3.12.0a1 - Cpython — ContextQMD

.. date: 2022-09-28-17-09-37 .. gh-issue: 97616 .. nonce: K1e3Xs .. release date: 2022-10-25 .. section: Security

Fix multiplying a list by an integer (list *= int): detect the integer overflow when the new allocated length is close to the maximum size. Issue reported by Jordan Limor. Patch by Victor Stinner.

.. date: 2022-09-07-10-42-00 .. gh-issue: 97514 .. nonce: Yggdsl .. section: Security

On Linux the :mod:multiprocessing module returns to using filesystem backed unix domain sockets for communication with the forkserver process instead of the Linux abstract socket namespace. Only code that chooses to use the :ref:"forkserver" start method <multiprocessing-start-methods> is affected.

Abstract sockets have no permissions and could allow any user on the system in the same network namespace <https://man7.org/linux/man-pages/man7/network_namespaces.7.html>_ (often the whole system) to inject code into the multiprocessing forkserver process. This was a potential privilege escalation. Filesystem based socket permissions restrict this to the forkserver process user as was the default in Python 3.8 and earlier.

This prevents Linux :cve:2022-42919.

.. date: 2022-06-15-20-09-23 .. gh-issue: 87389 .. nonce: QVaC3f .. section: Security

:mod:http.server: Fix an open redirection vulnerability in the HTTP server when an URI path starts with //. Vulnerability discovered, and initial fix proposed, by Hamza Avvan.

.. date: 2022-06-03-12-52-53 .. gh-issue: 79096 .. nonce: YVoxgC .. section: Security

LWPCookieJar and MozillaCookieJar create files with file mode 600 instead of 644 (Microsoft Windows is not affected)

.. date: 2022-05-19-08-53-07 .. gh-issue: 92888 .. nonce: TLtR9W .. section: Security

Fix memoryview use after free when accessing the backing buffer in certain cases.

.. date: 2022-04-27-18-25-30 .. gh-issue: 68966 .. nonce: gjS8zs .. section: Security

The deprecated mailcap module now refuses to inject unsafe text (filenames, MIME types, parameters) into shell commands. Instead of using such text, it will warn and act as if a match was not found (or for test commands, as if the test failed).

.. date: 2022-10-19-23-48-46 .. gh-issue: 98374 .. nonce: eOBh8M .. section: Core and Builtins

Suppress ImportError for invalid query for help() command. Patch by Donghee Na.

.. date: 2022-10-19-20-53-38 .. gh-issue: 98461 .. nonce: iNmPDV .. section: Core and Builtins

Fix source location in bytecode for list, set and dict comprehensions as well as generator expressions.

.. date: 2022-10-19-18-03-28 .. gh-issue: 98354 .. nonce: GRGta3 .. section: Core and Builtins

Added unicode check for name attribute of spec argument passed in :func:!_imp.create_builtin function.

.. date: 2022-10-18-16-17-44 .. gh-issue: 98398 .. nonce: x4rYK_ .. section: Core and Builtins

Fix source location of 'assert' bytecodes.

.. date: 2022-10-18-14-11-32 .. gh-issue: 98390 .. nonce: H1sxJu .. section: Core and Builtins

Fix location of sub-expressions of boolean expressions, by reducing their scope to that of the sub-expression.

.. date: 2022-10-13-23-23-01 .. gh-issue: 98254 .. nonce: bC8IKt .. section: Core and Builtins

Modules from the standard library are now potentially suggested as part of the error messages displayed by the interpreter when an :exc:NameError is raised to the top level. Patch by Pablo Galindo

.. date: 2022-10-06-23-13-34 .. gh-issue: 97997 .. nonce: JQaJKF .. section: Core and Builtins

Add running column offset to the tokenizer state to avoid calculating AST column information with pointer arithmetic.

.. date: 2022-10-06-20-41-29 .. gh-issue: 97973 .. nonce: gB-xWi .. section: Core and Builtins

Modify the tokenizer to return all necessary information the parser needs to set location information in the AST nodes, so that the parser does not have to calculate those doing pointer arithmetic.

.. date: 2022-10-06-15-45-57 .. gh-issue: 96078 .. nonce: fS-6mU .. section: Library

:func:os.sched_yield now release the GIL while calling sched_yield(2). Patch by Donghee Na.

.. date: 2022-10-06-14-14-28 .. gh-issue: 97955 .. nonce: Nq5VXD .. section: Library

Migrate :mod:zoneinfo to Argument Clinic.

.. date: 2022-10-06-06-36-29 .. gh-issue: 97912 .. nonce: jGRJpa .. section: Core and Builtins

The compiler now avoids quadratic behavior when finding which instructions should use the :opcode:LOAD_FAST_CHECK opcode.

.. date: 2022-10-06-02-11-34 .. gh-issue: 97002 .. nonce: Zvsk71 .. section: Core and Builtins

Fix an issue where several frame objects could be backed by the same interpreter frame, possibly leading to corrupted memory and hard crashes of the interpreter.

.. date: 2022-10-05-17-02-22 .. gh-issue: 97943 .. nonce: LYAWlE .. section: Core and Builtins

Bugfix: :c:func:PyFunction_GetAnnotations should return a borrowed reference. It was returning a new reference.

.. date: 2022-10-05-11-37-15 .. gh-issue: 97922 .. nonce: Zu9Bge .. section: Core and Builtins

The Garbage Collector now runs only on the eval breaker mechanism of the Python bytecode evaluation loop instead on object allocations. The GC can also run when :c:func:PyErr_CheckSignals is called so C extensions that need to run for a long time without executing any Python code also have a chance to execute the GC periodically.

.. date: 2022-10-05-00-37-27 .. gh-issue: 65961 .. nonce: z0Ys0y .. section: Core and Builtins

When __package__ is different than __spec__.parent, raise a DeprecationWarning instead of ImportWarning.

Also remove importlib.util.set_package() which was scheduled for removal.

.. date: 2022-10-04-17-02-18 .. gh-issue: 97850 .. nonce: E3QTRA .. section: Core and Builtins

Long deprecated, module_repr() should now be completely eradicated.

.. date: 2022-10-04-14-04-40 .. gh-issue: 86298 .. nonce: QVM7G1 .. section: Core and Builtins

In cases where warnings.warn_explicit() consults the module's loader, an DeprecationWarning is issued when m.__loader__ differs from m.__spec__.loader.

.. date: 2022-10-04-02-00-10 .. gh-issue: 97779 .. nonce: f3N1hI .. section: Core and Builtins

Ensure that all Python frame objects are backed by "complete" frames.

.. date: 2022-10-03-16-12-39 .. gh-issue: 91052 .. nonce: MsYL9d .. section: Core and Builtins

Add API for subscribing to modification events on selected dictionaries.

.. date: 2022-10-03-13-35-48 .. gh-issue: 97752 .. nonce: 0xTjJY .. section: Core and Builtins

Fix possible data corruption or crashes when accessing the f_back member of newly-created generator or coroutine frames.

.. date: 2022-10-01-08-55-09 .. gh-issue: 97591 .. nonce: pw6kkH .. section: Core and Builtins

Fixed a missing incref/decref pair in Exception.__setstate__(). Patch by Ofey Chan.

.. date: 2022-09-30-13-26-58 .. gh-issue: 97670 .. nonce: n61vMR .. section: Core and Builtins

Remove the :func:sys.getdxp function and the Tools/scripts/analyze_dxp.py script. DXP stands for "dynamic execution pairs". They were related to DYNAMIC_EXECUTION_PROFILE and DXPAIRS macros which have been removed in Python 3.11. Python can now be built with :option:./configure --enable-pystats <--enable-pystats> to gather statistics on Python opcodes. Patch by Victor Stinner.

.. date: 2022-09-29-15-19-29 .. gh-issue: 94526 .. nonce: wq5m6T .. section: Core and Builtins

Fix the Python path configuration used to initialized :data:sys.path at Python startup. Paths are no longer encoded to UTF-8/strict to avoid encoding errors if it contains surrogate characters (bytes paths are decoded with the surrogateescape error handler). Patch by Victor Stinner.

.. date: 2022-09-27-11-59-13 .. gh-issue: 96670 .. nonce: XrBBit .. section: Core and Builtins

The parser now raises :exc:SyntaxError when parsing source code containing null bytes. Patch by Pablo Galindo

.. date: 2022-09-21-16-06-37 .. gh-issue: 96975 .. nonce: BmE0XY .. section: Core and Builtins

Fix a crash occurring when :c:func:PyEval_GetFrame is called while the topmost Python frame is in a partially-initialized state.

.. date: 2022-09-21-14-38-31 .. gh-issue: 96848 .. nonce: WuoLzU .. section: Core and Builtins

Fix command line parsing: reject :option:-X int_max_str_digits <-X> option with no value (invalid) when the :envvar:PYTHONINTMAXSTRDIGITS environment variable is set to a valid limit. Patch by Victor Stinner.

.. date: 2022-09-20-11-06-45 .. gh-issue: 95921 .. nonce: dkcRQn .. section: Core and Builtins

Fix overly-broad source position information for chained comparisons used as branching conditions.

.. date: 2022-09-19-03-35-01 .. gh-issue: 96821 .. nonce: izK6JA .. section: Library

Fix undefined behaviour in audioop.c.

.. date: 2022-09-18-08-47-40 .. gh-issue: 96821 .. nonce: Co2iOq .. section: Core and Builtins

Fix undefined behaviour in _testcapimodule.c.

.. date: 2022-09-16-19-02-40 .. gh-issue: 95778 .. nonce: cJmnst .. section: Core and Builtins

When :exc:ValueError is raised if an integer is larger than the limit, mention the :func:sys.set_int_max_str_digits function in the error message. Patch by Victor Stinner.

.. date: 2022-09-16-16-54-35 .. gh-issue: 96387 .. nonce: GRzewg .. section: Core and Builtins

At Python exit, sometimes a thread holding the GIL can wait forever for a thread (usually a daemon thread) which requested to drop the GIL, whereas the thread already exited. To fix the race condition, the thread which requested the GIL drop now resets its request before exiting. Issue discovered and analyzed by Mingliang ZHAO. Patch by Victor Stinner.

.. date: 2022-09-16-12-36-13 .. gh-issue: 96864 .. nonce: PLU3i8 .. section: Core and Builtins

Fix a possible assertion failure, fatal error, or :exc:SystemError if a line tracing event raises an exception while opcode tracing is enabled.

.. date: 2022-09-13-21-45-07 .. gh-issue: 95778 .. nonce: Oll4_5 .. section: Core and Builtins

The PyLong_FromString function was refactored to make it more maintainable and extensible.

.. date: 2022-09-13-12-06-46 .. gh-issue: 96678 .. nonce: NqGFyb .. section: Core and Builtins

Fix undefined behaviour in C code of null pointer arithmetic.

.. date: 2022-09-12-16-58-22 .. gh-issue: 96754 .. nonce: 0GRme5 .. section: Core and Builtins

Make sure that all frame objects created are created from valid interpreter frames. Prevents the possibility of invalid frames in backtraces and signal handlers.

.. date: 2022-09-12-15-15-04 .. gh-issue: 90997 .. nonce: sZO8c9 .. section: Core and Builtins

Improve the performance of reading and writing inline bytecode caches on some platforms.

.. date: 2022-09-11-12-43-43 .. gh-issue: 96751 .. nonce: anRT6a .. section: Core and Builtins

Remove dead code from CALL_FUNCTION_EX opcode.

.. date: 2022-09-11-00-37-50 .. gh-issue: 90751 .. nonce: VE8-zf .. section: Core and Builtins

:class:memoryview now supports half-floats. Patch by Donghee Na and Antoine Pitrou.

.. date: 2022-09-09-13-13-27 .. gh-issue: 96678 .. nonce: vMxi9F .. section: Core and Builtins

Fix case of undefined behavior in ceval.c

.. date: 2022-09-08-20-58-10 .. gh-issue: 64373 .. nonce: AfCi36 .. section: Library

Convert :mod:!_functools to argument clinic.

.. date: 2022-09-07-13-38-37 .. gh-issue: 96641 .. nonce: wky0Fc .. section: Library

Do not expose KeyWrapper in :mod:!_functools.

.. date: 2022-09-07-12-02-11 .. gh-issue: 96636 .. nonce: YvN-K6 .. section: Core and Builtins

Ensure that tracing, sys.setrace(), is turned on immediately. In pre-release versions of 3.11, some tracing events might have been lost when turning on tracing in a __del__ method or interrupt.

.. date: 2022-09-06-16-54-49 .. gh-issue: 96572 .. nonce: 8DRsaW .. section: Core and Builtins

Fix use after free in trace refs build mode. Patch by Kumar Aditya.

.. date: 2022-09-06-16-22-13 .. gh-issue: 96611 .. nonce: 14wIX8 .. section: Core and Builtins

When loading a file with invalid UTF-8 inside a multi-line string, a correct SyntaxError is emitted.

.. date: 2022-09-06-14-26-36 .. gh-issue: 96612 .. nonce: P4ZbeY .. section: Core and Builtins

Make sure that incomplete frames do not show up in tracemalloc traces.

.. date: 2022-09-06-11-19-03 .. gh-issue: 90230 .. nonce: YOtzs5 .. section: Core and Builtins

Fix compiler warnings and test failures when building with --enable-pystats.

.. date: 2022-09-05-19-20-44 .. gh-issue: 96587 .. nonce: bVxhX2 .. section: Core and Builtins

Correctly raise SyntaxError on exception groups (:pep:654) on python versions prior to 3.11

.. date: 2022-09-05-16-43-44 .. gh-issue: 96569 .. nonce: 9lmTCC .. section: Core and Builtins

Remove two cases of undefined behavior, by adding NULL checks.

.. date: 2022-09-05-15-07-25 .. gh-issue: 96582 .. nonce: HEsL5s .. section: Core and Builtins

Fix possible NULL pointer dereference in _PyThread_CurrentFrames. Patch by Kumar Aditya.

.. date: 2022-09-05-09-56-32 .. gh-issue: 91079 .. nonce: H4-DdU .. section: Core and Builtins

Separate Python recursion checking from C recursion checking which reduces the chance of C stack overflow and allows the recursion limit to be increased safely.

.. date: 2022-09-02-16-47-52 .. gh-issue: 93911 .. nonce: vF-GWe .. section: Core and Builtins

Fix an issue that could prevent :opcode:LOAD_ATTR from specializing properly when accessing properties.

.. date: 2022-08-31-18-46-13 .. gh-issue: 96348 .. nonce: xzCoTP .. section: Core and Builtins

Emit a DeprecationWarning when :meth:~generator.throw, :meth:~coroutine.throw or :meth:~agen.athrow are called with more than one argument.

.. date: 2022-08-29-13-06-58 .. gh-issue: 95196 .. nonce: eGRR4b .. section: Core and Builtins

Disable incorrect pickling of the C implemented classmethod descriptors.

.. date: 2022-08-29-00-37-21 .. gh-issue: 96364 .. nonce: c-IVyb .. section: Core and Builtins

Fix text signatures of list.__getitem__ and dict.__getitem__.

.. date: 2022-08-28-10-51-19 .. gh-issue: 96352 .. nonce: jTLD2d .. section: Core and Builtins

Fix :exc:AttributeError missing name and obj attributes in :meth:object.__getattribute__. Patch by Philip Georgi.

.. date: 2022-08-26-18-46-32 .. gh-issue: 93554 .. nonce: QEaCcK .. section: Core and Builtins

Change the jump opcodes so that all conditional jumps are forward jumps. Backward jumps are converted by the assembler into a conditional forward jump whose target is the fallthrough block (and with a reversed condition), followed by an unconditional backward jump. For example:

POP_JUMP_IF_TRUE BACKWARD_TARGET becomes POP_JUMP_IF_FALSE NEXT_BLOCK; JUMP BACKWARD_TARGET.

All the directed conditional jump opcodes were removed: POP_JUMP_FORWARD_IF_TRUE, POP_JUMP_BACKWARD_IF_TRUE, POP_JUMP_FORWARD_IF_FALSE, POP_JUMP_BACKWARD_IF_FALSE, POP_JUMP_FORWARD_IF_NONE, POP_JUMP_BACKWARD_IF_NONE, POP_JUMP_FORWARD_IF_NOT_NONE, POP_JUMP_BACKWARD_IF_NOT_NONE.

The corresponding opcodes without direction are no longer pseudo-instructions, and they implement the forward conditional jumps.

.. date: 2022-08-25-10-19-34 .. gh-issue: 96268 .. nonce: AbYrLB .. section: Core and Builtins

Loading a file with invalid UTF-8 will now report the broken character at the correct location.

.. date: 2022-08-24-14-30-26 .. gh-issue: 96237 .. nonce: msif5f .. section: Core and Builtins

The internal field _PyInterpreterFrame.f_func is renamed to _PyInterpreterFrame.f_funcobj and may be any object. The f_globals and f_builtin fields may hold junk values.

It is safest to treat the _PyInterpreterFrame struct as opaque.

.. date: 2022-08-22-21-33-28 .. gh-issue: 96187 .. nonce: W_6SRG .. section: Core and Builtins

Fixed a bug that caused _PyCode_GetExtra to return garbage for negative indexes. Patch by Pablo Galindo

.. date: 2022-08-20-18-36-40 .. gh-issue: 96143 .. nonce: nh3GFM .. section: Core and Builtins

Add a new -X perf Python command line option as well as :func:sys.activate_stack_trampoline and :func:sys.deactivate_stack_trampoline function in the :mod:sys module that allows to set/unset the interpreter in a way that the Linux perf profiler can detect Python calls. The new :func:sys.is_stack_trampoline_active function allows to query the state of the perf trampoline. Design by Pablo Galindo. Patch by Pablo Galindo and Christian Heimes with contributions from Gregory P. Smith [Google] and Mark Shannon.

.. date: 2022-08-19-06-51-17 .. gh-issue: 96071 .. nonce: mVgPAo .. section: Core and Builtins

Fix a deadlock in :c:func:PyGILState_Ensure when allocating new thread state. Patch by Kumar Aditya.

.. date: 2022-08-18-13-47-59 .. gh-issue: 96046 .. nonce: 5Hqbka .. section: Core and Builtins

:c:func:PyType_Ready now initializes ht_cached_keys and performs additional checks to ensure that type objects are properly configured. This avoids crashes in 3rd party packages that don't use regular API to create new types.

.. date: 2022-08-15-21-08-11 .. gh-issue: 96005 .. nonce: 6eoc8k .. section: Core and Builtins

On WASI :const:~errno.ENOTCAPABLE is now mapped to :exc:PermissionError. The :mod:errno modules exposes the new error number. getpath.py now ignores :exc:PermissionError when it cannot open landmark files pybuilddir.txt and pyenv.cfg.

.. date: 2022-08-15-20-52-41 .. gh-issue: 93678 .. nonce: X7GuIJ .. section: Core and Builtins

Added test a harness for direct unit tests of the compiler's optimization stage. The _testinternalcapi.optimize_cfg() function runs the optimiser on a sequence of instructions. The CfgOptimizationTestCase class in test.support has utilities for invoking the optimizer and checking the output.

.. date: 2022-08-15-12-41-14 .. gh-issue: 95245 .. nonce: N4gOUV .. section: Core and Builtins

Reduces the size of a "simple" Python object from 8 to 6 words by moving the weakreflist pointer into the pre-header directly before the object's dict/values pointer.

.. date: 2022-08-15-11-58-05 .. gh-issue: 90997 .. nonce: bWwV8Q .. section: Core and Builtins

Compile virtual :keyword:try/:keyword:except blocks to handle exceptions raised during :meth:~generator.close or :meth:~generator.throw calls through a suspended frame.

.. date: 2022-08-14-10-04-44 .. gh-issue: 95977 .. nonce: gCTZb9 .. section: Core and Builtins

Optimized calling :meth:~object.__get__ with vectorcall. Patch by Kumar Aditya.

.. date: 2022-08-12-18-13-49 .. gh-issue: 91210 .. nonce: AWMSLj .. section: Core and Builtins

Improve error message when a parameter without a default value follows one with a default value, and show the same message, even when the non-default/default sequence is preceded by positional-only parameters.

.. date: 2022-08-12-13-04-25 .. gh-issue: 95922 .. nonce: YNCtyX .. section: Core and Builtins

Fixed bug where the compiler's eliminate_empty_basic_blocks function ignores the last block of the code unit.

.. date: 2022-08-11-11-01-56 .. gh-issue: 95818 .. nonce: iClLdl .. section: Core and Builtins

Skip over incomplete frames in :c:func:PyThreadState_GetFrame.

.. date: 2022-08-11-09-19-55 .. gh-issue: 95876 .. nonce: YpQfoV .. section: Core and Builtins

Fix format string in _PyPegen_raise_error_known_location that can lead to memory corruption on some 64bit systems. The function was building a tuple with i (int) instead of n (Py_ssize_t) for Py_ssize_t arguments.

.. date: 2022-08-04-18-46-54 .. gh-issue: 95605 .. nonce: FbpCoG .. section: Core and Builtins

Fix misleading contents of error message when converting an all-whitespace string to :class:float.

.. date: 2022-07-31-13-23-12 .. gh-issue: 95150 .. nonce: 67FXVo .. section: Core and Builtins

Update code object hashing and equality to consider all debugging and exception handling tables. This fixes an issue where certain non-identical code objects could be "deduplicated" during compilation.

.. date: 2022-07-31-03-22-58 .. gh-issue: 91146 .. nonce: Y2Hziy .. section: Core and Builtins

Reduce allocation size of :class:list from :meth:str.split and :meth:str.rsplit. Patch by Donghee Na and Inada Naoki.

.. date: 2022-07-28-19-07-06 .. gh-issue: 87092 .. nonce: 73IPS1 .. section: Core and Builtins

Create a 'jump target label' abstraction in the compiler so that the compiler's codegen stage does not work directly with basic blocks. This prepares the code for changes to the underlying CFG generation mechanism.

.. date: 2022-07-28-08-33-31 .. gh-issue: 95355 .. nonce: yN4XVk .. section: Core and Builtins

_PyPegen_Parser_New now properly detects token memory allocation errors. Patch by Honglin Zhu.

.. date: 2022-07-27-14-21-57 .. gh-issue: 90081 .. nonce: HVAS5x .. section: Core and Builtins

Run Python code in tracer/profiler function at full speed. Fixes slowdown in earlier versions of 3.11.

.. date: 2022-07-27-14-05-07 .. gh-issue: 95324 .. nonce: 28Q5u7 .. section: Core and Builtins

Emit a warning in debug mode if an object does not call :c:func:PyObject_GC_UnTrack before deallocation. Patch by Pablo Galindo.

.. date: 2022-07-26-12-59-03 .. gh-issue: 95245 .. nonce: GHWczn .. section: Core and Builtins

Merge managed dict and values pointer into a single tagged pointer to save one word in the pre-header.

.. date: 2022-07-26-09-31-12 .. gh-issue: 93678 .. nonce: W8vvgT .. section: Core and Builtins

Add cfg_builder struct and refactor the relevant code so that a cfg can be constructed without an instance of the compiler struct.

.. date: 2022-07-24-00-27-47 .. gh-issue: 95185 .. nonce: ghYTZx .. section: Core and Builtins

Prevented crashes in the AST constructor when compiling some absurdly long expressions like "+0"*1000000. :exc:RecursionError is now raised instead. Patch by Pablo Galindo

.. date: 2022-07-23-19-16-25 .. gh-issue: 93351 .. nonce: 0Jyvu- .. section: Core and Builtins

:class:ast.AST node positions are now validated when provided to :func:compile and other related functions. If invalid positions are detected, a :exc:ValueError will be raised.

.. date: 2022-07-22-12-53-34 .. gh-issue: 94438 .. nonce: hNqACc .. section: Core and Builtins

Fix an issue that caused extended opcode arguments and some conditional pops to be ignored when calculating valid jump targets for assignments to the f_lineno attribute of frame objects. In some cases, this could cause inconsistent internal state, resulting in a hard crash of the interpreter.

.. date: 2022-07-21-19-19-20 .. gh-issue: 95060 .. nonce: 4xdT1f .. section: Core and Builtins

Undocumented PyCode_Addr2Location function now properly returns when addrq argument is less than zero.

.. date: 2022-07-21-17-54-52 .. gh-issue: 95113 .. nonce: NnSLpT .. section: Core and Builtins

Replace all EXTENDED_ARG_QUICK instructions with basic :opcode:EXTENDED_ARG instructions in unquickened code. Consumers of non-adaptive bytecode should be able to handle extended arguments the same way they were handled in CPython 3.10 and older.

.. date: 2022-07-20-13-46-01 .. gh-issue: 91409 .. nonce: dhL8Zo .. section: Core and Builtins

Fix incorrect source location info caused by certain optimizations in the bytecode compiler.

.. date: 2022-07-20-09-04-55 .. gh-issue: 95023 .. nonce: bs-xd7 .. section: Library

Implement :func:os.setns and :func:os.unshare for Linux. Patch by Noam Cohen.

.. date: 2022-07-19-16-30-59 .. gh-issue: 94036 .. nonce: _6Utkm .. section: Core and Builtins

Fix incorrect source location info for some multi-line attribute accesses and method calls.

.. date: 2022-07-19-09-41-55 .. gh-issue: 94938 .. nonce: xYBlM7 .. section: Core and Builtins

Fix error detection in some builtin functions when keyword argument name is an instance of a str subclass with overloaded __eq__ and __hash__. Previously it could cause SystemError or other undesired behavior.

.. date: 2022-07-19-04-34-56 .. gh-issue: 94996 .. nonce: dV564A .. section: Library

:func:ast.parse will no longer parse function definitions with positional-only params when passed feature_version less than (3, 8). Patch by Shantanu Jain.

.. date: 2022-07-18-14-19-21 .. gh-issue: 94739 .. nonce: NQJQi7 .. section: Core and Builtins

Allow jumping within, out of, and across exception handlers in the debugger.

.. date: 2022-07-18-05-10-29 .. gh-issue: 94949 .. nonce: OsZ7_s .. section: Library

:func:ast.parse will no longer parse parenthesized context managers when passed feature_version less than (3, 9). Patch by Shantanu Jain.

.. date: 2022-07-18-04-48-34 .. gh-issue: 94947 .. nonce: df9gUw .. section: Library

:func:ast.parse will no longer parse assignment expressions when passed feature_version less than (3, 8). Patch by Shantanu Jain.

.. date: 2022-07-17-15-54-29 .. gh-issue: 91256 .. nonce: z7i7Q5 .. section: Core and Builtins

Ensures the program name is known for help text during interpreter startup.

.. date: 2022-07-16-08-14-17 .. gh-issue: 94869 .. nonce: eRwMsX .. section: Core and Builtins

Fix the column offsets for some expressions in multi-line f-strings :mod:ast nodes. Patch by Pablo Galindo.

.. date: 2022-07-15-22-47-44 .. gh-issue: 94893 .. nonce: YiJYcW .. section: Core and Builtins

Fix an issue where frame object manipulations could corrupt inline bytecode caches.

.. date: 2022-07-15-22-16-08 .. gh-issue: 94822 .. nonce: zRRzBN .. section: Core and Builtins

Fix an issue where lookups of metaclass descriptors may be ignored when an identically-named attribute also exists on the class itself.

.. date: 2022-07-15-16-15-04 .. gh-issue: 91153 .. nonce: HiBmtt .. section: Core and Builtins

Fix an issue where a :class:bytearray item assignment could crash if it's resized by the new value's :meth:__index__ method.

.. date: 2022-07-14-10-07-53 .. gh-issue: 90699 .. nonce: x3aG9m .. section: Core and Builtins

Fix reference counting bug in :meth:bool.__repr__. Patch by Kumar Aditya.

.. date: 2022-07-08-16-44-11 .. gh-issue: 94694 .. nonce: VkL2CM .. section: Core and Builtins

Fix an issue that could cause code with multi-line method lookups to have misleading or incorrect column offset information. In some cases (when compiling a hand-built AST) this could have resulted in a hard crash of the interpreter.

.. date: 2022-07-08-11-44-45 .. gh-issue: 93252 .. nonce: i2358c .. section: Core and Builtins

Fix an issue that caused internal frames to outlive failed Python function calls, possibly resulting in memory leaks or hard interpreter crashes.

.. date: 2022-07-07-21-13-25 .. gh-issue: 94215 .. nonce: _Sv9Ms .. section: Core and Builtins

Fix an issue where exceptions raised by line-tracing events would cause frames to be left in an invalid state, possibly resulting in a hard crash of the interpreter.

.. date: 2022-07-06-14-02-26 .. gh-issue: 92228 .. nonce: 44Cbly .. section: Core and Builtins

Disable the compiler's inline-small-exit-blocks optimization for exit blocks that are associated with source code lines. This fixes a bug where the debugger cannot tell where an exception handler ends and the following code block begins.

.. date: 2022-07-01-20-00-19 .. gh-issue: 94485 .. nonce: mo5st7 .. section: Core and Builtins

Line number of a module's RESUME instruction is set to 0 as specified in :pep:626.

.. date: 2022-06-30-15-07-26 .. gh-issue: 94438 .. nonce: btzHSk .. section: Core and Builtins

Account for instructions that can push NULL to the stack when setting line number in a frame. Prevents some (unlikely) crashes.

.. date: 2022-06-29-22-18-36 .. gh-issue: 91719 .. nonce: 3APYYI .. section: Core and Builtins

Reload opcode when raising unknown opcode error in the interpreter main loop, for C compilers to generate dispatching code independently.

.. date: 2022-06-29-15-45-04 .. gh-issue: 94329 .. nonce: olUQyk .. section: Core and Builtins

Compile and run code with unpacking of extremely large sequences (1000s of elements). Such code failed to compile. It now compiles and runs correctly.

.. date: 2022-06-28-14-20-36 .. gh-issue: 94360 .. nonce: DiEnen .. section: Core and Builtins

Fixed a tokenizer crash when reading encoded files with syntax errors from stdin with non utf-8 encoded text. Patch by Pablo Galindo

.. date: 2022-06-28-12-41-17 .. gh-issue: 88116 .. nonce: A7fEl_ .. section: Core and Builtins

Fix an issue when reading line numbers from code objects if the encoded line numbers are close to INT_MIN. Patch by Pablo Galindo

.. date: 2022-06-28-10-08-06 .. gh-issue: 94262 .. nonce: m-HWUZ .. section: Core and Builtins

Don't create frame objects for incomplete frames. Prevents the creation of generators and closures from being observable to Python and C extensions, restoring the behavior of 3.10 and earlier.

.. date: 2022-06-26-14-37-03 .. gh-issue: 94192 .. nonce: ab7tn7 .. section: Core and Builtins

Fix error for dictionary literals with invalid expression as value.

.. date: 2022-06-25-10-19-43 .. gh-issue: 87995 .. nonce: aMDHnp .. section: Core and Builtins

:class:types.MappingProxyType instances are now hashable if the underlying mapping is hashable.

.. date: 2022-06-24-14-06-20 .. gh-issue: 93883 .. nonce: 8jVQQ4 .. section: Core and Builtins

Revise the display strategy of traceback enhanced error locations. The indicators are only shown when the location doesn't span the whole line.

.. date: 2022-06-23-12-10-39 .. gh-issue: 94163 .. nonce: SqAfQq .. section: Core and Builtins

Add :opcode:BINARY_SLICE and :opcode:STORE_SLICE instructions for more efficient handling and better specialization of slicing operations, where the slice is explicit in the source code.

.. date: 2022-06-20-13-48-57 .. gh-issue: 94021 .. nonce: o78q3G .. section: Core and Builtins

Fix unreachable code warning in Python/specialize.c.

.. date: 2022-06-18-17-00-33 .. gh-issue: 93911 .. nonce: y286of .. section: Core and Builtins

Specialize LOAD_ATTR for objects with custom __getattribute__.

.. date: 2022-06-17-16-30-24 .. gh-issue: 93955 .. nonce: LmiAe9 .. section: Core and Builtins

Improve performance of attribute lookups on objects with custom __getattribute__ and __getattr__. Patch by Ken Jin.

.. date: 2022-06-16-16-53-22 .. gh-issue: 93911 .. nonce: RDwIiK .. section: Core and Builtins

Specialize LOAD_ATTR for property() attributes.

.. date: 2022-06-15-16-45-53 .. gh-issue: 93678 .. nonce: 1I_ZT3 .. section: Core and Builtins

Refactor compiler optimisation code so that it no longer needs the struct assembler and struct compiler passed around. Instead, each function takes the CFG and other data that it actually needs. This will make it possible to test this code directly.

.. date: 2022-06-15-11-16-13 .. gh-issue: 93841 .. nonce: 06zqX3 .. section: Core and Builtins

When built with -enable-pystats, sys._stats_on(), sys._stats_off(), sys._stats_clear() and sys._stats_dump() functions have been added to enable gathering stats for parts of programs.

.. date: 2022-06-13-13-55-34 .. gh-issue: 93516 .. nonce: HILrDl .. section: Core and Builtins

Store offset of first traceable instruction in code object to avoid having to recompute it for each instruction when tracing.

.. date: 2022-06-13-10-48-09 .. gh-issue: 93516 .. nonce: yJSait .. section: Core and Builtins

Lazily create a table mapping bytecode offsets to line numbers to speed up calculation of line numbers when tracing.

.. date: 2022-06-12-19-31-56 .. gh-issue: 89828 .. nonce: bq02M7 .. section: Core and Builtins

:class:types.GenericAlias no longer relays the __class__ attribute. For example, isinstance(list[int], type) no longer returns True.

.. date: 2022-06-10-16-57-35 .. gh-issue: 93678 .. nonce: 1WBnHt .. section: Core and Builtins

Refactor the compiler to reduce boilerplate and repetition.

.. date: 2022-06-10-12-03-17 .. gh-issue: 93671 .. nonce: idkQqG .. section: Core and Builtins

Fix some exponential backtrace case happening with deeply nested sequence patterns in match statements. Patch by Pablo Galindo

.. date: 2022-06-10-10-31-18 .. gh-issue: 93662 .. nonce: -7RSC1 .. section: Core and Builtins

Make sure that the end column offsets are correct in multi-line method calls. Previously, the end column could precede the column offset.

.. date: 2022-06-09-19-19-02 .. gh-issue: 93461 .. nonce: 5DqP1e .. section: Library

:func:importlib.invalidate_caches now drops entries from :data:sys.path_importer_cache with a relative path as name. This solves a caching issue when a process changes its current working directory.

FileFinder no longer inserts a dot in the path, e.g. /egg/./spam is now /egg/spam.

.. date: 2022-06-09-09-08-29 .. gh-issue: 93621 .. nonce: -_Pn1d .. section: Core and Builtins

Change order of bytecode instructions emitted for :keyword:with and :keyword:async with to reduce the number of entries in the exception table.

.. date: 2022-06-06-14-28-24 .. gh-issue: 93533 .. nonce: lnC0CC .. section: Core and Builtins

Reduce the size of the inline cache for LOAD_METHOD by 2 bytes.

.. date: 2022-06-02-23-00-08 .. gh-issue: 93444 .. nonce: m63DIs .. section: Core and Builtins

Removed redundant fields from the compiler's basicblock struct: b_nofallthrough, b_exit, b_return. They can be easily calculated from the opcode of the last instruction of the block.

.. date: 2022-06-02-08-28-55 .. gh-issue: 93429 .. nonce: DZTWHx .. section: Core and Builtins

LOAD_METHOD instruction has been removed. It was merged back into LOAD_ATTR.

.. date: 2022-06-01-17-47-40 .. gh-issue: 93418 .. nonce: 24dJuc .. section: Core and Builtins

Fixed an assert where an f-string has an equal sign '=' following an expression, but there's no trailing brace. For example, f"{i=".

.. date: 2022-05-31-16-36-30 .. gh-issue: 93382 .. nonce: Jf6gAj .. section: Core and Builtins

Cache the result of :c:func:PyCode_GetCode function to restore the O\ (1) lookup of the :attr:~types.CodeType.co_code attribute.

.. date: 2022-05-30-19-00-38 .. gh-issue: 93359 .. nonce: zXV3A0 .. section: Core and Builtins

Ensure that custom :mod:ast nodes without explicit end positions can be compiled. Patch by Pablo Galindo.

.. date: 2022-05-30-15-51-11 .. gh-issue: 93356 .. nonce: l5wnzW .. section: Core and Builtins

Code for exception handlers is emitted at the end of the code unit's bytecode. This avoids one jump when no exception is raised.

.. date: 2022-05-30-15-35-42 .. gh-issue: 93354 .. nonce: RZk8gs .. section: Core and Builtins

Use exponential backoff for specialization counters in the interpreter. Can reduce the number of failed specializations significantly and avoid slowdown for those parts of a program that are not suitable for specialization.

.. date: 2022-05-30-14-50-03 .. gh-issue: 93283 .. nonce: XDO2ZQ .. section: Core and Builtins

Improve error message for invalid syntax of conversion character in f-string expressions.

.. date: 2022-05-30-10-22-46 .. gh-issue: 93345 .. nonce: gi1A4L .. section: Core and Builtins

Fix a crash in substitution of a TypeVar in nested generic alias after TypeVarTuple.

.. date: 2022-05-25-21-56-25 .. gh-issue: 93223 .. nonce: gTOGVZ .. section: Core and Builtins

When a bytecode instruction jumps to an unconditional jump instruction, the first instruction can often be optimized to target the unconditional jump's target directly. For tracing reasons, this would previously only occur if both instructions have the same line number. This also now occurs if the unconditional jump is artificial, i.e., if it has no associated line number.

.. date: 2022-05-25-12-30-12 .. gh-issue: 84694 .. nonce: 5sjy2w .. section: Core and Builtins

The --experimental-isolated-subinterpreters configure option and EXPERIMENTAL_ISOLATED_SUBINTERPRETERS macro have been removed.

.. date: 2022-05-25-04-07-22 .. gh-issue: 91924 .. nonce: -UyO4q .. section: Core and Builtins

Fix __lltrace__ debug feature if the stdout encoding is not UTF-8. Patch by Victor Stinner.

.. date: 2022-05-24-14-35-48 .. gh-issue: 93040 .. nonce: 9X6Ofu .. section: Core and Builtins

Wraps unused parameters in Objects/obmalloc.c with Py_UNUSED.

.. date: 2022-05-23-18-36-07 .. gh-issue: 93143 .. nonce: X1Yqxm .. section: Core and Builtins

Avoid NULL checks for uninitialized local variables by determining at compile time which variables must be initialized.

.. date: 2022-05-22-02-37-50 .. gh-issue: 93061 .. nonce: r70Imp .. section: Core and Builtins

Backward jumps after async for loops are no longer given dubious line numbers.

.. date: 2022-05-21-23-21-37 .. gh-issue: 93065 .. nonce: 5I18WC .. section: Core and Builtins

Fix contextvars HAMT implementation to handle iteration over deep trees.

The bug was discovered and fixed by Eli Libman. See MagicStack/immutables#84 <https://github.com/MagicStack/immutables/issues/84>_ for more details.

.. date: 2022-05-20-13-32-24 .. gh-issue: 93012 .. nonce: e9B-pv .. section: Core and Builtins

Added the new function :c:func:PyType_FromMetaclass, which generalizes the existing :c:func:PyType_FromModuleAndSpec using an additional metaclass argument. This is useful for language binding tools, where it can be used to intercept type-related operations like subclassing or static attribute access by specifying a metaclass with custom slots.

Importantly, :c:func:PyType_FromMetaclass is available in the Limited API, which provides a path towards migrating more binding tools onto the Stable ABI.

.. date: 2022-05-20-09-25-34 .. gh-issue: 93021 .. nonce: k3Aji2 .. section: Core and Builtins

Fix the :attr:__text_signature__ for :meth:__get__ methods implemented in C. Patch by Jelle Zijlstra.

.. date: 2022-05-19-15-29-53 .. gh-issue: 89914 .. nonce: 8bAffH .. section: Core and Builtins

The operand of the YIELD_VALUE instruction is set to the stack depth. This is done to help frame handling on yield and may assist debuggers.

.. date: 2022-05-19-13-25-50 .. gh-issue: 92955 .. nonce: kmNV33 .. section: Core and Builtins

Fix memory leak in code object's lines and positions iterators as they were not finalized at exit. Patch by Kumar Aditya.

.. date: 2022-05-18-18-34-45 .. gh-issue: 92930 .. nonce: kpYPOb .. section: Core and Builtins

Fixed a crash in _pickle.c from mutating collections during __reduce__ or persistent_id.

.. date: 2022-05-18-12-55-35 .. gh-issue: 90690 .. nonce: TKuoTa .. section: Core and Builtins

The PRECALL instruction has been removed. It offered only a small advantage for specialization and is not needed in the vast majority of cases.

.. date: 2022-05-18-08-32-33 .. gh-issue: 92914 .. nonce: tJUeTD .. section: Core and Builtins

Always round the allocated size for lists up to the nearest even number.

.. date: 2022-05-17-20-41-43 .. gh-issue: 92858 .. nonce: eIXJTn .. section: Core and Builtins

Improve error message for some suites with syntax error before ':'

.. date: 2022-05-15-15-25-05 .. gh-issue: 90473 .. nonce: MoPHYW .. section: Core and Builtins

Decrease default recursion limit on WASI to address limited call stack size.

.. date: 2022-05-14-13-22-11 .. gh-issue: 92804 .. nonce: rAqpI2 .. section: Core and Builtins

Fix memory leak in memoryview iterator as it was not finalized at exit. Patch by Kumar Aditya.

.. date: 2022-05-13-12-36-10 .. gh-issue: 92777 .. nonce: Odo4vP .. section: Core and Builtins

Specialize LOAD_METHOD for objects with lazy dictionaries. Patch by Ken Jin.

.. date: 2022-05-13-00-57-18 .. gh-issue: 92658 .. nonce: YdhFE2 .. section: Core and Builtins

Add support for connecting and binding to Hyper-V sockets on Windows Hyper-V hosts and guests.

.. date: 2022-05-12-13-23-19 .. gh-issue: 92236 .. nonce: sDRzUe .. section: Core and Builtins

Remove spurious "LINE" event when starting a generator or coroutine, visible tracing functions implemented in C.

.. date: 2022-05-11-09-16-54 .. gh-issue: 91102 .. nonce: lenv9h .. section: Library

:meth:!_warnings.warn_explicit is ported to Argument Clinic.

.. date: 2022-05-10-11-34-35 .. gh-issue: 92619 .. nonce: u0V0lY .. section: Core and Builtins

Make the compiler duplicate an exit block only if none of its instructions have a lineno (previously only the first instruction in the block was checked, leading to unnecessarily duplicated blocks).

.. date: 2022-05-08-19-43-31 .. gh-issue: 88750 .. nonce: 1BjJg- .. section: Core and Builtins

The deprecated debug build only PYTHONTHREADDEBUG environment variable no longer does anything.

.. date: 2022-05-03-20-12-18 .. gh-issue: 92261 .. nonce: aigLnb .. section: Library

Fix hang when trying to iterate over a typing.Union.

.. date: 2022-04-24-02-22-10 .. gh-issue: 91432 .. nonce: YPJAK6 .. section: Core and Builtins

Specialized the :opcode:FOR_ITER opcode using the PEP 659 machinery

.. date: 2022-04-16-15-37-55 .. gh-issue: 91399 .. nonce: trLbK6 .. section: Core and Builtins

Removed duplicate '{0, 0, 0, 0, 0, 0}' entry in 'Objects/unicodetype_db.h'.

.. date: 2022-04-15-22-12-53 .. gh-issue: 91578 .. nonce: rDOtyK .. section: Core and Builtins

Updates the error message for abstract class.

.. bpo: 47091 .. date: 2022-03-22-13-12-27 .. nonce: tJcy-P .. section: Core and Builtins

Improve performance of repetition of :class:list and :class:tuple by using memcpy to copy data and performing the reference increments in one step.

.. bpo: 46142 .. date: 2022-01-02-14-53-59 .. nonce: WayjgT .. section: Core and Builtins

Make --help output shorter by moving some info to the new --help-env and --help-xoptions command-line options. Also add --help-all option to print complete usage.

.. bpo: 42316 .. date: 2020-11-15-02-08-43 .. nonce: LqdkWK .. section: Core and Builtins

Document some places where an assignment expression needs parentheses.

.. date: 2022-10-23-18-30-39 .. gh-issue: 89237 .. nonce: kBui30 .. section: Library

Fix hang on Windows in subprocess.wait_closed() in :mod:asyncio with :class:~asyncio.ProactorEventLoop. Patch by Kumar Aditya.

.. date: 2022-10-19-09-29-12 .. gh-issue: 97928 .. nonce: xj3im7 .. section: Library

:meth:tkinter.Text.count raises now an exception for options starting with "-" instead of silently ignoring them.

.. date: 2022-10-18-15-41-37 .. gh-issue: 98393 .. nonce: vhPu4L .. section: Library

The :mod:os module no longer accepts bytes-like paths, like :class:bytearray and :class:memoryview types: only the exact :class:bytes type is accepted for bytes strings. Patch by Victor Stinner.

.. date: 2022-10-17-12-49-02 .. gh-issue: 98363 .. nonce: aFmSP- .. section: Library

Added itertools.batched() to batch data into lists of a given length with the last list possibly being shorter than the others.

.. date: 2022-10-16-15-31-50 .. gh-issue: 98331 .. nonce: Y5kPOX .. section: Library

Update the bundled copies of pip and setuptools to versions 22.3 and 65.5.0 respectively.

.. date: 2022-10-16-06-18-59 .. gh-issue: 98307 .. nonce: b2_CDu .. section: Library

A :meth:~logging.handlers.SysLogHandler.createSocket method was added to :class:~logging.handlers.SysLogHandler.

.. date: 2022-10-14-19-57-37 .. gh-issue: 96035 .. nonce: 0xcX-p .. section: Library

Fix bug in :func:urllib.parse.urlparse that causes certain port numbers containing whitespace, underscores, plus and minus signs, or non-ASCII digits to be incorrectly accepted.

.. date: 2022-10-14-12-29-05 .. gh-issue: 98257 .. nonce: aMSMs2 .. section: Library

Make :func:sys.setprofile and :func:sys.settrace functions reentrant. They can no long fail with: RuntimeError("Cannot install a trace function while another trace function is being installed"). Patch by Victor Stinner.

.. date: 2022-10-14-11-46-31 .. gh-issue: 98251 .. nonce: Uxc9al .. section: Library

Allow :mod:venv to pass along :envvar:!PYTHON* variables to ensurepip and pip when they do not impact path resolution

.. date: 2022-10-12-11-20-54 .. gh-issue: 94597 .. nonce: GYJZlb .. section: Library

Deprecated :meth:asyncio.AbstractEventLoopPolicy.get_child_watcher and :meth:asyncio.AbstractEventLoopPolicy.set_child_watcher methods to be removed in Python 3.14. Patch by Kumar Aditya.

.. date: 2022-10-12-10-00-40 .. gh-issue: 98178 .. nonce: hspH51 .. section: Library

On macOS, fix a crash in :func:syslog.syslog in multi-threaded applications. On macOS, the libc syslog() function is not thread-safe, so :func:syslog.syslog no longer releases the GIL to call it. Patch by Victor Stinner.

.. date: 2022-10-10-09-52-21 .. gh-issue: 44098 .. nonce: okcqJt .. section: Library

Release the GIL when creating :class:mmap.mmap objects on Unix.

.. date: 2022-10-09-12-12-38 .. gh-issue: 87730 .. nonce: ClgP3f .. section: Library

Wrap network errors consistently in urllib FTP support, so the test suite doesn't fail when a network is available but the public internet is not reachable.

.. date: 2022-10-08-06-59-46 .. gh-issue: 94597 .. nonce: TsS0oT .. section: Library

The child watcher classes :class:~asyncio.MultiLoopChildWatcher, :class:~asyncio.FastChildWatcher and :class:~asyncio.SafeChildWatcher are deprecated and will be removed in Python 3.14. Patch by Kumar Aditya.

.. date: 2022-10-07-09-52-37 .. gh-issue: 98023 .. nonce: aliEcl .. section: Library

Change default child watcher to :class:~asyncio.PidfdChildWatcher on Linux systems which supports it. Patch by Kumar Aditya.

.. date: 2022-10-06-23-42-00 .. gh-issue: 90985 .. nonce: s280JY .. section: Library

Earlier in 3.11 we deprecated asyncio.Task.cancel("message"). We realized we were too harsh, and have undeprecated it.

.. date: 2022-10-06-17-59-22 .. gh-issue: 65961 .. nonce: SXlQnI .. section: Library

Do not rely solely on __cached__ on modules; code will also support __spec__.cached.

.. date: 2022-10-05-20-52-17 .. gh-issue: 97646 .. nonce: Q4fVww .. section: Library

Replace deprecated application/javascript with text/javascript in :mod:mimetypes. See :rfc:9239. Patch by Noam Cohen.

.. date: 2022-10-05-16-10-24 .. gh-issue: 97930 .. nonce: NPSrzE .. section: Library

Apply changes from importlib_resources 5.8 and 5.9: Traversable.joinpath provides a concrete implementation. as_file now supports directories of resources.

.. date: 2022-10-05-11-40-02 .. gh-issue: 97850 .. nonce: NzdREm .. section: Library

Remove deprecated :func:!importlib.util.set_loader and :func:!importlib.util.module_for_loader from :mod:importlib.util.

.. date: 2022-10-04-21-21-41 .. gh-issue: 97837 .. nonce: 19q-eg .. section: Library

Change deprecate warning message in :mod:unittest from

It is deprecated to return a value!=None

It is deprecated to return a value that is not None from a test case

.. date: 2022-10-04-07-55-19 .. gh-issue: 97825 .. nonce: mNdv1l .. section: Library

Fixes :exc:AttributeError when :meth:subprocess.check_output is used with argument input=None and either of the arguments encoding or errors are used.

.. date: 2022-10-04-00-43-43 .. gh-issue: 97008 .. nonce: 3rjtt6 .. section: Library

:exc:NameError and :exc:AttributeError spelling suggestions provided since :gh:82711 are now also emitted by the pure Python :mod:traceback module. Tests for those suggestions now exercise both implementations to ensure they are equivalent. Patch by Carl Friedrich Bolz-Tereick and Łukasz Langa.

.. date: 2022-10-03-14-42-13 .. gh-issue: 97799 .. nonce: Y1iJvf .. section: Library

:mod:dataclass now uses :func:inspect.get_annotations to examine the annotations on class objects.

.. date: 2022-10-03-13-25-19 .. gh-issue: 97781 .. nonce: gCLLef .. section: Library

Removed deprecated interfaces in importlib.metadata (entry points accessed as dictionary, implicit dictionary construction of sequence of EntryPoint objects, mutablility of EntryPoints result, access of entry point by index). entry_points now has a simpler, more straightforward API (returning EntryPoints).

.. date: 2022-09-30-15-56-20 .. gh-issue: 96827 .. nonce: lzy1iw .. section: Library

Avoid spurious tracebacks from :mod:asyncio when default executor cleanup is delayed until after the event loop is closed (e.g. as the result of a keyboard interrupt).

.. date: 2022-09-30-09-22-37 .. gh-issue: 95534 .. nonce: ndEfPj .. section: Library

:meth:gzip.GzipFile.read reads 10% faster.

.. date: 2022-09-29-23-22-24 .. gh-issue: 97592 .. nonce: tpJg_J .. section: Library

Avoid a crash in the C version of :meth:asyncio.Future.remove_done_callback when an evil argument is passed.

.. date: 2022-09-29-08-15-55 .. gh-issue: 97639 .. nonce: JSjWYW .. section: Library

Remove tokenize.NL check from :mod:tabnanny.

.. date: 2022-09-25-23-24-52 .. gh-issue: 97545 .. nonce: HZLSNt .. section: Library

Make Semaphore run faster.

.. date: 2022-09-25-20-42-33 .. gh-issue: 73588 .. nonce: uVtjEA .. section: Library

Fix generation of the default name of :class:tkinter.Checkbutton. Previously, checkbuttons in different parent widgets could have the same short name and share the same state if arguments "name" and "variable" are not specified. Now they are globally unique.

.. date: 2022-09-24-18-56-23 .. gh-issue: 96865 .. nonce: o9WUkW .. section: Library

fix Flag to use boundary CONFORM

This restores previous Flag behavior of allowing flags with non-sequential values to be combined; e.g.

class Skip(Flag): TWO = 2 EIGHT = 8

Skip.TWO | Skip.EIGHT -> <Skip.TWO|EIGHT: 10>

.. date: 2022-09-22-14-35-02 .. gh-issue: 97005 .. nonce: yf21Q7 .. section: Library

Update bundled libexpat to 2.4.9

.. date: 2022-09-22-11-50-29 .. gh-issue: 85760 .. nonce: DETTPd .. section: Library

Fix race condition in :mod:asyncio where :meth:~asyncio.SubprocessProtocol.process_exited called before the :meth:~asyncio.SubprocessProtocol.pipe_data_received leading to inconsistent output. Patch by Kumar Aditya.

.. date: 2022-09-18-04-51-30 .. gh-issue: 96704 .. nonce: DmamRX .. section: Library

Pass the correct contextvars.Context when a asyncio exception handler is called on behalf of a task or callback handle. This adds a new Task method, get_context, and also a new Handle method with the same name. If this method is not found on a task object (perhaps because it is a third-party library that does not yet provide this method), the context prevailing at the time the exception handler is called is used.

.. date: 2022-09-17-13-15-10 .. gh-issue: 96819 .. nonce: 6RfqM7 .. section: Library

Fixed check in :mod:multiprocessing.resource_tracker that guarantees that the length of a write to a pipe is not greater than PIPE_BUF.

.. date: 2022-09-16-07-53-29 .. gh-issue: 95865 .. nonce: oHjX0A .. section: Library

Reduce :func:urllib.parse.quote_from_bytes memory use on large values.

Contributed by Dennis Sweeney.

.. date: 2022-09-15-00-37-33 .. gh-issue: 96741 .. nonce: 4b6czN .. section: Library

Corrected type annotation for dataclass attribute pstats.FunctionProfile.ncalls to be str.

.. date: 2022-09-13-15-12-31 .. gh-issue: 96734 .. nonce: G08vjz .. section: Library

Update :mod:unicodedata database to Unicode 15.0.0.

.. date: 2022-09-10-16-46-16 .. gh-issue: 96735 .. nonce: 0YzJuG .. section: Library

Fix undefined behaviour in :func:struct.unpack.

.. date: 2022-09-08-20-12-48 .. gh-issue: 46412 .. nonce: r_cfTh .. section: Library

Improve performance of bool(db) for large ndb/gdb databases. Previously this would call len(db) which would iterate over all keys -- the answer (empty or not) is known after the first key.

.. date: 2022-09-07-22-49-37 .. gh-issue: 96652 .. nonce: YqOKxI .. section: Library

Fix the faulthandler implementation of faulthandler.register(signal, chain=True) if the sigaction() function is not available: don't call the previous signal handler if it's NULL. Patch by Victor Stinner.

.. date: 2022-09-04-12-32-52 .. gh-issue: 68163 .. nonce: h6TJCc .. section: Library

Correct conversion of :class:numbers.Rational's to :class:float.

.. date: 2022-09-03-18-39-05 .. gh-issue: 96538 .. nonce: W156-D .. section: Library

Speed up bisect.bisect() functions by taking advantage of type-stability.

.. date: 2022-09-01-13-54-38 .. gh-issue: 96465 .. nonce: 0IJmrH .. section: Library

Fraction hashes are now cached.

.. date: 2022-08-31-11-10-21 .. gh-issue: 96079 .. nonce: uqrXdJ .. section: Library

In :mod:typing, fix missing field name and incorrect __module__ in _AnnotatedAlias.

.. date: 2022-08-30-12-32-00 .. gh-issue: 96415 .. nonce: 6W7ORH .. section: Library

Remove types._cell_factory from module namespace.

.. date: 2022-08-30-11-46-36 .. gh-issue: 95987 .. nonce: CV7_u4 .. section: Library

Fix repr of Any subclasses.

.. date: 2022-08-29-16-54-36 .. gh-issue: 96388 .. nonce: dCpJcu .. section: Library

Work around missing socket functions in :class:~socket.socket's __repr__.

.. date: 2022-08-29-15-28-39 .. gh-issue: 96385 .. nonce: uLRTsf .. section: Library

Fix TypeVarTuple.__typing_prepare_subst__. TypeError was not raised when using more than one TypeVarTuple, like [*T, *V] in type alias substitutions.

.. date: 2022-08-29-12-49-30 .. gh-issue: 96142 .. nonce: PdCMez .. section: Library

Add match_args, kw_only, slots, and weakref_slot to _DataclassParams.

.. date: 2022-08-29-12-35-28 .. gh-issue: 96073 .. nonce: WaGstf .. section: Library

In :mod:inspect, fix overeager replacement of "typing." in formatting annotations.

.. date: 2022-08-29-07-04-03 .. gh-issue: 89258 .. nonce: ri7ncj .. section: Library

Added a :meth:~logging.Logger.getChildren method to :class:logging.Logger, to get the immediate child loggers of a logger.

.. date: 2022-08-27-23-16-09 .. gh-issue: 96346 .. nonce: jJX14I .. section: Library

Use double caching for compiled RE patterns.

.. date: 2022-08-27-21-26-52 .. gh-issue: 96349 .. nonce: XyYLlO .. section: Library

Fixed a minor performance regression in :func:threading.Event.__init__

.. date: 2022-08-27-14-38-49 .. gh-issue: 90467 .. nonce: VOOB0p .. section: Library

Fix :class:asyncio.streams.StreamReaderProtocol to keep a strong reference to the created task, so that it's not garbage collected

.. date: 2022-08-23-13-30-30 .. gh-issue: 96172 .. nonce: 7WTHer .. section: Library

Fix a bug in unicodedata: east_asian_width used to return the wrong value for unassigned characters; and for yet unassigned, but reserved characters.

.. date: 2022-08-22-18-42-17 .. gh-issue: 96159 .. nonce: 3bFU39 .. section: Library

Fix a performance regression in logging TimedRotatingFileHandler. Only check for special files when the rollover time has passed.

.. date: 2022-08-22-13-54-20 .. gh-issue: 96175 .. nonce: bH7zGU .. section: Library

Fix unused localName parameter in the Attr class in :mod:xml.dom.minidom.

.. date: 2022-08-20-12-56-15 .. gh-issue: 96145 .. nonce: 8ah3pE .. section: Library

Add AttrDict to JSON module for use with object_hook.

.. date: 2022-08-20-10-31-01 .. gh-issue: 96052 .. nonce: a6FhaD .. section: Library

Fix handling compiler warnings (SyntaxWarning and DeprecationWarning) in :func:codeop.compile_command when checking for incomplete input. Previously it emitted warnings and raised a SyntaxError. Now it always returns None for incomplete input without emitting any warnings.

.. date: 2022-08-19-18-21-01 .. gh-issue: 96125 .. nonce: ODcF1Y .. section: Library

Fix incorrect condition that causes sys.thread_info.name to be wrong on pthread platforms.

.. date: 2022-08-19-10-19-32 .. gh-issue: 96019 .. nonce: b7uAVP .. section: Library

Fix a bug in the makeunicodedata.py script leading to about 13 KiB of space saving in the unicodedata module, specifically the character decomposition data.

.. date: 2022-08-18-14-53-53 .. gh-issue: 95463 .. nonce: GpP05c .. section: Library

Remove an incompatible change from :issue:28080 that caused a regression that ignored the utf8 in ZipInfo.flag_bits. Patch by Pablo Galindo.

.. date: 2022-08-14-18-59-54 .. gh-issue: 69142 .. nonce: 6is5Pq .. section: Library

Add %:z strftime format code (generates tzoffset with colons as separator), see :ref:strftime-strptime-behavior.

.. date: 2022-08-11-18-52-17 .. gh-issue: 95899 .. nonce: _Bi4uG .. section: Library

Fix :class:asyncio.Runner to call :func:asyncio.set_event_loop only once to avoid calling :meth:~asyncio.AbstractChildWatcher.attach_loop multiple times on child watchers. Patch by Kumar Aditya.

.. date: 2022-08-11-18-22-29 .. gh-issue: 95736 .. nonce: LzRZXe .. section: Library

Fix :class:unittest.IsolatedAsyncioTestCase to set event loop before calling setup functions. Patch by Kumar Aditya.

.. date: 2022-08-11-03-16-48 .. gh-issue: 95865 .. nonce: 0IOkFP .. section: Library

Speed up :func:urllib.parse.quote_from_bytes by replacing a list comprehension with map().

.. date: 2022-08-10-17-34-07 .. gh-issue: 95861 .. nonce: qv-T5s .. section: Library

Add support for computing Spearman's correlation coefficient to the existing statistics.correlation() function.

.. date: 2022-08-10-11-54-04 .. gh-issue: 95804 .. nonce: i5FCFK .. section: Library

Fix logging shutdown handler so it respects MemoryHandler.flushOnClose.

.. date: 2022-08-08-01-42-11 .. gh-issue: 95704 .. nonce: MOPFfX .. section: Library

When a task catches :exc:asyncio.CancelledError and raises some other error, the other error should generally not silently be suppressed.

.. date: 2022-08-07-14-56-23 .. gh-issue: 95149 .. nonce: U0c6Ib .. section: Library

The :class:HTTPStatus <http.HTTPStatus> enum offers a couple of properties to indicate the HTTP status category e.g. HTTPStatus.OK.is_success.

.. date: 2022-08-03-21-01-17 .. gh-issue: 95609 .. nonce: xxyjyX .. section: Library

Update bundled pip to 22.2.2.

.. date: 2022-08-03-16-52-32 .. gh-issue: 95289 .. nonce: FMnHlV .. section: Library

Fix :class:asyncio.TaskGroup to propagate exception when :exc:asyncio.CancelledError was replaced with another exception by a context manager. Patch by Kumar Aditya and Guido van Rossum.

.. date: 2022-07-29-20-58-37 .. gh-issue: 94909 .. nonce: YjMusj .. section: Library

Fix incorrect joining of relative Windows paths with drives in :class:pathlib.PurePath initializer.

.. date: 2022-07-28-17-14-38 .. gh-issue: 95385 .. nonce: 6YlsDI .. section: Library

Faster json.dumps() when sorting of keys is not requested (default).

.. date: 2022-07-27-19-47-51 .. gh-issue: 83901 .. nonce: OSw06c .. section: Library

Improve :meth:Signature.bind <inspect.Signature.bind> error message for missing keyword-only arguments.

.. date: 2022-07-27-19-43-07 .. gh-issue: 95339 .. nonce: NuVQ68 .. section: Library

Update bundled pip to 22.2.1.

.. date: 2022-07-27-11-35-45 .. gh-issue: 95045 .. nonce: iysT-Q .. section: Library

Fix GC crash when deallocating _lsprof.Profiler by untracking it before calling any callbacks. Patch by Kumar Aditya.

.. date: 2022-07-25-15-45-06 .. gh-issue: 95231 .. nonce: i807-g .. section: Library

Fail gracefully if :const:~errno.EPERM or :const:~errno.ENOSYS is raised when loading :mod:!crypt methods. This may happen when trying to load MD5 on a Linux kernel with :abbr:FIPS (Federal Information Processing Standard) enabled.

.. date: 2022-07-24-18-00-42 .. gh-issue: 95097 .. nonce: lu5qNf .. section: Library

Fix :func:asyncio.run for :class:asyncio.Task implementations without :meth:~asyncio.Task.uncancel method. Patch by Kumar Aditya.

.. date: 2022-07-24-12-59-02 .. gh-issue: 95087 .. nonce: VvqXkN .. section: Library

Fix IndexError in parsing invalid date in the :mod:email module.

.. date: 2022-07-24-12-00-06 .. gh-issue: 95199 .. nonce: -5A64k .. section: Library

Upgrade bundled setuptools to 63.2.0.

.. date: 2022-07-24-09-15-35 .. gh-issue: 95194 .. nonce: ERVmqG .. section: Library

Upgrade bundled pip to 22.2.

.. date: 2022-07-23-10-50-05 .. gh-issue: 93899 .. nonce: VT34A5 .. section: Library

Fix check for existence of :const:os.EFD_CLOEXEC, :const:os.EFD_NONBLOCK and :const:os.EFD_SEMAPHORE flags on older kernel versions where these flags are not present. Patch by Kumar Aditya.

.. date: 2022-07-23-10-42-05 .. gh-issue: 95166 .. nonce: xw6p3C .. section: Library

Fix :meth:concurrent.futures.Executor.map to cancel the currently waiting on future on an error - e.g. TimeoutError or KeyboardInterrupt.

.. date: 2022-07-22-21-18-17 .. gh-issue: 95132 .. nonce: n9anlw .. section: Library

Fix a :mod:sqlite3 regression where *args and **kwds were incorrectly relayed from :py:func:~sqlite3.connect to the :class:~sqlite3.Connection factory. The regression was introduced in 3.11a1 with PR 24421 (:gh:85128). Patch by Erlend E. Aasland.

.. date: 2022-07-22-17-19-57 .. gh-issue: 93157 .. nonce: RXByAk .. section: Library

Fix :mod:fileinput module didn't support errors option when inplace is true.

.. date: 2022-07-22-09-09-08 .. gh-issue: 91212 .. nonce: 53O8Ab .. section: Library

Fixed flickering of the turtle window when the tracer is turned off. Patch by Shin-myoung-serp.

.. date: 2022-07-22-00-58-49 .. gh-issue: 95077 .. nonce: 4Z6CNC .. section: Library

Add deprecation warning for enum member.member access (e.g. Color.RED.BLUE). Remove EnumMeta.__getattr__.

.. date: 2022-07-21-22-59-22 .. gh-issue: 95109 .. nonce: usxA9r .. section: Library

Ensure that timeouts scheduled with :class:asyncio.Timeout that have already expired are delivered promptly.

.. date: 2022-07-21-19-55-49 .. gh-issue: 95105 .. nonce: BIX2Km .. section: Library

:meth:wsgiref.types.InputStream.__iter__ should return Iterator[bytes], not Iterable[bytes]. Patch by Shantanu Jain.

.. date: 2022-07-20-22-49-48 .. gh-issue: 95066 .. nonce: TuCu0E .. section: Library

Replaced assert with exception in :func:ast.parse, when feature_version has an invalid major version. Patch by Shantanu Jain.

.. date: 2022-07-20-00-23-58 .. gh-issue: 77617 .. nonce: XGaqSQ .. section: Library

Add :mod:sqlite3 :ref:command-line interface <sqlite3-cli>. Patch by Erlend Aasland.

.. date: 2022-07-19-15-37-11 .. gh-issue: 95005 .. nonce: iRmZ74 .. section: Library

Replace :c:expr:_PyAccu with :c:expr:_PyUnicodeWriter in JSON encoder and StringIO and remove the :c:expr:_PyAccu implementation.

.. date: 2022-07-17-22-31-32 .. gh-issue: 90085 .. nonce: c4FWcS .. section: Library

Remove -c/--clock and -t/--time CLI options of :mod:timeit. The options had been deprecated since Python 3.3 and the functionality was removed in Python 3.7. Patch by Shantanu Jain.

.. date: 2022-07-15-08-13-51 .. gh-issue: 94857 .. nonce: 9_KvZJ .. section: Library

Fix refleak in _io.TextIOWrapper.reconfigure. Patch by Kumar Aditya.

.. date: 2022-07-14-00-43-52 .. gh-issue: 94821 .. nonce: e17ghU .. section: Library

Fix binding of unix socket to empty address on Linux to use an available address from the abstract namespace, instead of "\0".

.. date: 2022-07-11-10-41-48 .. gh-issue: 94736 .. nonce: EbsgeK .. section: Library

Fix crash when deallocating an instance of a subclass of _multiprocessing.SemLock. Patch by Kumar Aditya.

.. date: 2022-07-09-15-17-02 .. gh-issue: 81620 .. nonce: L0O_bV .. section: Library

Add random.binomialvariate().

.. date: 2022-07-09-08-55-04 .. gh-issue: 74116 .. nonce: 0XwYC1 .. section: Library

Allow :meth:asyncio.StreamWriter.drain to be awaited concurrently by multiple tasks. Patch by Kumar Aditya.

.. date: 2022-07-08-17-49-12 .. gh-issue: 87822 .. nonce: F9dzkf .. section: Library

When called with capture_locals=True, the :mod:traceback module functions swallow exceptions raised from calls to repr() on local variables of frames. This is in order to prioritize the original exception over rendering errors. An indication of the failure is printed in place of the missing value. (Patch by Simon-Martin Schroeder).

.. date: 2022-07-08-08-39-35 .. gh-issue: 88050 .. nonce: 0aOC_m .. section: Library

Fix :mod:asyncio subprocess transport to kill process cleanly when process is blocked and avoid RuntimeError when loop is closed. Patch by Kumar Aditya.

.. date: 2022-07-07-15-46-55 .. gh-issue: 94637 .. nonce: IYEiUM .. section: Library

:meth:SSLContext.set_default_verify_paths now releases the GIL around SSL_CTX_set_default_verify_paths call. The function call performs I/O and CPU intensive work.

.. date: 2022-07-06-22-41-51 .. gh-issue: 94309 .. nonce: _XswsX .. section: Library

Deprecate aliases :class:typing.Hashable and :class:typing.Sized

.. date: 2022-07-06-21-24-03 .. gh-issue: 92546 .. nonce: s5Upkh .. section: Library

An undocumented python -m pprint benchmark is moved into pprint suite of pyperformance. Patch by Oleg Iarygin.

.. date: 2022-07-06-16-01-08 .. gh-issue: 94607 .. nonce: Q6RYfz .. section: Library

Fix subclassing complex generics with type variables in :mod:typing. Previously an error message saying Some type variables ... are not listed in Generic[...] was shown. :mod:typing no longer populates __parameters__ with the __parameters__ of a Python class.

.. date: 2022-07-06-14-57-33 .. gh-issue: 94619 .. nonce: PRqKVX .. section: Library

Remove the long-deprecated module_repr() from :mod:importlib.

.. date: 2022-07-06-14-45-12 .. gh-issue: 93910 .. nonce: iZcp67 .. section: Library

The ability to access the other values of an enum on an enum (e.g. Color.RED.BLUE) has been restored in order to fix a performance regression.

.. date: 2022-07-06-06-02-02 .. gh-issue: 93896 .. nonce: vIgWGr .. section: Library

Fix :func:asyncio.run and :class:unittest.IsolatedAsyncioTestCase to always the set event loop as it was done in Python 3.10 and earlier. Patch by Kumar Aditya.

.. date: 2022-07-05-17-22-00 .. gh-issue: 94343 .. nonce: kf4H5r .. section: Library

Allow setting the attributes of reprlib.Repr during object initialization

.. date: 2022-07-03-16-41-03 .. gh-issue: 94382 .. nonce: zuVZeM .. section: Library

Port static types of _multiprocessing module to heap types. Patch by Kumar Aditya.

.. date: 2022-07-03-16-26-35 .. gh-issue: 78724 .. nonce: XNiJzf .. section: Library

Fix crash in :class:struct.Struct when it was not completely initialized by initializing it in :meth:~object.__new__. Patch by Kumar Aditya.

.. date: 2022-07-02-19-46-30 .. gh-issue: 94510 .. nonce: xOatDC .. section: Library

Re-entrant calls to :func:sys.setprofile and :func:sys.settrace now raise :exc:RuntimeError. Patch by Pablo Galindo.

.. date: 2022-06-29-09-48-37 .. gh-issue: 92336 .. nonce: otA6c6 .. section: Library

Fix bug where :meth:linecache.getline fails on bad files with :exc:UnicodeDecodeError or :exc:SyntaxError. It now returns an empty string as per the documentation.

.. date: 2022-06-29-04-42-56 .. gh-issue: 94398 .. nonce: YOq_bJ .. section: Library

Once a :class:asyncio.TaskGroup has started shutting down (i.e., at least one task has failed and the task group has started cancelling the remaining tasks), it should not be possible to add new tasks to the task group.

.. date: 2022-06-28-14-41-22 .. gh-issue: 94383 .. nonce: CXnquo .. section: Library

:mod:xml.etree: Remove the ElementTree.Element.copy() method of the pure Python implementation, deprecated in Python 3.10, use the :func:copy.copy function instead. The C implementation of :mod:xml.etree has no copy() method, only a __copy__() method. Patch by Victor Stinner.

.. date: 2022-06-28-14-29-21 .. gh-issue: 94379 .. nonce: RrgKfh .. section: Library

:mod:zipimport: Remove find_loader() and find_module() methods, deprecated in Python 3.10: use the find_spec() method instead. See :pep:451 for the rationale. Patch by Victor Stinner.

.. date: 2022-06-28-00-24-48 .. gh-issue: 94352 .. nonce: JY1Ayt .. section: Library

:func:shlex.split: Passing None for s argument now raises an exception, rather than reading :data:sys.stdin. The feature was deprecated in Python 3.9. Patch by Victor Stinner.

.. date: 2022-06-27-10-33-18 .. gh-issue: 94318 .. nonce: jR4_QV .. section: Library

Strip trailing spaces in :mod:pydoc text output.

.. date: 2022-06-26-10-59-15 .. gh-issue: 89988 .. nonce: K8rnmt .. section: Library

Fix memory leak in :class:pickle.Pickler when looking up :attr:dispatch_table. Patch by Kumar Aditya.

.. date: 2022-06-25-23-44-44 .. gh-issue: 90016 .. nonce: EB409s .. section: Library

Deprecate :mod:sqlite3 :ref:default adapters and converters <sqlite3-default-converters>. Patch by Erlend E. Aasland.

.. date: 2022-06-25-16-27-02 .. gh-issue: 94254 .. nonce: beP16v .. section: Library

Fixed types of :mod:struct module to be immutable. Patch by Kumar Aditya.

.. date: 2022-06-25-13-38-53 .. gh-issue: 93259 .. nonce: FAGw-2 .. section: Library

Now raise ValueError when None or an empty string are passed to Distribution.from_name (and other callers).

.. date: 2022-06-25-09-12-23 .. gh-issue: 74696 .. nonce: fxC9ua .. section: Library

:func:shutil.make_archive now passes the root_dir argument to custom archivers which support it.

.. date: 2022-06-24-20-00-57 .. gh-issue: 94216 .. nonce: hxnQPu .. section: Library

The :mod:dis module now has the opcodes for pseudo instructions (those which are used by the compiler during code generation but then removed or replaced by real opcodes before the final bytecode is emitted).

.. date: 2022-06-24-19-40-40 .. gh-issue: 93096 .. nonce: 3RlK2d .. section: Library

Removed undocumented python -m codecs. Use python -m unittest test.test_codecs.EncodedFileTest instead.

.. date: 2022-06-24-19-23-59 .. gh-issue: 94207 .. nonce: VhS1eS .. section: Library

Made :class:!_struct.Struct GC-tracked in order to fix a reference leak in the :mod:!_struct module.

.. date: 2022-06-24-19-16-09 .. gh-issue: 93096 .. nonce: r1_oIc .. section: Library

Removed undocumented -t argument of python -m base64. Use python -m unittest test.test_base64.LegacyBase64TestCase.test_encodebytes instead.

.. date: 2022-06-24-18-20-42 .. gh-issue: 94226 .. nonce: 8ZL4Fm .. section: Library

Remove the :func:locale.format function, deprecated in Python 3.7: use :func:locale.format_string instead. Patch by Victor Stinner.

.. date: 2022-06-24-17-11-33 .. gh-issue: 94199 .. nonce: 7releN .. section: Library

Remove the :func:ssl.match_hostname function. The :func:ssl.match_hostname was deprecated in Python 3.7. OpenSSL performs hostname matching since Python 3.7, Python no longer uses the :func:ssl.match_hostname function. Patch by Victor Stinner.

.. date: 2022-06-24-14-25-26 .. gh-issue: 94214 .. nonce: 03pXR5 .. section: Library

Document the context object used in the venv.EnvBuilder class, and add the new environment's library path to it.

.. date: 2022-06-24-10-39-56 .. gh-issue: 94199 .. nonce: MIuckY .. section: Library

Remove the :func:ssl.wrap_socket function, deprecated in Python 3.7: instead, create a :class:ssl.SSLContext object and call its :class:ssl.SSLContext.wrap_socket method. Any package that still uses :func:ssl.wrap_socket is broken and insecure. The function neither sends a SNI TLS extension nor validates server hostname. Code is subject to :cwe:295 Improper Certificate Validation. Patch by Victor Stinner.

.. date: 2022-06-24-10-29-19 .. gh-issue: 94199 .. nonce: pfehmz .. section: Library

Remove the :func:ssl.RAND_pseudo_bytes function, deprecated in Python 3.6: use :func:os.urandom or :func:ssl.RAND_bytes instead. Patch by Victor Stinner.

.. date: 2022-06-24-10-18-59 .. gh-issue: 94199 .. nonce: kYOo8g .. section: Library

:mod:hashlib: Remove the pure Python implementation of :func:hashlib.pbkdf2_hmac, deprecated in Python 3.10. Python 3.10 and newer requires OpenSSL 1.1.1 (:pep:644): this OpenSSL version provides a C implementation of :func:~hashlib.pbkdf2_hmac which is faster. Patch by Victor Stinner.

.. date: 2022-06-24-09-41-41 .. gh-issue: 94196 .. nonce: r2KyfS .. section: Library

:mod:gzip: Remove the filename attribute of :class:gzip.GzipFile, deprecated since Python 2.6, use the :attr:~gzip.GzipFile.name attribute instead. In write mode, the filename attribute added '.gz' file extension if it was not present. Patch by Victor Stinner.

.. date: 2022-06-24-08-49-47 .. gh-issue: 94182 .. nonce: Wknau0 .. section: Library

run the :class:asyncio.PidfdChildWatcher on the running loop, this allows event loops to run subprocesses when there is no default event loop running on the main thread

.. date: 2022-06-23-14-35-10 .. gh-issue: 94169 .. nonce: jeba90 .. section: Library

Remove io.OpenWrapper and _pyio.OpenWrapper, deprecated in Python 3.10: just use :func:open instead. The :func:open (:func:io.open) function is a built-in function. Since Python 3.10, :func:!_pyio.open is also a static method. Patch by Victor Stinner.

.. date: 2022-06-23-13-12-05 .. gh-issue: 91742 .. nonce: sNytVX .. section: Library

Fix :mod:pdb crash after jump caused by a null pointer dereference. Patch by Kumar Aditya.

.. date: 2022-06-22-11-16-11 .. gh-issue: 94101 .. nonce: V9vDG8 .. section: Library

Manual instantiation of :class:ssl.SSLSession objects is no longer allowed as it lead to misconfigured instances that crashed the interpreter when attributes where accessed on them.

.. date: 2022-06-21-11-40-31 .. gh-issue: 84753 .. nonce: FW1pxO .. section: Library

:func:inspect.iscoroutinefunction, :func:inspect.isgeneratorfunction, and :func:inspect.isasyncgenfunction now properly return True for duck-typed function-like objects like instances of :class:unittest.mock.AsyncMock.

This makes :func:inspect.iscoroutinefunction consistent with the behavior of :func:asyncio.iscoroutinefunction. Patch by Mehdi ABAAKOUK.

.. date: 2022-06-20-23-14-43 .. gh-issue: 94028 .. nonce: UofEcX .. section: Library

Fix a regression in the :mod:sqlite3 where statement objects were not properly cleared and reset after use in cursor iters. The regression was introduced by PR 27884 in Python 3.11a1. Patch by Erlend E. Aasland.

.. date: 2022-06-18-15-06-54 .. gh-issue: 93973 .. nonce: 4y6UQT .. section: Library

Add keyword argument all_errors to asyncio.create_connection so that multiple connection errors can be raised as an ExceptionGroup.

.. date: 2022-06-17-16-00-55 .. gh-issue: 93963 .. nonce: 8YYZ-2 .. section: Library

Officially deprecate from importlib.abc classes moved to importlib.resources.abc.

.. date: 2022-06-17-12-02-30 .. gh-issue: 93858 .. nonce: R49ARc .. section: Library

Prevent error when activating venv in nested fish instances.

.. date: 2022-06-16-11-16-53 .. gh-issue: 93820 .. nonce: 00X0Y5 .. section: Library

Pickle :class:enum.Flag by name.

.. date: 2022-06-16-09-24-50 .. gh-issue: 93847 .. nonce: kuv8bN .. section: Library

Fix repr of enum of generic aliases.

.. date: 2022-06-15-21-35-11 .. gh-issue: 91404 .. nonce: 39TZzW .. section: Library

Revert the :mod:re memory leak when a match is terminated by a signal or memory allocation failure as the implemented fix caused a major performance regression.

.. date: 2022-06-15-21-28-16 .. gh-issue: 83499 .. nonce: u3DQJ- .. section: Library

Fix double closing of file description in :mod:tempfile.

.. date: 2022-06-15-21-20-02 .. gh-issue: 93820 .. nonce: FAMLY8 .. section: Library

Fixed a regression when :func:copy.copy-ing :class:enum.Flag with multiple flag members.

.. date: 2022-06-11-13-32-17 .. gh-issue: 79512 .. nonce: A1KTDr .. section: Library

Fixed names and __module__ value of :mod:weakref classes :class:~weakref.ReferenceType, :class:~weakref.ProxyType, :class:~weakref.CallableProxyType. It makes them pickleable.

.. date: 2022-06-09-17-15-26 .. gh-issue: 91389 .. nonce: OE4vS5 .. section: Library

Fix an issue where :mod:dis utilities could report missing or incorrect position information in the presence of CACHE entries.

.. date: 2022-06-09-14-44-21 .. gh-issue: 93626 .. nonce: sfghs46 .. section: Library

Set __future__.annotations to have a None mandatoryRelease to indicate that it is currently 'TBD'.

.. date: 2022-06-09-10-12-55 .. gh-issue: 90473 .. nonce: 683m_C .. section: Library

Emscripten and WASI have no home directory and cannot provide :pep:370 user site directory.

.. date: 2022-06-08-20-11-02 .. gh-issue: 90494 .. nonce: LIZT85 .. section: Library

:func:copy.copy and :func:copy.deepcopy now always raise a TypeError if __reduce__() returns a tuple with length 6 instead of silently ignore the 6th item or produce incorrect result.

.. date: 2022-06-07-14-53-46 .. gh-issue: 90549 .. nonce: T4FMKY .. section: Library

Fix a multiprocessing bug where a global named resource (such as a semaphore) could leak when a child process is spawned (as opposed to forked).

.. date: 2022-06-06-13-19-43 .. gh-issue: 93521 .. nonce: _vE8m9 .. section: Library

Fixed a case where dataclasses would try to add __weakref__ into the __slots__ for a dataclass that specified weakref_slot=True when it was already defined in one of its bases. This resulted in a TypeError upon the new class being created.

.. date: 2022-06-06-12-58-27 .. gh-issue: 79579 .. nonce: e8rB-M .. section: Library

:mod:sqlite3 now correctly detects DML queries with leading comments. Patch by Erlend E. Aasland.

.. date: 2022-06-05-22-22-42 .. gh-issue: 93421 .. nonce: 43UO_8 .. section: Library

Update :data:sqlite3.Cursor.rowcount when a DML statement has run to completion. This fixes the row count for SQL queries like UPDATE ... RETURNING. Patch by Erlend E. Aasland.

.. date: 2022-06-04-00-11-54 .. gh-issue: 93475 .. nonce: vffFw1 .. section: Library

Expose FICLONE and FICLONERANGE constants in :mod:fcntl. Patch by Illia Volochii.

.. date: 2022-06-03-22-13-28 .. gh-issue: 93370 .. nonce: tjfu9L .. section: Library

Deprecate :data:!version and :data:!version_info.

.. date: 2022-06-02-08-40-58 .. gh-issue: 91810 .. nonce: Gtk44w .. section: Library

Suppress writing an XML declaration in open files in ElementTree.write() with encoding='unicode' and xml_declaration=None.

.. date: 2022-06-01-11-24-13 .. gh-issue: 91162 .. nonce: NxvU_u .. section: Library

Support splitting of unpacked arbitrary-length tuple over TypeVar and TypeVarTuple parameters. For example:

A[T, *Ts][*tuple[int, ...]] -> A[int, *tuple[int, ...]]
A[*Ts, T][*tuple[int, ...]] -> A[*tuple[int, ...], int]

.. date: 2022-05-31-14-58-40 .. gh-issue: 93353 .. nonce: 9Hvm6o .. section: Library

Fix the :func:importlib.resources.as_file context manager to remove the temporary file if destroyed late during Python finalization: keep a local reference to the :func:os.remove function. Patch by Victor Stinner.

.. date: 2022-05-30-21-42-50 .. gh-issue: 83658 .. nonce: 01Ntx0 .. section: Library

Make :class:multiprocessing.Pool raise an exception if maxtasksperchild is not None or a positive int.

.. date: 2022-05-28-08-02-55 .. gh-issue: 93312 .. nonce: HY0Uzj .. section: Library

Add :const:os.PIDFD_NONBLOCK flag to open a file descriptor for a process with :func:os.pidfd_open in non-blocking mode. Patch by Kumar Aditya.

.. date: 2022-05-27-22-17-11 .. gh-issue: 88123 .. nonce: mkYl5q .. section: Library

Implement Enum.__contains__ that returns True or False to replace the deprecated behaviour that would sometimes raise a :exc:TypeError.

.. date: 2022-05-27-13-18-18 .. gh-issue: 93297 .. nonce: e2zuHz .. section: Library

Make asyncio task groups prevent child tasks from being GCed

.. date: 2022-05-27-10-52-06 .. gh-issue: 85308 .. nonce: K6r-tJ .. section: Library

Changed :class:argparse.ArgumentParser to use :term:filesystem encoding and error handler instead of default text encoding to read arguments from file (e.g. fromfile_prefix_chars option). This change affects Windows; argument file should be encoded with UTF-8 instead of ANSI Codepage.

.. date: 2022-05-26-23-10-55 .. gh-issue: 93156 .. nonce: 4XfDVN .. section: Library

Accessing the :attr:pathlib.PurePath.parents sequence of an absolute path using negative index values produced incorrect results.

.. date: 2022-05-26-09-24-41 .. gh-issue: 93162 .. nonce: W1VuhU .. section: Library

Add the ability for :func:logging.config.dictConfig to usefully configure :class:~logging.handlers.QueueHandler and :class:~logging.handlers.QueueListener as a pair, and add :func:logging.getHandlerByName and :func:logging.getHandlerNames APIs to allow access to handlers by name.

.. date: 2022-05-26-08-41-34 .. gh-issue: 93243 .. nonce: uw6x5z .. section: Library

The :mod:!smtpd module was removed per the schedule in :pep:594.

.. date: 2022-05-25-22-09-38 .. gh-issue: 92886 .. nonce: ylwDSc .. section: Library

Replace assert statements with raise AssertionError() in :class:~wsgiref.BaseHandler so that the tested behaviour is maintained running with optimizations (-O).

.. date: 2022-05-25-15-57-39 .. gh-issue: 90155 .. nonce: YMstB5 .. section: Library

Fix broken :class:asyncio.Semaphore when acquire is cancelled.

.. date: 2022-05-25-02-45-41 .. gh-issue: 90817 .. nonce: yxANgU .. section: Library

The :func:locale.resetlocale function is deprecated and will be removed in Python 3.13. Use locale.setlocale(locale.LC_ALL, "") instead. Patch by Victor Stinner.

.. date: 2022-05-25-00-21-28 .. gh-issue: 91513 .. nonce: 9VyCT4 .. section: Library

Added taskName attribute to :mod:logging module for use with :mod:asyncio tasks.

.. date: 2022-05-24-11-19-04 .. gh-issue: 74696 .. nonce: -cnf-A .. section: Library

:func:shutil.make_archive no longer temporarily changes the current working directory during creation of standard .zip or tar archives.

.. date: 2022-05-24-10-59-02 .. gh-issue: 92728 .. nonce: zxTifq .. section: Library

The :func:re.template function and the corresponding :const:re.TEMPLATE and :const:re.T flags are restored after they were removed in 3.11.0b1, but they are now deprecated, so they might be removed from Python 3.13.

.. date: 2022-05-22-23-46-18 .. gh-issue: 93033 .. nonce: wZfiL- .. section: Library

Search in some strings (platform dependent i.e [U+0xFFFF, U+0x0100] on Windows or [U+0xFFFFFFFF, U+0x00010000] on Linux 64-bit) are now up to 10 times faster.

.. date: 2022-05-22-16-08-01 .. gh-issue: 89973 .. nonce: jc-Q4g .. section: Library

Fix :exc:re.error raised in :mod:fnmatch if the pattern contains a character range with upper bound lower than lower bound (e.g. [c-a]). Now such ranges are interpreted as empty ranges.

.. date: 2022-05-21-13-16-16 .. gh-issue: 93044 .. nonce: eJ_XkZ .. section: Library

No longer convert the database argument of :func:sqlite3.connect to bytes before passing it to the factory.

.. date: 2022-05-20-15-52-43 .. gh-issue: 93010 .. nonce: WF-cAc .. section: Library

In a very special case, the email package tried to append the nonexistent InvalidHeaderError to the defect list. It should have been InvalidHeaderDefect.

.. date: 2022-05-19-22-34-42 .. gh-issue: 92986 .. nonce: e6uKxj .. section: Library

Fix :func:ast.unparse when ImportFrom.level is None

.. date: 2022-05-19-17-49-58 .. gh-issue: 92932 .. nonce: o2peTh .. section: Library

Now :func:~dis.dis and :func:~dis.get_instructions handle operand values for instructions prefixed by EXTENDED_ARG_QUICK. Patch by Sam Gross and Donghee Na.

.. date: 2022-05-19-13-33-18 .. gh-issue: 92675 .. nonce: ZeerMZ .. section: Library

Fix :func:venv.ensure_directories to accept :class:pathlib.Path arguments in addition to :class:str paths. Patch by David Foster.

.. date: 2022-05-18-21-04-09 .. gh-issue: 87901 .. nonce: lnf041 .. section: Library

Removed the encoding argument from :func:os.popen that was added in 3.11b1.

.. date: 2022-05-18-17-18-41 .. gh-issue: 91922 .. nonce: DwWIsJ .. section: Library

Fix function :func:sqlite.connect and the :class:sqlite.Connection constructor on non-UTF-8 locales. Also, they now support bytes paths non-decodable with the current FS encoding.

.. date: 2022-05-17-06-27-39 .. gh-issue: 92869 .. nonce: t8oBkw .. section: Library

Added :class:~ctypes.c_time_t to :mod:ctypes, which has the same size as the :c:type:time_t type in C.

.. date: 2022-05-16-14-35-39 .. gh-issue: 92839 .. nonce: owSMyo .. section: Library

Fixed crash resulting from calling bisect.insort() or bisect.insort_left() with the key argument not equal to None.

.. date: 2022-05-14-11-41-23 .. gh-issue: 90473 .. nonce: kPdOZl .. section: Library

:mod:subprocess now fails early on Emscripten and WASI platforms to work around missing :func:os.pipe on WASI.

.. date: 2022-05-14-09-01-38 .. gh-issue: 89325 .. nonce: ys-2BZ .. section: Library

Removed many old deprecated :mod:unittest features: :class:~unittest.TestCase method aliases, undocumented and broken :class:~unittest.TestCase method assertDictContainsSubset, undocumented :meth:TestLoader.loadTestsFromModule <unittest.TestLoader.loadTestsFromModule> parameter use_load_tests, and an underscored alias of the :class:~unittest.TextTestResult class.

.. date: 2022-05-12-15-19-00 .. gh-issue: 92734 .. nonce: d0wjDt .. section: Library

Allow multi-element reprs emitted by :mod:reprlib to be pretty-printed using configurable indentation.

.. date: 2022-05-11-19-33-27 .. gh-issue: 92671 .. nonce: KE4v6a .. section: Library

Fixed :func:ast.unparse for empty tuples in the assignment target context.

.. date: 2022-05-11-14-34-09 .. gh-issue: 91581 .. nonce: glkou2 .. section: Library

:meth:~datetime.datetime.utcfromtimestamp no longer attempts to resolve fold in the pure Python implementation, since the fold is never 1 in UTC. In addition to being slightly faster in the common case, this also prevents some errors when the timestamp is close to :attr:datetime.min <datetime.datetime.min>. Patch by Paul Ganssle.

.. date: 2022-05-11-10-06-31 .. gh-issue: 86388 .. nonce: 7ivUtT .. section: Library

Removed randrange() functionality deprecated since Python 3.10. Formerly, randrange(10.0) losslessly converted to randrange(10). Now, it raises a TypeError. Also, the exception raised for non-integral values such as randrange(10.5) or randrange('10') has been changed from ValueError to TypeError.

.. date: 2022-05-10-16-30-40 .. gh-issue: 90385 .. nonce: 1_wBRQ .. section: Library

Add :meth:pathlib.Path.walk as an alternative to :func:os.walk.

.. date: 2022-05-10-07-57-27 .. gh-issue: 92550 .. nonce: Rk_UzM .. section: Library

Fix :meth:pathlib.Path.rglob for empty pattern.

.. date: 2022-05-09-22-27-11 .. gh-issue: 92591 .. nonce: V7RCk2 .. section: Library

Allow :mod:logging filters to return a :class:logging.LogRecord instance so that filters attached to :class:logging.Handler\ s can enrich records without side effects on other handlers.

.. date: 2022-05-09-21-31-41 .. gh-issue: 92445 .. nonce: tJosdm .. section: Library

Fix a bug in :mod:argparse where nargs="*" would raise an error instead of returning an empty list when 0 arguments were supplied if choice was also defined in parser.add_argument.

.. date: 2022-05-09-11-55-04 .. gh-issue: 92547 .. nonce: CzVZft .. section: Library

Remove undocumented :mod:sqlite3 features deprecated in Python 3.10:

sqlite3.enable_shared_cache()
sqlite3.OptimizedUnicode

Patch by Erlend E. Aasland.

.. date: 2022-05-09-09-28-02 .. gh-issue: 92530 .. nonce: M4Q1RS .. section: Library

Fix an issue that occurred after interrupting :func:threading.Condition.notify.

.. date: 2022-05-09-01-27-25 .. gh-issue: 92531 .. nonce: vV7S_O .. section: Library

The statistics.median_grouped() function now always return a float. Formerly, it did not convert the input type when for sequences of length one.

.. date: 2022-05-08-19-21-14 .. gh-issue: 84131 .. nonce: rG5kI7 .. section: Library

The :class:pathlib.Path deprecated method link_to has been removed. Use 3.10's :meth:~pathlib.Path.hardlink_to method instead as its semantics are consistent with that of :meth:~pathlib.Path.symlink_to.

.. date: 2022-05-08-18-51-14 .. gh-issue: 89336 .. nonce: TL6ip7 .. section: Library

Removed :mod:configparser module APIs: the SafeConfigParser class alias, the ParsingError.filename property and parameter, and the ConfigParser.readfp method, all of which were deprecated since Python 3.2.

.. date: 2022-05-06-13-00-57 .. gh-issue: 92391 .. nonce: s-Lase .. section: Library

Add :meth:~object.__class_getitem__ to :class:csv.DictReader and :class:csv.DictWriter, allowing them to be parameterized at runtime. Patch by Marc Mueller.

.. date: 2022-04-26-18-37-24 .. gh-issue: 91968 .. nonce: fuuH1_ .. section: Library

Add SO_RTABLE and SO_USER_COOKIE constants to :mod:socket.

.. date: 2022-04-25-10-23-01 .. gh-issue: 91810 .. nonce: DOHa6B .. section: Library

:class:~xml.etree.ElementTree.ElementTree method :meth:~xml.etree.ElementTree.ElementTree.write and function :func:~xml.etree.ElementTree.tostring now use the text file's encoding ("UTF-8" if not available) instead of locale encoding in XML declaration when encoding="unicode" is specified.

.. date: 2022-04-24-22-26-45 .. gh-issue: 81790 .. nonce: M5Rvpm .. section: Library

:func:os.path.splitdrive now understands DOS device paths with UNC links (beginning \\?\UNC\). Contributed by Barney Gale.

.. date: 2022-04-21-19-14-29 .. gh-issue: 91760 .. nonce: 54AR-m .. section: Library

Apply more strict rules for numerical group references and group names in regular expressions. Only sequence of ASCII digits is now accepted as a numerical reference. The group name in bytes patterns and replacement strings can now only contain ASCII letters and digits and underscore.

.. date: 2022-04-15-22-07-36 .. gh-issue: 90622 .. nonce: 0C6l8h .. section: Library

Worker processes for :class:concurrent.futures.ProcessPoolExecutor are no longer spawned on demand (a feature added in 3.9) when the multiprocessing context start method is "fork" as that can lead to deadlocks in the child processes due to a fork happening while threads are running.

.. date: 2022-04-15-17-38-55 .. gh-issue: 91577 .. nonce: Ah7cLL .. section: Library

Move imports in :class:~multiprocessing.SharedMemory methods to module level so that they can be executed late in python finalization.

.. date: 2022-04-15-13-16-25 .. gh-issue: 91581 .. nonce: 9OGsrN .. section: Library

Remove an unhandled error case in the C implementation of calls to :meth:datetime.fromtimestamp <datetime.datetime.fromtimestamp> with no time zone (i.e. getting a local time from an epoch timestamp). This should have no user-facing effect other than giving a possibly more accurate error message when called with timestamps that fall on 10000-01-01 in the local time. Patch by Paul Ganssle.

.. date: 2022-04-15-11-29-38 .. gh-issue: 91539 .. nonce: 7WgVuA .. section: Library

Improve performance of urllib.request.getproxies_environment when there are many environment variables

.. date: 2022-04-14-08-37-16 .. gh-issue: 91524 .. nonce: g8PiIu .. section: Library

Speed up the regular expression substitution (functions :func:re.sub and :func:re.subn and corresponding :class:re.Pattern methods) for replacement strings containing group references by 2--3 times.

.. date: 2022-04-12-18-05-40 .. gh-issue: 91447 .. nonce: N_Fs4H .. section: Library

Fix findtext in the xml module to only give an empty string when the text attribute is set to None.

.. date: 2022-04-11-16-55-41 .. gh-issue: 91456 .. nonce: DK3KKl .. section: Library

Deprecate current default auto() behavior: In 3.13 the default will be for for auto() to always return the largest member value incremented by 1, and to raise if incompatible value types are used.

.. bpo: 47231 .. date: 2022-04-08-22-12-11 .. nonce: lvyglt .. section: Library

Fixed an issue with inconsistent trailing slashes in tarfile longname directories.

.. bpo: 39064 .. date: 2022-04-03-19-40-09 .. nonce: 76PbIz .. section: Library

:class:zipfile.ZipFile now raises :exc:zipfile.BadZipFile instead of ValueError when reading a corrupt zip file in which the central directory offset is negative.

.. bpo: 41287 .. date: 2022-04-03-11-25-02 .. nonce: 8CTdwf .. section: Library

Fix handling of the doc argument in subclasses of :func:property.

.. date: 2022-04-01-12-35-44 .. gh-issue: 90005 .. nonce: pvaLHQ .. section: Library

:mod:ctypes dependency libffi is now detected with pkg-config.

.. bpo: 32547 .. date: 2022-04-01-09-43-54 .. nonce: NIUiNC .. section: Library

The constructors for :class:~csv.DictWriter and :class:~csv.DictReader now coerce the fieldnames argument to a :class:list if it is an iterator.

.. bpo: 35540 .. date: 2022-03-22-18-28-55 .. nonce: nyijX9 .. section: Library

Fix :func:dataclasses.asdict crash when :class:collections.defaultdict is present in the attributes.

.. bpo: 47063 .. date: 2022-03-19-04-41-42 .. nonce: nwRfUo .. section: Library

Add an index_pages parameter to support using non-default index page names.

.. bpo: 47025 .. date: 2022-03-16-14-24-14 .. nonce: qtT3CE .. section: Library

Drop support for :class:bytes on :data:sys.path.

.. bpo: 46951 .. date: 2022-03-08-04-46-44 .. nonce: SWAz97 .. section: Library

Order the contents of zipapp archives, to make builds more reproducible.

.. bpo: 42777 .. date: 2022-02-21-01-37-00 .. nonce: nWK3E6 .. section: Library

Implement :meth:pathlib.Path.is_mount for Windows paths.

.. bpo: 46755 .. date: 2022-02-15-12-40-48 .. nonce: zePJfx .. section: Library

In :class:QueueHandler, clear stack_info from :class:LogRecord to prevent stack trace from being written twice.

.. bpo: 45393 .. date: 2022-02-09-23-44-27 .. nonce: 9v5Y8U .. section: Library

Fix the formatting for await x and not x in the operator precedence table when using the :func:help system.

.. bpo: 46642 .. date: 2022-02-05-18-46-54 .. nonce: YI6nHQ .. section: Library

Improve error message when trying to subclass an instance of :data:typing.TypeVar, :data:typing.ParamSpec, :data:typing.TypeVarTuple, etc. Based on patch by Gregory Beauregard.

.. bpo: 46364 .. date: 2022-01-14-10-49-20 .. nonce: SzhlU9 .. section: Library

Restrict use of sockets instead of pipes for stdin of subprocesses created by :mod:asyncio to AIX platform only.

.. bpo: 28249 .. date: 2022-01-09-14-23-00 .. nonce: 4dzB80 .. section: Library

Set :attr:doctest.DocTest.lineno to None when an object does not have :attr:~definition.__doc__.

.. bpo: 46197 .. date: 2022-01-03-15-07-06 .. nonce: Z0djv6 .. section: Library

Fix :mod:ensurepip environment isolation for subprocess running pip.

.. bpo: 45924 .. date: 2021-12-27-15-32-15 .. nonce: 0ZpHX2 .. section: Library

Fix :mod:asyncio incorrect traceback when future's exception is raised multiple times. Patch by Kumar Aditya.

.. bpo: 45046 .. date: 2021-08-29-19-59-16 .. nonce: eGq0NC .. section: Library

Add support of context managers in :mod:unittest: methods :meth:~unittest.TestCase.enterContext and :meth:~unittest.TestCase.enterClassContext of class :class:~unittest.TestCase, method :meth:~unittest.IsolatedAsyncioTestCase.enterAsyncContext of class :class:~unittest.IsolatedAsyncioTestCase and function :func:unittest.enterModuleContext.

.. bpo: 44173 .. date: 2021-08-27-18-07-35 .. nonce: oW92Ev .. section: Library

Enable fast seeking of uncompressed unencrypted :class:zipfile.ZipExtFile

.. bpo: 42627 .. date: 2021-05-22-07-58-59 .. nonce: EejtD0 .. section: Library

Fix incorrect parsing of Windows registry proxy settings

.. bpo: 42047 .. date: 2020-10-15-18-37-12 .. nonce: XDdoSF .. section: Library

Add :func:threading.get_native_id support for DragonFly BSD. Patch by David Carlier.

.. bpo: 14243 .. date: 2020-09-28-04-56-04 .. nonce: YECnxv .. section: Library

The :class:tempfile.NamedTemporaryFile function has a new optional parameter delete_on_close

.. bpo: 41246 .. date: 2020-07-08-20-32-13 .. nonce: 2trYf3 .. section: Library

Give the same callback function for when the overlapped operation is done to the functions recv, recv_into, recvfrom, sendto, send and sendfile inside IocpProactor.

.. bpo: 39264 .. date: 2020-01-09-01-57-12 .. nonce: GsBL9- .. section: Library

Fixed :meth:collections.UserDict.get to not call :meth:~object.__missing__ when a value is not found. This matches the behavior of :class:dict. Patch by Bar Harel.

.. bpo: 38693 .. date: 2019-11-04-22-21-27 .. nonce: w_OAov .. section: Library

:mod:importlib now uses f-strings internally instead of str.format.

.. bpo: 38267 .. date: 2019-09-25-00-37-51 .. nonce: X9Jb5V .. section: Library

Add timeout parameter to :meth:asyncio.loop.shutdown_default_executor. The default value is None, which means the executor will be given an unlimited amount of time. When called from :class:asyncio.Runner or :func:asyncio.run, the default timeout is 5 minutes.

.. bpo: 34828 .. date: 2018-09-28-22-18-03 .. nonce: 5Zyi_S .. section: Library

:meth:sqlite3.Connection.iterdump now handles databases that use AUTOINCREMENT in one or more tables.

.. bpo: 32990 .. date: 2018-09-23-07-47-29 .. nonce: 2FVVTU .. section: Library

Support reading wave files with the WAVE_FORMAT_EXTENSIBLE format in the :mod:wave module.

.. bpo: 26253 .. date: 2017-07-31-13-35-28 .. nonce: 8v_sCs .. section: Library

Allow adjustable compression level for tarfile streams in :func:tarfile.open.

.. date: 2022-10-16-17-34-45 .. gh-issue: 85525 .. nonce: DvkD0v .. section: Documentation

Remove extra row

.. date: 2022-10-11-09-40-50 .. gh-issue: 86404 .. nonce: dEAb8W .. section: Documentation

Deprecated tools make suspicious and rstlint.py are now removed. They have been replaced by :pypi:sphinx-lint.

.. date: 2022-10-02-10-58-52 .. gh-issue: 97741 .. nonce: 39l023 .. section: Documentation

Fix ! in c domain ref target syntax via a conf.py patch, so it works as intended to disable ref target resolution.

.. date: 2022-09-01-17-03-04 .. gh-issue: 96432 .. nonce: 1EJ1-4 .. section: Documentation

Fraction literals now support whitespace around the forward slash, Fraction('2 / 3').

.. date: 2022-08-19-17-07-45 .. gh-issue: 96098 .. nonce: nDp43u .. section: Documentation

Improve discoverability of the higher level concurrent.futures module by providing clearer links from the lower level threading and multiprocessing modules.

.. date: 2022-08-13-20-34-51 .. gh-issue: 95957 .. nonce: W9ZZAx .. section: Documentation

What's New 3.11 now has instructions for how to provide compiler and linker flags for Tcl/Tk and OpenSSL on RHEL 7 and CentOS 7.

.. date: 2022-08-12-01-12-52 .. gh-issue: 95588 .. nonce: PA0FI7 .. section: Documentation

Clarified the conflicting advice given in the :mod:ast documentation about :func:ast.literal_eval being "safe" for use on untrusted input while at the same time warning that it can crash the process. The latter statement is true and is deemed unfixable without a large amount of work unsuitable for a bugfix. So we keep the warning and no longer claim that literal_eval is safe.

.. date: 2022-08-03-13-35-08 .. gh-issue: 91207 .. nonce: eJ4pPf .. section: Documentation

Fix stylesheet not working in Windows CHM htmlhelp docs and add warning that they are deprecated. Contributed by C.A.M. Gerlach.

.. date: 2022-07-30-00-23-11 .. gh-issue: 95454 .. nonce: we7AFm .. section: Documentation

Replaced incorrectly written true/false values in documentation. Patch by Robert O'Shea

.. date: 2022-07-29-23-02-19 .. gh-issue: 95451 .. nonce: -tgB93 .. section: Documentation

Update library documentation with :ref:availability information <wasm-availability> on WebAssembly platforms wasm32-emscripten and wasm32-wasi.

.. date: 2022-07-29-09-04-02 .. gh-issue: 95415 .. nonce: LKTyw6 .. section: Documentation

Use consistent syntax for platform availability. The directive now supports a content body and emits a warning when it encounters an unknown platform.

.. date: 2022-07-07-08-42-05 .. gh-issue: 94321 .. nonce: pmCIPb .. section: Documentation

Document the :pep:246 style protocol type :class:sqlite3.PrepareProtocol.

.. date: 2022-06-19-18-18-22 .. gh-issue: 86128 .. nonce: 39DDTD .. section: Documentation

Document a limitation in ThreadPoolExecutor where its exit handler is executed before any handlers in atexit.

.. date: 2022-06-16-10-10-59 .. gh-issue: 61162 .. nonce: 1ypkG8 .. section: Documentation

Clarify :mod:sqlite3 behavior when :ref:sqlite3-connection-context-manager.

.. date: 2022-06-15-12-12-49 .. gh-issue: 87260 .. nonce: epyI7D .. section: Documentation

Align :mod:sqlite3 argument specs with the actual implementation.

.. date: 2022-05-29-21-22-54 .. gh-issue: 86986 .. nonce: lFXw8j .. section: Documentation

The minimum Sphinx version required to build the documentation is now 3.2.

.. date: 2022-05-26-14-51-25 .. gh-issue: 88831 .. nonce: 5Cccr5 .. section: Documentation

Augmented documentation of asyncio.create_task(). Clarified the need to keep strong references to tasks and added a code snippet detailing how to do this.

.. date: 2022-05-26-11-33-23 .. gh-issue: 86438 .. nonce: kEGGmK .. section: Documentation

Clarify that :option:-W and :envvar:PYTHONWARNINGS are matched literally and case-insensitively, rather than as regular expressions, in :mod:warnings.

.. date: 2022-05-20-18-42-10 .. gh-issue: 93031 .. nonce: c2RdJe .. section: Documentation

Update tutorial introduction output to use 3.10+ SyntaxError invalid range.

.. date: 2022-05-18-23-58-26 .. gh-issue: 92240 .. nonce: bHvYiz .. section: Documentation

Added release dates for "What's New in Python 3.X" for 3.0, 3.1, 3.2, 3.8 and 3.10

.. bpo: 47161 .. date: 2022-03-30-17-56-01 .. nonce: gesHfS .. section: Documentation

Document that :class:pathlib.PurePath does not collapse initial double slashes because they denote UNC paths.

.. bpo: 40838 .. date: 2022-01-13-16-03-15 .. nonce: k3NVCf .. section: Documentation

Document that :func:inspect.getdoc, :func:inspect.getmodule, and :func:inspect.getsourcefile might return None.

.. bpo: 43689 .. date: 2021-04-01-08-09-34 .. nonce: mqCfLe .. section: Documentation

The Differ documentation now also mentions other whitespace characters, which make it harder to understand the diff output.

.. bpo: 38056 .. date: 2019-09-12-08-28-17 .. nonce: 6ktYkc .. section: Documentation

Overhaul the :ref:error-handlers documentation in :mod:codecs.

.. bpo: 13553 .. date: 2017-12-10-19-13-39 .. nonce: gQbZs4 .. section: Documentation

Document tkinter.Tk args.

.. date: 2022-10-20-17-49-50 .. gh-issue: 95027 .. nonce: viRpJB .. section: Tests

On Windows, when the Python test suite is run with the -jN option, the ANSI code page is now used as the encoding for the stdout temporary file, rather than using UTF-8 which can lead to decoding errors. Patch by Victor Stinner.

.. date: 2022-09-08-18-31-26 .. gh-issue: 96624 .. nonce: 5cANM1 .. section: Tests

Fixed the failure of repeated runs of test.test_unittest caused by side effects in test_dotted_but_module_not_loaded.

.. date: 2022-08-22-14-59-42 .. gh-issue: 95243 .. nonce: DeD66V .. section: Tests

Mitigate the inherent race condition from using find_unused_port() in testSockName() by trying to find an unused port a few times before failing. Patch by Ross Burton.

.. date: 2022-08-05-09-57-43 .. gh-issue: 95573 .. nonce: edMdQB .. section: Tests

:source:Lib/test/test_asyncio/test_ssl.py exposed a bug in the macOS kernel where intense concurrent load on non-blocking sockets occasionally causes :const:errno.ENOBUFS ("No buffer space available") to be emitted. FB11063974 filed with Apple, in the mean time as a workaround buffer size used in tests on macOS is decreased to avoid intermittent failures. Patch by Fantix King.

.. date: 2022-07-26-15-22-19 .. gh-issue: 95280 .. nonce: h8HvbP .. section: Tests

Fix problem with test_ssl test_get_ciphers on systems that require perfect forward secrecy (PFS) ciphers.

.. date: 2022-07-24-20-19-05 .. gh-issue: 95212 .. nonce: fHiU4e .. section: Tests

Make multiprocessing test case test_shared_memory_recreate parallel-safe.

.. date: 2022-07-24-17-24-42 .. gh-issue: 95218 .. nonce: zfBLtu .. section: Tests

Move tests for importlib.resources into test_importlib.resources.

.. date: 2022-07-24-16-28-31 .. gh-issue: 93963 .. nonce: UB9azu .. section: Tests

Updated tests to use preferred location for importlib.resources ABCs.

.. date: 2022-07-08-12-22-00 .. gh-issue: 94675 .. nonce: IiTs5f .. section: Tests

Add a regression test for :mod:re exponentional slowdown when using rjsmin.

.. date: 2022-07-05-17-53-13 .. gh-issue: 91330 .. nonce: Qys5IL .. section: Tests

Added more tests for :mod:dataclasses to cover behavior with data descriptor-based fields.

.. date: 2022-06-27-21-27-20 .. gh-issue: 94208 .. nonce: VR6HX- .. section: Tests

test_ssl is now checking for supported TLS version and protocols in more tests.

.. date: 2022-06-27-08-53-40 .. gh-issue: 94315 .. nonce: MoZT9t .. section: Tests

Tests now check for DAC override capability instead of relying on :func:os.geteuid.

.. date: 2022-06-21-17-37-46 .. gh-issue: 54781 .. nonce: BjVAVg .. section: Tests

Rename test_tk to test_tkinter, and rename test_ttk_guionly to test_ttk. Patch by Victor Stinner.

.. date: 2022-06-20-23-04-52 .. gh-issue: 93839 .. nonce: OE3Ybk .. section: Tests

Move Lib/ctypes/test/ to Lib/test/test_ctypes/. Patch by Victor Stinner.

.. date: 2022-06-17-15-20-09 .. gh-issue: 93951 .. nonce: CW1Vv4 .. section: Tests

In test_bdb.StateTestCase.test_skip, avoid including auxiliary importers.

.. date: 2022-06-17-13-55-11 .. gh-issue: 93957 .. nonce: X4ovYV .. section: Tests

Provide nicer error reporting from subprocesses in test_venv.EnsurePipTest.test_with_pip.

.. date: 2022-06-17-13-27-21 .. gh-issue: 93884 .. nonce: 5pvPvl .. section: Tests

Add test cases for :c:func:PyNumber_ToBase that take a large number or a non-int object as parameter.

.. date: 2022-06-16-21-38-18 .. gh-issue: 93852 .. nonce: U_Hl6s .. section: Tests

test_asyncio, test_logging, test_socket and test_socketserver now create AF_UNIX domains in the current directory to no longer fail with OSError("AF_UNIX path too long") if the temporary directory (the :envvar:TMPDIR environment variable) is too long. Patch by Victor Stinner.

.. date: 2022-06-16-17-50-58 .. gh-issue: 93353 .. nonce: JdpATx .. section: Tests

regrtest now checks if a test leaks temporary files or directories if run with -jN option. Patch by Victor Stinner.

.. date: 2022-06-10-21-18-14 .. gh-issue: 84461 .. nonce: 9TAb26 .. section: Tests

run_tests.py now handles cross compiling env vars correctly and pass HOSTRUNNER to regression tests.

.. date: 2022-06-08-22-32-56 .. gh-issue: 93616 .. nonce: e5Kkx2 .. section: Tests

test_modulefinder now creates a temporary directory in ModuleFinderTest.setUp() instead of module scope.

.. date: 2022-06-08-14-17-59 .. gh-issue: 93575 .. nonce: Xb2LNB .. section: Tests

Fix issue with test_unicode test_raiseMemError. The test case now use test.support.calcobjsize to calculate size of PyUnicode structs. :func:sys.getsizeof may return different size when string has UTF-8 memory.

.. date: 2022-06-05-10-16-45 .. gh-issue: 90473 .. nonce: QMu7A8 .. section: Tests

WASI does not have a chmod(2) syscall. :func:os.chmod is now a dummy function on WASI. Skip all tests that depend on working :func:os.chmod.

.. date: 2022-06-04-12-05-31 .. gh-issue: 90473 .. nonce: RSpjF7 .. section: Tests

Skip tests on WASI that require symlinks with absolute paths.

.. date: 2022-06-03-16-26-04 .. gh-issue: 57539 .. nonce: HxWgYO .. section: Tests

Increase calendar test coverage for :meth:calendar.LocaleTextCalendar.formatweekday.

.. date: 2022-06-03-14-18-37 .. gh-issue: 90473 .. nonce: 7iXVRK .. section: Tests

Skip symlink tests on WASI. wasmtime uses openat2(2) with RESOLVE_BENEATH flag, which prevents symlinks with absolute paths.

.. date: 2022-06-03-12-22-44 .. gh-issue: 89858 .. nonce: ftBvjE .. section: Tests

Fix test_embed for out-of-tree builds. Patch by Kumar Aditya.

.. date: 2022-05-25-23-07-15 .. gh-issue: 92886 .. nonce: Aki63_ .. section: Tests

Fixing tests that fail when running with optimizations (-O) in test_imaplib.py.

.. date: 2022-05-25-23-00-35 .. gh-issue: 92886 .. nonce: Y-vrWj .. section: Tests

Fixing tests that fail when running with optimizations (-O) in test_zipimport.py

.. date: 2022-05-25-22-53-30 .. gh-issue: 92886 .. nonce: mIfdtz .. section: Tests

Fixing tests that fail when running with optimizations (-O) in test_py_compile.py

.. date: 2022-05-25-22-43-11 .. gh-issue: 92886 .. nonce: 9HQb9e .. section: Tests

Fixing tests that fail when running with optimizations (-O) in test_sys_settrace.py.

.. date: 2022-05-25-22-34-10 .. gh-issue: 92886 .. nonce: 1Lkt8S .. section: Tests

Fixing tests that fail when running with optimizations (-O) in _test_multiprocessing.py

.. date: 2022-05-12-05-51-06 .. gh-issue: 92670 .. nonce: 7L43Z_ .. section: Tests

Skip test_shutil.TestCopy.test_copyfile_nonexistent_dir test on AIX as the test uses a trailing slash to force the OS consider the path as a directory, but on AIX the trailing slash has no effect and is considered as a file.

.. date: 2022-05-08-15-40-41 .. gh-issue: 92514 .. nonce: Xbf5JY .. section: Tests

Remove unused test.support.BasicTestRunner. Patch by Jelle Zijlstra.

.. bpo: 47016 .. date: 2022-03-14-23-28-17 .. nonce: K-t2QX .. section: Tests

Create a GitHub Actions workflow for verifying bundled pip and setuptools. Patch by Illia Volochii and Adam Turner.

.. date: 2022-09-20-12-43-44 .. gh-issue: 96761 .. nonce: IF29kR .. section: Build

Fix the build process of clang compiler for :program:_bootstrap_python if LTO optimization is applied. Patch by Matthias Görgens and Donghee Na.

.. date: 2022-09-17-11-19-24 .. gh-issue: 96883 .. nonce: p_gr62 .. section: Build

wasm32-emscripten builds for browsers now include :mod:concurrent.futures for :mod:asyncio and :mod:unittest.mock.

.. date: 2022-09-12-18-34-51 .. gh-issue: 85936 .. nonce: tX4VCU .. section: Build

CPython now uses the ThinLTO option as the default policy if the Clang compiler accepts the flag. Patch by Donghee Na.

.. date: 2022-09-11-14-23-49 .. gh-issue: 96729 .. nonce: W4uBWL .. section: Build

Ensure that Windows releases built with Tools\msi\buildrelease.bat are upgradable to and from official Python releases.

.. date: 2022-08-26-11-50-03 .. gh-issue: 96269 .. nonce: x_J5h0 .. section: Build

Shared module targets now depend on new MODULE_DEPS variable, which includes EXPORTSYMS. This fixes a build order issue on unsupported AIX platform.

.. date: 2022-08-26-11-09-11 .. gh-issue: 84461 .. nonce: Nsdn_R .. section: Build

wasm32-emscripten platform no longer builds :mod:resource module, :func:~os.getresuid, :func:~os.getresgid, and their setters. The APIs are stubs and not functional.

.. date: 2022-08-15-10-56-07 .. gh-issue: 95973 .. nonce: Bsswsc .. section: Build

Add a new --with-dsymutil configure option to link debug information in macOS. Patch by Pablo Galindo.

.. date: 2022-08-12-13-06-03 .. gh-issue: 90536 .. nonce: qMpF6p .. section: Build

Use the BOLT post-link optimizer to improve performance, particularly on medium-to-large applications.

.. date: 2022-08-04-15-29-35 .. gh-issue: 93744 .. nonce: svRuqm .. section: Build

Remove the configure --with-cxx-main build option: it didn't work for many years. Remove the MAINCC variable from configure and Makefile. Patch by Victor Stinner.

.. date: 2022-07-26-18-13-34 .. gh-issue: 94801 .. nonce: 9fREfy .. section: Build

Fix a regression in configure script that caused some header checks to ignore custom CPPFLAGS. The regression was introduced in :gh:94802.

.. date: 2022-07-25-09-48-43 .. gh-issue: 95145 .. nonce: ZNS3dj .. section: Build

wasm32-wasi builds no longer depend on WASIX's pthread stubs. Python now has its own stubbed pthread API.

.. date: 2022-07-25-08-59-35 .. gh-issue: 95174 .. nonce: g8woUW .. section: Build

Python now detects missing dup function in WASI and works around some missing :mod:errno, :mod:select, and :mod:socket constants.

.. date: 2022-07-23-21-39-09 .. gh-issue: 95174 .. nonce: 7cYMZR .. section: Build

Python now skips missing :mod:socket functions and methods on WASI. WASI can only create sockets from existing fd / accept and has no netdb.

.. date: 2022-07-21-09-17-01 .. gh-issue: 95085 .. nonce: E9x2S_ .. section: Build

Platforms wasm32-unknown-emscripten and wasm32-unknown-wasi have been promoted to :pep:11 tier 3 platform support.

.. date: 2022-07-14-11-13-26 .. gh-issue: 94847 .. nonce: s3Kr5p .. section: Build

Fixed _decimal module build issue on GCC when compiling with LTO and pydebug. Debug builds no longer force inlining of functions.

.. date: 2022-07-14-02-45-44 .. gh-issue: 94841 .. nonce: lLRTdf .. section: Build

Fix the possible performance regression of :c:func:PyObject_Free compiled with MSVC version 1932.

.. date: 2022-07-13-10-13-10 .. gh-issue: 94801 .. nonce: 3xUB24 .. section: Build

configure now uses custom flags like ZLIB_CFLAGS and ZLIB_LIBS when searching for headers and libraries.

.. date: 2022-07-12-13-39-18 .. gh-issue: 94773 .. nonce: koHKm5 .. section: Build

deepfreeze.py now supports code object with frozensets that contain incompatible, unsortable types.

.. date: 2022-07-08-10-28-23 .. gh-issue: 94682 .. nonce: ZtGt_0 .. section: Build

Build and test with OpenSSL 1.1.1q

.. date: 2022-06-30-17-18-23 .. gh-issue: 90005 .. nonce: EIOOla .. section: Build

Dependencies of :mod:readline and :mod:curses module are now detected in configure script with pkg-config. Only ncurses / ncursesw are detected automatically. The old curses library is not configured automatically. Workaround for missing termcap or tinfo library has been removed.

.. date: 2022-06-30-17-00-54 .. gh-issue: 90005 .. nonce: iiq5qD .. section: Build

Fix building _ctypes extension without pkg-config.

.. date: 2022-06-30-09-57-39 .. gh-issue: 90005 .. nonce: 9-pQyR .. section: Build

_dbm module dependencies are now detected by configure.

.. date: 2022-06-29-08-58-31 .. gh-issue: 94404 .. nonce: 3MadM6 .. section: Build

makesetup now works around an issue with sed on macOS and uses correct CFLAGS for object files that end up in a shared extension. Module CFLAGS are used before PY_STDMODULE_CFLAGS to avoid clashes with system headers.

.. date: 2022-06-28-09-42-10 .. gh-issue: 93939 .. nonce: _VWxKW .. section: Build

C extension modules are now built by configure and make instead of distutils and setup.py.

.. date: 2022-06-27-11-57-15 .. gh-issue: 93939 .. nonce: rv7s8W .. section: Build

The 2to3, idle, and pydoc scripts are now generated and installed by Makefile instead of setup.py.

.. date: 2022-06-25-23-25-47 .. gh-issue: 94280 .. nonce: YhEyW_ .. section: Build

Updated pegen regeneration script on Windows to find and use Python 3.9 or higher. Prior to this, pegen regeneration already required 3.9 or higher, but the script may have used lower versions of Python.

.. date: 2022-06-08-14-28-03 .. gh-issue: 93584 .. nonce: 0xfHOK .. section: Build

Address race condition in Makefile when installing a PGO build. All test and install targets now depend on all target.

.. date: 2022-06-04-12-53-53 .. gh-issue: 93491 .. nonce: ehM211 .. section: Build

configure now detects and reports :pep:11 support tiers.

.. date: 2022-05-31-18-04-58 .. gh-issue: 69093 .. nonce: 6lSa0C .. section: Build

Fix Modules/Setup.stdlib.in rule for _sqlite3 extension.

.. date: 2022-05-25-13-56-00 .. gh-issue: 93207 .. nonce: B9Rubf .. section: Build

va_start() with two parameters, like va_start(args, format), is now required to build Python. va_start() is no longer called with a single parameter. Patch by Kumar Aditya.

.. date: 2022-05-25-05-46-00 .. gh-issue: 93202 .. nonce: T37jtj .. section: Build

Python now always use the %zu and %zd printf formats to format a :c:type:size_t or Py_ssize_t number. Building Python 3.12 requires a C11 compiler, so these printf formats are now always supported. Patch by Victor Stinner.

.. date: 2022-05-12-10-19-15 .. gh-issue: 90473 .. nonce: -syvqK .. section: Build

Disable pymalloc and increase stack size on wasm32-wasi.

.. bpo: 34449 .. date: 2018-08-21-11-10-18 .. nonce: Z3qm3c .. section: Build

Drop invalid compiler switch -fPIC for HP aCC on HP-UX. Patch by Michael Osipov.

.. date: 2022-10-19-20-00-28 .. gh-issue: 98360 .. nonce: O2m6YG .. section: Windows

Fixes :mod:multiprocessing spawning child processes on Windows from a virtual environment to ensure that child processes that also use :mod:multiprocessing to spawn more children will recognize that they are in a virtual environment.

.. date: 2022-10-19-19-35-37 .. gh-issue: 98414 .. nonce: FbHZuS .. section: Windows

Fix :file:py.exe launcher handling of :samp:-V:{<company>}/ option when default preferences have been set in environment variables or configuration files.

.. date: 2022-10-02-11-59-23 .. gh-issue: 97728 .. nonce: dIdlPE .. section: Windows

Fix possible crashes caused by the use of uninitialized variables when pass invalid arguments in :func:os.system on Windows and in Windows-specific modules (like winreg).

.. date: 2022-09-29-23-08-49 .. gh-issue: 90989 .. nonce: no89Q2 .. section: Windows

Made :ref:launcher install per-user by default (unless an all users install already exists), and clarify some text in the installer.

.. date: 2022-09-29-22-27-04 .. gh-issue: 97649 .. nonce: bI7OQU .. section: Windows

The Tools directory is no longer installed on Windows

.. date: 2022-09-23-15-40-04 .. gh-issue: 96965 .. nonce: CsnEGs .. section: Windows

Update libffi to 3.4.3

.. date: 2022-09-07-00-11-33 .. gh-issue: 96577 .. nonce: kV4K_1 .. section: Windows

Fixes a potential buffer overrun in :mod:!msilib.

.. date: 2022-09-05-18-32-47 .. gh-issue: 96559 .. nonce: 561sUd .. section: Windows

Fixes the Windows launcher not using the compatible interpretation of default tags found in configuration files when no tag was passed to the command.

.. date: 2022-08-30-12-01-51 .. gh-issue: 94781 .. nonce: OxO-Gr .. section: Windows

Fix :file:pcbuild.proj to clean previous instances of output files in Python\deepfreeze and Python\frozen_modules directories on Windows. Patch by Charlie Zhao.

.. date: 2022-08-26-00-11-18 .. gh-issue: 89545 .. nonce: zmJMY_ .. section: Windows

Updates :mod:platform code getting the Windows version to use native Windows Management Instrumentation (WMI) queries to determine OS version, type, and architecture.

.. date: 2022-08-10-22-46-48 .. gh-issue: 95733 .. nonce: 2_urOp .. section: Windows

Make certain requirements of the Windows Store package optional to allow installing on earlier updates of Windows.

.. date: 2022-08-04-18-47-54 .. gh-issue: 95656 .. nonce: VJ1d13 .. section: Windows

Enable the :meth:~sqlite3.Connection.enable_load_extension :mod:sqlite3 API.

.. date: 2022-08-04-01-12-27 .. gh-issue: 95587 .. nonce: Fvdv5q .. section: Windows

Fixes some issues where the Windows installer would incorrectly detect certain features of an existing install when upgrading.

.. date: 2022-08-03-00-49-46 .. gh-issue: 94399 .. nonce: KvxHc0 .. section: Windows

Restores the behaviour of :ref:launcher for /usr/bin/env shebang lines, which will now search :envvar:PATH for an executable matching the given command. If none is found, the usual search process is used.

.. date: 2022-07-30-14-18-33 .. gh-issue: 95445 .. nonce: mjrTaq .. section: Windows

Fixes the unsuccessful removal of the HTML document directory when uninstalling with Windows msi.

.. date: 2022-07-28-20-21-38 .. gh-issue: 95359 .. nonce: ywMrgu .. section: Windows

Fix :ref:launcher handling of :file:py.ini commands (it was incorrectly expecting a py_ prefix on keys) and crashes when reading per-user configuration file.

.. date: 2022-07-26-20-33-12 .. gh-issue: 95285 .. nonce: w6fa22 .. section: Windows

Fix :ref:launcher handling of command lines where it is only passed a short executable name.

.. date: 2022-07-16-16-18-32 .. gh-issue: 90844 .. nonce: vwITT3 .. section: Windows

Allow virtual environments to correctly launch when they have spaces in the path.

.. date: 2022-07-12-20-45-43 .. gh-issue: 94772 .. nonce: uNMmdG .. section: Windows

Fix incorrect handling of shebang lines in py.exe launcher

.. date: 2022-06-20-22-32-14 .. gh-issue: 94018 .. nonce: bycC3A .. section: Windows

:mod:zipfile will now remove trailing spaces from path components when extracting files on Windows.

.. date: 2022-06-15-01-03-52 .. gh-issue: 93824 .. nonce: mR4mxu .. section: Windows

Drag and drop of files onto Python files in Windows Explorer has been enabled for Windows ARM64.

.. date: 2022-05-28-19-36-13 .. gh-issue: 43414 .. nonce: NGMJ3g .. section: Windows

:func:os.get_terminal_size now attempts to read the size from any provided handle, rather than only supporting file descriptors 0, 1 and 2.

.. date: 2022-05-19-21-44-25 .. gh-issue: 92817 .. nonce: Jrf-Kv .. section: Windows

Ensures that :file:py.exe will prefer an active virtual environment over default tags specified with environment variables or through a :file:py.ini file.

.. date: 2022-05-19-14-01-30 .. gh-issue: 92984 .. nonce: Dsxnlr .. section: Windows

Explicitly disable incremental linking for non-Debug builds

.. date: 2022-05-16-11-45-06 .. gh-issue: 92841 .. nonce: NQx107 .. section: Windows

:mod:asyncio no longer throws RuntimeError: Event loop is closed on interpreter exit after asynchronous socket activity. Patch by Oleg Iarygin.

.. bpo: 46907 .. date: 2022-05-05-06-27-59 .. nonce: IW-uvT .. section: Windows

Update Windows installer to use SQLite 3.38.4.

.. date: 2022-04-12-18-35-20 .. gh-issue: 91061 .. nonce: x40hSK .. section: Windows

Accept os.PathLike for the argument to winsound.PlaySound

.. bpo: 42658 .. date: 2022-03-20-15-47-35 .. nonce: 16eXtb .. section: Windows

Support native Windows case-insensitive path comparisons by using LCMapStringEx instead of :func:str.lower in :func:ntpath.normcase. Add LCMapStringEx to the :mod:!_winapi module.

.. bpo: 38704 .. date: 2020-01-10-23-33-03 .. nonce: 2Idtdn .. section: Windows

Prevent installation on unsupported Windows versions.

.. date: 2022-10-05-15-26-58 .. gh-issue: 97897 .. nonce: Rf-C6u .. section: macOS

The macOS 13 SDK includes support for the mkfifoat and mknodat system calls. Using the dir_fd option with either :func:os.mkfifo or :func:os.mknod could result in a segfault if cpython is built with the macOS 13 SDK but run on an earlier version of macOS. Prevent this by adding runtime support for detection of these system calls ("weaklinking") as is done for other newer syscalls on macOS.

.. date: 2022-10-15-21-20-40 .. gh-issue: 97527 .. nonce: otAHJM .. section: IDLE

Fix a bug in the previous bugfix that caused IDLE to not start when run with 3.10.8, 3.12.0a1, and at least Microsoft Python 3.10.2288.0 installed without the Lib/test package. 3.11.0 was never affected.

.. date: 2022-08-04-20-07-51 .. gh-issue: 65802 .. nonce: xnThWe .. section: IDLE

Document handling of extensions in Save As dialogs.

.. date: 2022-08-01-23-31-48 .. gh-issue: 95191 .. nonce: U7vryB .. section: IDLE

Include prompts when saving Shell (interactive input and output).

.. date: 2022-07-31-22-15-14 .. gh-issue: 95511 .. nonce: WX6PmB .. section: IDLE

Fix the Shell context menu copy-with-prompts bug of copying an extra line when one selects whole lines.

.. date: 2022-07-30-15-10-39 .. gh-issue: 95471 .. nonce: z3scVG .. section: IDLE

In the Edit menu, move Select All and add a new separator.

.. date: 2022-07-29-11-08-52 .. gh-issue: 95411 .. nonce: dazlqH .. section: IDLE

Enable using IDLE's module browser with .pyw files.

.. date: 2022-07-28-18-56-57 .. gh-issue: 89610 .. nonce: hcosiM .. section: IDLE

Add .pyi as a recognized extension for IDLE on macOS. This allows opening stub files by double clicking on them in the Finder.

.. date: 2022-10-07-22-06-11 .. gh-issue: 68686 .. nonce: 6KNIQ4 .. section: Tools/Demos

Remove ptags and eptags scripts.

.. date: 2022-09-30-18-35-11 .. gh-issue: 97681 .. nonce: -KO1Ba .. section: Tools/Demos

Remove the Tools/demo/ directory which contained old demo scripts. A copy can be found in the old-demos project <https://github.com/gvanrossum/old-demos>_. Patch by Victor Stinner.

.. date: 2022-09-30-14-30-12 .. gh-issue: 97669 .. nonce: gvbgcg .. section: Tools/Demos

Remove outdated example scripts of the Tools/scripts/ directory. A copy can be found in the old-demos project <https://github.com/gvanrossum/old-demos>_. Patch by Victor Stinner.

.. date: 2022-08-29-17-25-13 .. gh-issue: 95853 .. nonce: Ce17cT .. section: Tools/Demos

The wasm_build.py script now pre-builds Emscripten ports, checks for broken EMSDK versions, and warns about pkg-config env vars.

.. date: 2022-08-10-17-08-43 .. gh-issue: 95853 .. nonce: HCjC2m .. section: Tools/Demos

The new tool Tools/wasm/wasm_builder.py automates configure, compile, and test steps for building CPython on WebAssembly platforms.

.. date: 2022-08-05-23-25-59 .. gh-issue: 95731 .. nonce: N2KohU .. section: Tools/Demos

Fix handling of module docstrings in :file:Tools/i18n/pygettext.py.

.. date: 2022-07-04-10-02-02 .. gh-issue: 93939 .. nonce: U6sW6H .. section: Tools/Demos

Add script Tools/scripts/check_modules.py to check and validate builtin and shared extension modules. The script also handles Modules/Setup and will eventually replace setup.py.

.. date: 2022-07-04-01-37-42 .. gh-issue: 94538 .. nonce: 1rgy1Y .. section: Tools/Demos

Fix Argument Clinic output to custom file destinations. Patch by Erlend E. Aasland.

.. date: 2022-06-29-22-47-11 .. gh-issue: 94430 .. nonce: hdov8L .. section: Tools/Demos

Allow parameters named module and self with custom C names in Argument Clinic. Patch by Erlend E. Aasland

.. date: 2022-06-19-14-56-33 .. gh-issue: 86087 .. nonce: R8MkRy .. section: Tools/Demos

The Tools/scripts/parseentities.py script used to parse HTML4 entities has been removed.

.. date: 2022-10-18-16-16-27 .. gh-issue: 98393 .. nonce: 55u4BF .. section: C API

The :c:func:PyUnicode_FSDecoder function no longer accepts bytes-like paths, like :class:bytearray and :class:memoryview types: only the exact :class:bytes type is accepted for bytes strings. Patch by Victor Stinner.

.. date: 2022-10-05-10-43-32 .. gh-issue: 91051 .. nonce: ODDRsQ .. section: C API

Add :c:func:PyType_Watch and related APIs to allow callbacks on :c:func:PyType_Modified.

.. date: 2022-10-03-20-33-24 .. gh-issue: 95756 .. nonce: SSmXlG .. section: C API

Lazily create and cache co_ attributes for better performance for code getters.

.. date: 2022-09-20-01-04-57 .. gh-issue: 96512 .. nonce: msZTjF .. section: C API

Configuration for the :ref:integer string conversion length limitation <int_max_str_digits> now lives in the PyConfig C API struct.

.. date: 2022-08-16-16-54-42 .. gh-issue: 95589 .. nonce: 6xE1ar .. section: C API

Extensions classes that set tp_dictoffset and tp_weaklistoffset lose the support for multiple inheritance, but are now safe. Extension classes should use :c:macro:Py_TPFLAGS_MANAGED_DICT and :c:macro:Py_TPFLAGS_MANAGED_WEAKREF instead.

.. date: 2022-08-08-14-36-31 .. gh-issue: 95781 .. nonce: W_G8YW .. section: C API

An unrecognized format character in :c:func:PyUnicode_FromFormat and :c:func:PyUnicode_FromFormatV now sets a :exc:SystemError. In previous versions it caused all the rest of the format string to be copied as-is to the result string, and any extra arguments discarded.

.. date: 2022-08-03-14-39-08 .. gh-issue: 92678 .. nonce: ozFTEx .. section: C API

Restore the 3.10 behavior for multiple inheritance of C extension classes that store their dictionary at the end of the struct.

.. date: 2022-08-03-13-01-57 .. gh-issue: 92678 .. nonce: DLwONN .. section: C API

Support C extensions using managed dictionaries by setting the Py_TPFLAGS_MANAGED_DICT flag.

.. date: 2022-08-01-16-21-39 .. gh-issue: 93274 .. nonce: QoDHEu .. section: C API

API for implementing vectorcall (:c:macro:Py_TPFLAGS_HAVE_VECTORCALL, :c:func:PyVectorcall_NARGS and :c:func:PyVectorcall_Call) was added to the limited API and stable ABI.

.. date: 2022-07-31-21-58-27 .. gh-issue: 95504 .. nonce: wy7B1F .. section: C API

Fix sign placement when specifying width or precision in :c:func:PyUnicode_FromFormat and :c:func:PyUnicode_FromFormatV. Patch by Philip Georgi.

.. date: 2022-07-29-15-24-45 .. gh-issue: 93012 .. nonce: -DdGEy .. section: C API

The :c:macro:Py_TPFLAGS_HAVE_VECTORCALL flag is now removed from a class when the class's :py:meth:~object.__call__ method is reassigned. This makes vectorcall safe to use with mutable types (i.e. heap types without the :const:immutable <Py_TPFLAGS_IMMUTABLETYPE> flag). Mutable types that do not override :c:member:~PyTypeObject.tp_call now inherit the :c:macro:Py_TPFLAGS_HAVE_VECTORCALL flag.

.. date: 2022-07-29-10-41-59 .. gh-issue: 95388 .. nonce: aiRSgr .. section: C API

Creating :c:macro:immutable types <Py_TPFLAGS_IMMUTABLETYPE> with mutable bases is deprecated and is planned to be disabled in Python 3.14.

.. date: 2022-07-25-15-54-27 .. gh-issue: 92678 .. nonce: ziZpxz .. section: C API

Adds unstable C-API functions _PyObject_VisitManagedDict and _PyObject_ClearManagedDict to allow C extensions to allow the VM to manage their object's dictionaries.

.. date: 2022-07-19-22-37-40 .. gh-issue: 94936 .. nonce: LGlmKv .. section: C API

Added :c:func:PyCode_GetVarnames, :c:func:PyCode_GetCellvars and :c:func:PyCode_GetFreevars for accessing co_varnames, co_cellvars and co_freevars respectively via the C API.

.. date: 2022-07-17-18-21-40 .. gh-issue: 94930 .. nonce: gPFGDL .. section: C API

Fix SystemError raised when :c:func:PyArg_ParseTupleAndKeywords is used with # in (...) but without PY_SSIZE_T_CLEAN defined.

.. date: 2022-07-12-17-39-32 .. gh-issue: 94731 .. nonce: 9CPJNU .. section: C API

Python again uses C-style casts for most casting operations when compiled with C++. This may trigger compiler warnings, if they are enabled with e.g. -Wold-style-cast or -Wzero-as-null-pointer-constant options for g++.

.. date: 2022-06-17-13-41-38 .. gh-issue: 93937 .. nonce: uKVTEh .. section: C API

The following frame functions and type are now directly available with #include <Python.h>, it's no longer needed to add #include <frameobject.h>:

:c:func:PyFrame_Check
:c:func:PyFrame_GetBack
:c:func:PyFrame_GetBuiltins
:c:func:PyFrame_GetGenerator
:c:func:PyFrame_GetGlobals
:c:func:PyFrame_GetLasti
:c:func:PyFrame_GetLocals
:c:type:PyFrame_Type

Patch by Victor Stinner.

.. date: 2022-06-13-21-37-31 .. gh-issue: 91321 .. nonce: DgJFvS .. section: C API

Fix the compatibility of the Python C API with C++ older than C++11. Patch by Victor Stinner.

.. date: 2022-06-10-23-41-48 .. gh-issue: 91731 .. nonce: fhYUQG .. section: C API

Avoid defining the static_assert when compiling with C++ 11, where this is a keyword and redefining it can lead to undefined behavior. Patch by Pablo Galindo

.. date: 2022-06-10-16-50-27 .. gh-issue: 89546 .. nonce: mX1f10 .. section: C API

:c:func:PyType_FromMetaclass (and other PyType_From* functions) now check that offsets and the base class's :c:member:~PyTypeObject.tp_basicsize fit in the new class's tp_basicsize.

.. date: 2022-06-06-16-04-14 .. gh-issue: 93503 .. nonce: MHJTu8 .. section: C API

Add two new public functions to the public C-API, :c:func:PyEval_SetProfileAllThreads and :c:func:PyEval_SetTraceAllThreads, that allow to set tracing and profiling functions in all running threads in addition to the calling one. Also, two analogous functions to the :mod:threading module (:func:threading.setprofile_all_threads and :func:threading.settrace_all_threads) that allow to do the same from Python. Patch by Pablo Galindo

.. date: 2022-06-04-13-15-41 .. gh-issue: 93442 .. nonce: 4M4NDb .. section: C API

Add C++ overloads for _Py_CAST_impl() to handle 0/NULL. This will allow C++ extensions that pass 0 or NULL to macros using _Py_CAST() to continue to compile.

.. date: 2022-06-03-14-54-41 .. gh-issue: 93466 .. nonce: DDtH0X .. section: C API

Slot IDs in PyType_Spec may not be repeated. The documentation was updated to mention this. For some cases of repeated slots, PyType_FromSpec and related functions will now raise an exception.

.. date: 2022-05-23-15-22-18 .. gh-issue: 92898 .. nonce: Qjc9d3 .. section: C API

Fix C++ compiler warnings when casting function arguments to PyObject*. Patch by Serge Guelton.

.. date: 2022-05-23-13-33-18 .. gh-issue: 93103 .. nonce: ooD3Eb .. section: C API

Deprecate global configuration variables, like :c:var:Py_IgnoreEnvironmentFlag, in the documentation: the :c:func:Py_InitializeFromConfig API should be instead. Patch by Victor Stinner.

.. date: 2022-05-23-12-31-04 .. gh-issue: 77782 .. nonce: ugC8dn .. section: C API

Deprecate global configuration variable like :c:var:Py_IgnoreEnvironmentFlag: the :c:func:Py_InitializeFromConfig API should be instead. Patch by Victor Stinner.

.. date: 2022-05-19-18-05-51 .. gh-issue: 92913 .. nonce: Ass1Hv .. section: C API

Ensures changes to :c:member:PyConfig.module_search_paths are ignored unless :c:member:PyConfig.module_search_paths_set is set

.. date: 2022-05-13-18-17-48 .. gh-issue: 92781 .. nonce: TVDr3- .. section: C API

Avoid mixing declarations and code in the C API to fix the compiler warning: "ISO C90 forbids mixed declarations and code" [-Werror=declaration-after-statement]. Patch by Victor Stinner.

.. date: 2022-05-11-02-33-10 .. gh-issue: 92651 .. nonce: FIXLf0 .. section: C API

Remove the token.h header file. There was never any public tokenizer C API. The token.h header file was only designed to be used by Python internals. Patch by Victor Stinner.

.. date: 2022-05-10-12-35-42 .. gh-issue: 92536 .. nonce: cAoRCZ .. section: C API

Remove legacy Unicode APIs based on Py_UNICODE*.

.. date: 2022-05-09-23-16-38 .. gh-issue: 85858 .. nonce: VIcNDL .. section: C API

Remove the PyUnicode_InternImmortal() function and the SSTATE_INTERNED_IMMORTAL macro. Patch by Victor Stinner.

.. date: 2022-05-03-19-35-37 .. gh-issue: 92193 .. nonce: 61VoFL .. section: C API

Add new function :c:func:PyFunction_SetVectorcall to the C API which sets the vectorcall field of a given :c:type:PyFunctionObject.

Warning: extensions using this API must preserve the behavior of the unaltered function!

.. date: 2022-04-13-16-10-55 .. gh-issue: 59121 .. nonce: -B7mKp .. section: C API

Fixed an assert that prevented PyRun_InteractiveOne from providing tracebacks when parsing from the provided FD.

.. bpo: 45383 .. date: 2021-10-05-21-59-43 .. nonce: TVClgf .. section: C API

The :c:func:PyType_FromSpec API will now find and use a metaclass based on the provided bases. An error will be raised if there is a metaclass conflict.