GIL is currently enabled. In the default build it always returns True because the GIL is always enabled. In the free-threaded build, it may return True or False.

• gh-118164 [https://github.com/python/cpython/issues/118164]: Break a loop between the Python implementation of the decimal module and the Python code for integer to string conversion. Also optimize integer to string conversion for values in the range from 9_000 to 135_000 decimal digits.

• gh-118473 [https://github.com/python/cpython/issues/118473]: Fix sys.set_asyncgen_hooks() not to be partially set when raising TypeError.

• gh-118465 [https://github.com/python/cpython/issues/118465]: Compiler populates the new __firstlineno__ field on a class with the line number of the first line of the class definition.

• gh-118492 [https://github.com/python/cpython/issues/118492]: Fix an issue where the type cache can expose a previously accessed attribute when a finalizer is run.

• gh-117714 [https://github.com/python/cpython/issues/117714]: update async_generator.athrow().close() and async_generator.asend().close() to close their section of the underlying async generator

• gh-111201 [https://github.com/python/cpython/issues/111201]: The interactive interpreter is now implemented in Python, which allows for a number of new features like colors, multiline input, history viewing, and paste mode. Contributed by Pablo Galindo, Łukasz Langa and Lysandros Nikolaou based on code from the PyPy project.

• gh-74929 [https://github.com/python/cpython/issues/74929]: Implement PEP 667: converted FrameType.f_locals and PyFrame_GetLocals() to return a write-through proxy object when the frame refers to a function or comprehension.

• gh-116767 [https://github.com/python/cpython/issues/116767]: Fix crash in compiler on 'async with' that has many context managers.

• gh-118335 [https://github.com/python/cpython/issues/118335]: Change how to use the tier 2 interpreter. Instead of running Python with -X uops or setting the environment variable PYTHON_UOPS=1, this choice is now made at build time by configuring with --enable-experimental-jit=interpreter.

Beware! This changes the environment variable to enable or disable microops to PYTHON_JIT. The old PYTHON_UOPS is no longer used.

• gh-118306 [https://github.com/python/cpython/issues/118306]: Update JIT compilation to use LLVM 18

• gh-118160 [https://github.com/python/cpython/issues/118160]: Annotation scopes within classes can now contain comprehensions. However, such comprehensions are not inlined into their parent scope at runtime. Patch by Jelle Zijlstra.

• gh-118272 [https://github.com/python/cpython/issues/118272]: Fix bug where generator.close does not free the generator frame's locals.

• gh-118216 [https://github.com/python/cpython/issues/118216]: Don't consider __future__ imports with dots before the module name.

• gh-118074 [https://github.com/python/cpython/issues/118074]: Make sure that the Executor objects in the COLD_EXITS array aren't assumed to be GC-able (which would access bytes outside the object).

• gh-107674 [https://github.com/python/cpython/issues/107674]: Lazy load frame line number to improve performance of tracing

• gh-118082 [https://github.com/python/cpython/issues/118082]: Improve SyntaxError message for imports without names, like in from x import and import cases. It now points out to users that import expects at least one name after it.

• gh-118090 [https://github.com/python/cpython/issues/118090]: Improve SyntaxError message for empty type param brackets.

• gh-117958 [https://github.com/python/cpython/issues/117958]: Added a get_jit_code() method to access JIT compiled machine code from the UOp Executor when the experimental JIT is enabled. Patch by Anthony Shaw.

• gh-117901 [https://github.com/python/cpython/issues/117901]: Add option for compiler's codegen to save nested instruction sequences for introspection.

• gh-116622 [https://github.com/python/cpython/issues/116622]: Redirect stdout and stderr to system log when embedded in an Android app.

• gh-109118 [https://github.com/python/cpython/issues/109118]: annotation scope within class scopes can now contain lambdas.

• gh-117894 [https://github.com/python/cpython/issues/117894]: Prevent agen.aclose() objects being re-used after .throw().

• gh-117881 [https://github.com/python/cpython/issues/117881]: prevent concurrent access to an async generator via athrow().throw() or asend().throw()

• gh-117536 [https://github.com/python/cpython/issues/117536]: Fix a RuntimeWarning when calling agen.aclose().throw(Exception).

• gh-117755 [https://github.com/python/cpython/issues/117755]: Fix mimalloc allocator for huge memory allocation (around 8,589,934,592 GiB) on s390x. Patch by Victor Stinner.

• gh-117750 [https://github.com/python/cpython/issues/117750]: Fix issue where an object's dict would get out of sync with the object's internal values when being cleared. obj.__dict__.clear() now clears the internal values, but leaves the dict attached to the object.

• gh-117431 [https://github.com/python/cpython/issues/117431]: Improve the performance of the following bytes and bytearray methods by adapting them to the METH_FASTCALL calling convention:

  • count()

  • find()

  • index()

  • rfind()

  • rindex()

• gh-117709 [https://github.com/python/cpython/issues/117709]: Speed up calls to str() with positional-only argument, by using the PEP 590 [https://peps.python.org/pep-0590/] vectorcall calling convention. Patch by Erlend Aasland.

• gh-117680 [https://github.com/python/cpython/issues/117680]: Give _PyInstructionSequence a Python interface and use it in tests.

• gh-115776 [https://github.com/python/cpython/issues/115776]: Statically allocated objects are, by definition, immortal so must be marked as such regardless of whether they are in extension modules or not.

• gh-117385 [https://github.com/python/cpython/issues/117385]: Remove unhandled PY_MONITORING_EVENT_BRANCH and PY_MONITORING_EVENT_EXCEPTION_HANDLED events from sys.settrace().

• gh-116322 [https://github.com/python/cpython/issues/116322]: Extension modules may indicate to the runtime that they can run without the GIL. Multiphase init modules do so by calling providing Py_MOD_GIL_NOT_USED for the Py_mod_gil slot, while single-phase init modules call PyUnstable_Module_SetGIL(mod, Py_MOD_GIL_NOT_USED) from their init function.

• gh-116129 [https://github.com/python/cpython/issues/116129]: Implement PEP 696 [https://peps.python.org/pep-0696/], adding support for defaults on type parameters. Patch by Jelle Zijlstra.

• gh-93502 [https://github.com/python/cpython/issues/93502]: Add two new functions to the C-API, PyRefTracer_SetTracer() and PyRefTracer_GetTracer(), that allows to track object creation and destruction the same way the tracemalloc module does. Patch by Pablo Galindo

• gh-107674 [https://github.com/python/cpython/issues/107674]: Improved the performance of sys.settrace() significantly

• gh-95754 [https://github.com/python/cpython/issues/95754]: Improve the error message when a script shadowing a module from the standard library causes AttributeError to be raised. Similarly, improve the error message when a script shadowing a third party module attempts to access an attribute from that third party module while still initialising.

• gh-99180 [https://github.com/python/cpython/issues/99180]: Elide uninformative traceback indicators in return and simple assignment statements. Patch by Pablo Galindo.

• gh-105879 [https://github.com/python/cpython/issues/105879]: Allow the globals and locals arguments to exec() and eval() to be passed as keywords.