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3 days agogh-142186: Revert the unintended value change in the `PY_MONITORING_EVENT_*` values...
scoder [Sat, 25 Apr 2026 07:05:03 +0000 (09:05 +0200)] 
gh-142186: Revert the unintended value change in the `PY_MONITORING_EVENT_*` values from gh-146182 (gh-148955)

https://github.com/python/cpython/pull/146182 left an unintended change in the `PY_MONITORING_*` macro values. This change reverts that part to avoid a user visible impact.

3 days agogh-108951: add TaskGroup.cancel() (#127214)
John Belmonte [Fri, 24 Apr 2026 18:22:05 +0000 (11:22 -0700)] 
gh-108951: add TaskGroup.cancel() (#127214)

Fixes #108951

Co-authored-by: sobolevn <mail@sobolevn.me>
Co-authored-by: Andrew Svetlov <andrew.svetlov@gmail.com>
Co-authored-by: Guido van Rossum <guido@python.org>
4 days agoImprove `hash()` builtin docstring with caveats. (GH-125229)
Gregory P. Smith [Fri, 24 Apr 2026 16:36:46 +0000 (09:36 -0700)] 
Improve  `hash()` builtin docstring with caveats. (GH-125229)

Improve  `hash()` builtin docstring with caveats.

Mention its return type and that the value can be expected to change between
processes (hash randomization).

Why? The `hash` builtin gets reached for and used by a lot of people whether it
is the right tool or not. IDEs surface docstrings and people use pydoc and
`help(hash)`.

4 days agogh-146073: Add fitness/exit quality mechanism for JIT trace frontend (GH-148089)
Hai Zhu [Fri, 24 Apr 2026 09:37:01 +0000 (17:37 +0800)] 
gh-146073: Add fitness/exit quality mechanism for JIT trace frontend (GH-148089)

* Replaces ad-hoc logic for ending traces with a simple inequality: `fitness < exit_quality`
* Fitness starts high and is reduced for branches, backward edges, calls and trace length
* Exit quality reflect how good a spot that instruction is to end a trace. Closing a loop is very, specializable instructions are very low and the others in between.

4 days agogh-145239: Accept unary plus literal pattern (#148566)
Bartosz Sławecki [Thu, 23 Apr 2026 19:07:28 +0000 (21:07 +0200)] 
gh-145239: Accept unary plus literal pattern (#148566)

Add '+' alternatives to signed_number and signed_real_number grammar
rules, mirroring how unary minus is already handled for pattern matching.
Unary plus is a no-op on numbers so the value is returned directly without
wrapping in a UnaryOp node.

4 days agogh-113956: Make intern_common thread-safe in free-threaded build (gh-148886)
Sam Gross [Thu, 23 Apr 2026 18:42:57 +0000 (14:42 -0400)] 
gh-113956: Make intern_common thread-safe in free-threaded build (gh-148886)

Avoid racing with the owning thread's refcount operations when
immortalizing an interned string: if we don't own it and its refcount
isn't merged, intern a copy we own instead. Use atomic stores in
_Py_SetImmortalUntracked so concurrent atomic reads are race-free.

5 days agogh-132631: Fix "I/O operation on closed file" when parsing JSON Lines file (#132632)
Hugo van Kemenade [Thu, 23 Apr 2026 15:27:02 +0000 (18:27 +0300)] 
gh-132631: Fix "I/O operation on closed file" when parsing JSON Lines file (#132632)

Co-authored-by: Brian Schubert <brianm.schubert@gmail.com>
5 days agogh-148663: Document that `calendar.IllegalMonthError` inherits from both `ValueError...
Eoin Shaughnessy [Thu, 23 Apr 2026 14:50:23 +0000 (15:50 +0100)] 
gh-148663: Document that `calendar.IllegalMonthError` inherits from both `ValueError` and `IndexError` (#148664)

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
Co-authored-by: Stan Ulbrych <stan@python.org>
5 days agogh-148735: Fix a UAF in `Element.findtext()` (#148738)
Stan Ulbrych [Thu, 23 Apr 2026 14:48:00 +0000 (15:48 +0100)] 
gh-148735: Fix a UAF in `Element.findtext()` (#148738)

5 days agogh-148680: Replace internal names with type_reprs of objects in string representation...
David Ellis [Thu, 23 Apr 2026 13:22:20 +0000 (14:22 +0100)] 
gh-148680: Replace internal names with type_reprs of objects in string representations of ForwardRef (#148682)

Co-authored-by: Shamil <ashm.tech@proton.me>
5 days agoGH-126910: Build/link the JIT shim in the Python interpreter (#148872)
Diego Russo [Thu, 23 Apr 2026 11:23:18 +0000 (12:23 +0100)] 
GH-126910: Build/link the JIT shim in the Python interpreter (#148872)

5 days agogh-148907: fix performance regression in `PyType_GetModuleByDef` on free-threading...
Kumar Aditya [Thu, 23 Apr 2026 11:12:57 +0000 (16:42 +0530)] 
gh-148907: fix performance regression in `PyType_GetModuleByDef` on free-threading (#148908)

5 days agogh-146636: Improve ABI/feature selection, add new header for it (GH-148302)
Petr Viktorin [Thu, 23 Apr 2026 09:52:13 +0000 (11:52 +0200)] 
gh-146636: Improve ABI/feature selection, add new header for it (GH-148302)

Improve ABI/feature selection, add new header for it.

Add a test that Python headers themselves don't use
Py_GIL_DISABLED in abi3t: abi3 and abi3t ought to be the
same except the _Py_OPAQUE_PYOBJECT differences.
This is done using the GCC-only poison pragma.

Co-authored-by: Victor Stinner <vstinner@python.org>
5 days agogh-148892: Drop mention of deprecated cibuildwheel option (#148893)
Nathan Goldbaum [Thu, 23 Apr 2026 04:00:35 +0000 (22:00 -0600)] 
gh-148892: Drop mention of deprecated cibuildwheel option (#148893)

5 days agoSpeed up counting in statistics.fmean() (gh-148875)
Raymond Hettinger [Thu, 23 Apr 2026 03:06:56 +0000 (22:06 -0500)] 
Speed up counting in statistics.fmean() (gh-148875)

5 days agogh-119180: Document the `format` parameter in `typing.get_type_hints()` (#143758)
Victorien [Thu, 23 Apr 2026 02:50:15 +0000 (04:50 +0200)] 
gh-119180: Document the `format` parameter in `typing.get_type_hints()` (#143758)

Do not mention `__annotations__` dictionaries, as this is slightly
outdated since 3.14.

Rewrite the note about possible exceptions for clarity. Also do not
mention imported type aliases, as since 3.12 aliases with the `type`
statement do not suffer from this limitation anymore.

5 days agogh-142965: Fix Concatenate documentation to reflect valid use cases (#143316)
John Seong [Thu, 23 Apr 2026 02:46:04 +0000 (10:46 +0800)] 
gh-142965: Fix Concatenate documentation to reflect valid use cases (#143316)

The documentation previously stated that Concatenate is only valid
when used as the first argument to Callable, but according to PEP 612,
it can also be used when instantiating user-defined generic classes
with ParamSpec parameters.

5 days agogh-145194: Fix typing in re tokenizer example (#145198)
Vikash Kumar [Thu, 23 Apr 2026 02:40:10 +0000 (08:10 +0530)] 
gh-145194: Fix typing in re tokenizer example (#145198)

5 days agogh-145056: Add support for frozendict in dataclass asdict and astuple (#145125)
Pieter Eendebak [Thu, 23 Apr 2026 02:39:08 +0000 (04:39 +0200)] 
gh-145056: Add support for frozendict in dataclass asdict and astuple (#145125)

5 days agogh-146553: Fix infinite loop in typing.get_type_hints() on circular __wrapped__ ...
Shamil [Thu, 23 Apr 2026 02:31:58 +0000 (05:31 +0300)] 
gh-146553: Fix infinite loop in typing.get_type_hints() on circular __wrapped__ (#148595)

5 days agogh-148883: Docs: clarify grammar in Counter dictionary methods note (gh-148882)
Sanjay Janardhan [Wed, 22 Apr 2026 22:56:14 +0000 (15:56 -0700)] 
gh-148883: Docs: clarify grammar in Counter dictionary methods note (gh-148882)

5 days agogh-90309: Base64-encode cookie values embedded in JS
Seth Larson [Wed, 22 Apr 2026 19:22:31 +0000 (14:22 -0500)] 
gh-90309: Base64-encode cookie values embedded in JS

5 days agogh-148820: Fix _PyRawMutex use-after-free on spurious semaphore wakeup (gh-148852)
Sam Gross [Wed, 22 Apr 2026 18:31:19 +0000 (14:31 -0400)] 
gh-148820: Fix _PyRawMutex use-after-free on spurious semaphore wakeup (gh-148852)

_PyRawMutex_UnlockSlow CAS-removes the waiter from the list and then
calls _PySemaphore_Wakeup, with no handshake. If _PySemaphore_Wait
returns Py_PARK_INTR, the waiter can destroy its stack-allocated
semaphore before the unlocker's Wakeup runs, causing a fatal error from
ReleaseSemaphore / sem_post.

Loop in _PyRawMutex_LockSlow until _PySemaphore_Wait returns Py_PARK_OK,
which is only signalled when a matching Wakeup has been observed.

Also include GetLastError() and the handle in the Windows fatal messages
in _PySemaphore_Init, _PySemaphore_Wait, and _PySemaphore_Wakeup to make
similar races easier to diagnose in the future.

5 days agogh-148858: Remove duplicated recipe.yaml files in Tools/pixi-packages (#148859)
Isuru Fernando [Wed, 22 Apr 2026 17:50:30 +0000 (10:50 -0700)] 
gh-148858: Remove duplicated recipe.yaml files in Tools/pixi-packages (#148859)

6 days agoAdditional itertool recipes for running statistics (gh-148879)
Raymond Hettinger [Wed, 22 Apr 2026 16:52:41 +0000 (11:52 -0500)] 
Additional itertool recipes for running statistics (gh-148879)

6 days agogh-148207: add additional keywords to `typing.TypeVarTuple` (#148212)
KotlinIsland [Wed, 22 Apr 2026 13:28:12 +0000 (23:28 +1000)] 
gh-148207: add additional keywords to `typing.TypeVarTuple` (#148212)

6 days agoGH-146073: Add example script for dumping JIT traces (GH-148840)
Mark Shannon [Wed, 22 Apr 2026 10:09:05 +0000 (11:09 +0100)] 
GH-146073: Add example script for dumping JIT traces (GH-148840)

6 days agogh-142186: Allow all PEP-669 events to be per-code object and disableable (GH-146182)
Gabriele N. Tornetta [Wed, 22 Apr 2026 08:08:23 +0000 (09:08 +0100)] 
gh-142186: Allow all PEP-669 events to be per-code object and disableable  (GH-146182)

* Make the `PY_UNWIND` monitoring event available as a code-local
event to allow trapping on function exit events when an exception
bubbles up. This complements the PY_RETURN event by allowing to
catch any function exit event.

* Allow `PY_UNWIND`  to be `DISABLE`d; disabling it disables the event for the whole code object.

* Do the above for `PY_THROW`, `RAISE`, `EXCEPTION_HANDLED`, and `RERAISE` events.

6 days agogh-146578: _zstd: Fix printf format for pledged size errors (#146576)
cui [Tue, 21 Apr 2026 19:49:44 +0000 (03:49 +0800)] 
gh-146578: _zstd: Fix printf format for pledged size errors (#146576)

Use %llu instead of %ull for unsigned long long in zstd_contentsize_converter ValueError messages.

6 days ago[Enum] Improve clarity of comparison sentence (GH-148753)
Rida Zouga [Tue, 21 Apr 2026 17:17:02 +0000 (18:17 +0100)] 
[Enum] Improve clarity of comparison sentence (GH-148753)

Co-authored-by: Ethan Furman <ethan@stoneleaf.us>
7 days agogh-148801: Fix unbound C recursion in `Element.__deepcopy__()` (#148802)
Stan Ulbrych [Tue, 21 Apr 2026 16:20:18 +0000 (17:20 +0100)] 
gh-148801: Fix unbound C recursion in `Element.__deepcopy__()` (#148802)

7 days agogh-148808: Add boundary check to asyncio.AbstractEventLoop.sock_recvf… (#148809)
Seth Larson [Tue, 21 Apr 2026 14:29:07 +0000 (09:29 -0500)] 
gh-148808: Add boundary check to asyncio.AbstractEventLoop.sock_recvf… (#148809)

7 days agogh-148814: Fix an issue in Emscripten README (#148752)
Stan Ulbrych [Mon, 20 Apr 2026 23:04:50 +0000 (00:04 +0100)] 
gh-148814: Fix an issue in Emscripten README (#148752)

Correct the description of the default state of test module compilation.

7 days agogh-108411: Make typing.IO/BinaryIO arguments positional-only (#142906)
Roman Donchenko [Mon, 20 Apr 2026 20:19:43 +0000 (23:19 +0300)] 
gh-108411: Make typing.IO/BinaryIO arguments positional-only (#142906)

`IO` is purported to be the type of the file objects returned by `open`.
However, all methods on those objects take positional-only arguments, while
`IO`'s methods are declared with regular arguments. As such, the file objects
cannot actually be considered to implement `IO`. The same thing applies to
`BinaryIO`.

Fix this by adjusting the definition of these ABCs to match the file objects.

This is technically a breaking change, but it is unlikely to actually break
anything:

* These methods should never be called at runtime, since they are abstract.
  Therefore, this should not cause any runtime errors.

* In typeshed these arguments are already positional-only, so this should
  not cause any errors during typechecking either.

7 days agoFix typos in asyncio, ctypes, and importlib documentation (#148747)
ByteFlow [Mon, 20 Apr 2026 19:22:37 +0000 (03:22 +0800)] 
Fix typos in asyncio, ctypes, and importlib documentation (#148747)

8 days agogh-138451: Support custom LLVM installation path (#138452)
Uwe L. Korn [Mon, 20 Apr 2026 16:45:53 +0000 (18:45 +0200)] 
gh-138451: Support custom LLVM installation path (#138452)

Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
Co-authored-by: Steve Dower <steve.dower@microsoft.com>
Co-authored-by: Savannah Ostrowski <savannah@python.org>
8 days agoUse `soft-deprecated` in more places (#148769)
Stan Ulbrych [Mon, 20 Apr 2026 16:00:35 +0000 (17:00 +0100)] 
Use `soft-deprecated` in more places (#148769)

8 days agoDocs: Fix some typos in `calendar.rst` (GH-148756)
Manoj K M [Mon, 20 Apr 2026 14:37:12 +0000 (20:07 +0530)] 
Docs: Fix some typos in `calendar.rst` (GH-148756)

8 days agogh-148644: Propagate the PGO job exit code in PCbuild/build.bat (GH-148645)
Régis Desgroppes [Mon, 20 Apr 2026 14:18:10 +0000 (16:18 +0200)] 
gh-148644: Propagate the PGO job exit code in PCbuild/build.bat (GH-148645)

8 days agogh-148790: Eliminate redundant call to `_PyRuntime_Initialize` in `Py_InitializeEx...
AraHaan [Mon, 20 Apr 2026 14:01:06 +0000 (10:01 -0400)] 
gh-148790: Eliminate redundant call to `_PyRuntime_Initialize` in `Py_InitializeEx` (GH-121628)

8 days agoGH-145278: also filter mmap2 in strace_helper.filter_memory (GH-148648)
Filipe Laíns [Mon, 20 Apr 2026 13:41:10 +0000 (14:41 +0100)] 
GH-145278: also filter mmap2 in strace_helper.filter_memory (GH-148648)

Signed-off-by: Filipe Laíns <lains@riseup.net>
8 days agogh-148718: Fix Py_STACKREF_DEBUG build by defining macros (#148719)
Donghee Na [Mon, 20 Apr 2026 12:55:03 +0000 (21:55 +0900)] 
gh-148718: Fix Py_STACKREF_DEBUG build by defining macros (#148719)

8 days agogh-123853: Update locale.windows_locale (GH-123901)
Serhiy Storchaka [Mon, 20 Apr 2026 08:47:37 +0000 (11:47 +0300)] 
gh-123853: Update locale.windows_locale (GH-123901)

Update the table of Windows language code identifiers (LCIDs) to
protocol version 16.0 (2024-04-23).

8 days agogh-148788: Update Emscripten example post move to Platforms dir (#148761)
Stan Ulbrych [Mon, 20 Apr 2026 02:17:50 +0000 (03:17 +0100)] 
gh-148788: Update Emscripten example post move to Platforms dir (#148761)

Update Emscripten example post move to Platforms dir.

8 days agogh-148763: Fix paramter name in `multiprocessing.connection.send_bytes/recv_bytes_int...
Matthew Davis [Mon, 20 Apr 2026 00:05:50 +0000 (02:05 +0200)] 
gh-148763: Fix paramter name in `multiprocessing.connection.send_bytes/recv_bytes_into` docs (GH-126603)

Doc: Fix buf argument name in multiprocessing connection send_bytes

8 days agogh-148779: Update Briefcase link in android.rst documentation (#148777)
partev [Sun, 19 Apr 2026 21:44:08 +0000 (17:44 -0400)] 
gh-148779: Update Briefcase link in android.rst documentation (#148777)

Use canonical beeware.org URL for link to Briefcase.

8 days agogh-133879: Copyedit "What's new in Python 3.15" (#148686)
Hugo van Kemenade [Sun, 19 Apr 2026 18:42:23 +0000 (21:42 +0300)] 
gh-133879: Copyedit "What's new in Python 3.15" (#148686)

9 days agogh-121946: Use clang-20 for TSan build (#148570)
Sam Gross [Sun, 19 Apr 2026 12:13:47 +0000 (08:13 -0400)] 
gh-121946: Use clang-20 for TSan build (#148570)

9 days agoPrevent GitHub's web conflict editor from converting LF to CRLF (#148739)
Hugo van Kemenade [Sun, 19 Apr 2026 09:21:17 +0000 (12:21 +0300)] 
Prevent GitHub's web conflict editor from converting LF to CRLF (#148739)

9 days agogh-148406: Fix annotations of _colorize.FancyCompleter (#148408)
Daniel Hollas [Sat, 18 Apr 2026 18:51:58 +0000 (19:51 +0100)] 
gh-148406: Fix annotations of _colorize.FancyCompleter (#148408)

Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
9 days agogh-133403: Add type annotations to generate_levenshtein_examples.py (#143317)
John Seong [Sat, 18 Apr 2026 18:50:17 +0000 (02:50 +0800)] 
gh-133403: Add type annotations to generate_levenshtein_examples.py (#143317)

Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
9 days agogh-148659: Export a few more functions required for external JITs (#148704)
Dino Viehland [Sat, 18 Apr 2026 18:32:22 +0000 (11:32 -0700)] 
gh-148659: Export a few more functions required for external JITs (#148704)

Export a few more functions required for external JITs

10 days agogh-148653: Fix reference leaks in test_marshal introduced in gh-148698 (GH-148725)
Serhiy Storchaka [Sat, 18 Apr 2026 12:11:14 +0000 (15:11 +0300)] 
gh-148653: Fix reference leaks in test_marshal introduced in gh-148698 (GH-148725)

10 days agogh-148688: Fix _BlocksOutputBuffer_Finish() double free (#148689)
Victor Stinner [Sat, 18 Apr 2026 09:56:56 +0000 (11:56 +0200)] 
gh-148688: Fix _BlocksOutputBuffer_Finish() double free (#148689)

If _BlocksOutputBuffer_Finish() fails (memory allocation failure),
PyBytesWriter_Discard() is called on the writer. Then if
_BlocksOutputBuffer_OnError() is called, it calls again
PyBytesWriter_Discard() causing a double free.

Fix _BlocksOutputBuffer_Finish() by setting buffer->writer to NULL,
so _BlocksOutputBuffer_OnError() does nothing instead of calling
PyBytesWriter_Discard() again.

10 days agoAdd a new Sphinx `soft-deprecated` directive (#148630)
Hugo van Kemenade [Sat, 18 Apr 2026 08:37:54 +0000 (11:37 +0300)] 
Add a new Sphinx `soft-deprecated` directive (#148630)

Co-authored-by: Stan Ulbrych <stan@python.org>
10 days agogh-148653: Fix some marshal errors related to recursive immutable objects (GH-148698)
Serhiy Storchaka [Sat, 18 Apr 2026 08:24:33 +0000 (11:24 +0300)] 
gh-148653: Fix some marshal errors related to recursive immutable objects (GH-148698)

Forbid marshalling recursive code, slice and frozendict objects which
cannot be correctly unmarshalled.
Reject invalid marshal data produced by marshalling recursive frozendict
objects which was previously incorrectly unmarshalled.
Add multiple tests for recursive data structures.

10 days agogh-148639: Implement PEP 800 (typing.disjoint_base) (#148640)
Jelle Zijlstra [Sat, 18 Apr 2026 02:20:41 +0000 (19:20 -0700)] 
gh-148639: Implement PEP 800 (typing.disjoint_base) (#148640)

Co-authored-by: Victorien <65306057+Viicos@users.noreply.github.com>
Co-authored-by: Petr Viktorin <encukou@gmail.com>
10 days agogh-148222: Fix NULL dereference bugs in genericaliasobject.c (#148226)
Prakash Sellathurai [Sat, 18 Apr 2026 00:21:13 +0000 (05:51 +0530)] 
gh-148222: Fix NULL dereference bugs in genericaliasobject.c (#148226)

11 days agogh-146393: Remove special character in optimizer_bytecodes.c (#148693)
Pieter Eendebak [Fri, 17 Apr 2026 16:52:16 +0000 (18:52 +0200)] 
gh-146393: Remove special character in optimizer_bytecodes.c (#148693)

11 days agogh-148651: Fix refcount leak in _zstd decompressor options (#148657)
Michael Bommarito [Fri, 17 Apr 2026 15:42:41 +0000 (11:42 -0400)] 
gh-148651: Fix refcount leak in _zstd decompressor options (#148657)

The option parsing in Modules/_zstd/decompressor.c had a missing Py_DECREF(value) before the early return -1 when PyLong_AsInt(key) fails. The identical code in Modules/_zstd/compressor.c line 158 has the fix.

11 days agogh-148683: Doc: fix misplaced pprint entries in What's New 3.15 (#148685)
Xuwz [Fri, 17 Apr 2026 14:13:41 +0000 (22:13 +0800)] 
gh-148683: Doc: fix misplaced pprint entries in What's New 3.15 (#148685)

Doc: fix misplaced pprint entries in What's New 3.15

11 days agogh-148484: Fix memory leak of iterator in array.array constructor (GH-148523)
Gleb Popov [Fri, 17 Apr 2026 12:13:44 +0000 (15:13 +0300)] 
gh-148484: Fix memory leak of iterator in array.array constructor (GH-148523)

11 days agogh-148464: Add missing ``__ctype_le/be__`` attributes for complex types in the ctype...
Sergey B Kirpichev [Fri, 17 Apr 2026 12:09:09 +0000 (15:09 +0300)] 
gh-148464: Add missing ``__ctype_le/be__`` attributes for complex types in the ctype module (GH-148485)

Co-authored-by: sunmy2019 <59365878+sunmy2019@users.noreply.github.com>
11 days agogh-148659: Export some internal functions for the JIT (PEP-523) (#148634)
Dino Viehland [Thu, 16 Apr 2026 23:55:03 +0000 (16:55 -0700)] 
gh-148659: Export some internal functions for the JIT (PEP-523) (#148634)

Export (as internal functions, not public ones) C API functions necessary to implement a JIT as a separate extension module.

11 days agogh-148535: Don't use gcc -fprofile-update=atomic flag on i686 (#148554)
Victor Stinner [Thu, 16 Apr 2026 17:13:25 +0000 (19:13 +0200)] 
gh-148535: Don't use gcc -fprofile-update=atomic flag on i686 (#148554)

The -fprofile-update=atomic flag was added to fix a random GCC
internal error on PGO build (gh-145801) caused by corruption of
profile data (.gcda files). The problem is that it makes the PGO
build way slower (up to 47x slower) on i686. Since the GCC internal
error was not seen on i686 so far, don't use -fprofile-update=atomic
on i686.

12 days agogh-146031: Allow keeping specialization enabled when specifying eval frame function...
Dino Viehland [Thu, 16 Apr 2026 16:44:26 +0000 (09:44 -0700)] 
gh-146031: Allow keeping specialization enabled when specifying eval frame function (#146032)

Allow keeping specialization enabled when specifying eval frame function

12 days agoGH-146128: Fix AArch64 multi-instruction constants and relocations (GH-148598)
Mark Shannon [Thu, 16 Apr 2026 14:33:09 +0000 (15:33 +0100)] 
GH-146128: Fix AArch64 multi-instruction constants and relocations (GH-148598)

Fix AArch64 multi-instruction constants and relocations

* Elimates rendundant orr xN, xN, 0xffff after 16 or 32 bit loads
* Merges adrp (21rx) and ldr (12) relocations into single 33rx relocation, when safe to do so.

12 days agoGH-145668: Add FOR_ITER specialization for virtual iterators. Specialize GET_ITER...
Mark Shannon [Thu, 16 Apr 2026 14:22:22 +0000 (15:22 +0100)] 
GH-145668: Add FOR_ITER specialization for virtual iterators. Specialize GET_ITER. (GH-147967)

* Add FOR_ITER_VIRTUAL to specialize FOR_ITER for virtual iterators
* Add GET_ITER_SELF to specialize GET_ITER for iterators (including generators)
* Add GET_ITER_VIRTUAL to specialize GET_ITER for iterables as virtual iterators
* Add new (internal) _tp_iteritem function slot to PyTypeObject
* Put limited RESUME at start of genexpr for free-threading. Fix up exception handling in genexpr

12 days agogh-146636: PEP 803: Reference documentation (GH-148013)
Petr Viktorin [Thu, 16 Apr 2026 12:17:44 +0000 (14:17 +0200)] 
gh-146636: PEP 803: Reference documentation (GH-148013)

Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
12 days agogh-100239: Specialize more binary operations using BINARY_OP_EXTEND (GH-128956)
Pieter Eendebak [Thu, 16 Apr 2026 08:22:41 +0000 (10:22 +0200)] 
gh-100239: Specialize more binary operations using BINARY_OP_EXTEND (GH-128956)

12 days agoDocs: Fix typos and a comment in enum.rst (#148156)
Havmaagen [Thu, 16 Apr 2026 05:53:29 +0000 (07:53 +0200)] 
Docs: Fix typos and a comment in enum.rst (#148156)

12 days agogh-148474: Fix `_Py_hexlify_simd` compilation with older clang (#148475)
Joshua Root [Thu, 16 Apr 2026 05:51:23 +0000 (15:51 +1000)] 
gh-148474: Fix `_Py_hexlify_simd` compilation with older clang (#148475)

12 days agogh-137814: Fix `__qualname__` of `__annotate__` (#137842)
Jelle Zijlstra [Thu, 16 Apr 2026 04:52:30 +0000 (21:52 -0700)] 
gh-137814: Fix `__qualname__` of `__annotate__` (#137842)

12 days agoAdd PyManager documentation for index signatures (GH-148631)
Steve Dower [Wed, 15 Apr 2026 21:48:14 +0000 (22:48 +0100)] 
Add PyManager documentation for index signatures (GH-148631)

12 days agogh-148100: Soft deprecate `re.match` and `re.Pattern.match` in favour of `prefixmatch...
Hugo van Kemenade [Wed, 15 Apr 2026 20:09:47 +0000 (23:09 +0300)] 
gh-148100: Soft deprecate `re.match` and `re.Pattern.match` in favour of `prefixmatch` (#148101)

12 days agogh-148604: change `ADD_OP(_POP_TOP, ...)` to `optimize_pop_top` in `optimizer_bytecod...
Neko Asakura [Wed, 15 Apr 2026 17:08:29 +0000 (13:08 -0400)] 
gh-148604: change `ADD_OP(_POP_TOP, ...)` to `optimize_pop_top` in `optimizer_bytecodes.c` (GH-148619)

13 days agoDocs: Use bash lexer for http.server CLI commands, not Python (#148612)
Hugo van Kemenade [Wed, 15 Apr 2026 15:18:49 +0000 (18:18 +0300)] 
Docs: Use bash lexer for http.server CLI commands, not Python (#148612)

13 days agogh-148600: Add Modules/_ssl_data_40.h data (#148601)
Victor Stinner [Wed, 15 Apr 2026 13:59:02 +0000 (15:59 +0200)] 
gh-148600: Add Modules/_ssl_data_40.h data (#148601)

The Modules/_ssl_data_40.h file was created with the commands:

python Tools/ssl/multissltests.py --steps=library --base-directory "$PWD/multissl" --openssl '4.0.0' --system Linux
python Tools/ssl/make_ssl_data.py multissl/src/openssl-4.0.0 Modules/_ssl_data_40.h

Update Modules/_ssl.c to include it on OpenSSL 4.0.0 and newer.

Update test_ssl for the new error message.

13 days agogh-143886: Ensure function annotations are returned in order of definition (#143888)
Carey Metcalfe [Wed, 15 Apr 2026 13:24:28 +0000 (09:24 -0400)] 
gh-143886: Ensure function annotations are returned in order of definition (#143888)

Ensure function annotations are returned in order of definition

Previously, when getting type annotations of a function, normal
arguments were returned before positional-only ones in the dictionary.
Since `functools.singledispatch` relies on this ordering being correct
to dispatch based on the type of the first argument, this issue was
causing incorrect registrations for functions with positional-only
arguments.

This commit updates how annotations are generated so that
positional-only arguments are generated and added to the dictionary
before normal arguments.

13 days agogh-148609: Remove unicode character in bytecodes.c (GH-148611)
Ken Jin [Wed, 15 Apr 2026 12:58:35 +0000 (20:58 +0800)] 
gh-148609: Remove unicode character in bytecodes.c (GH-148611)

Remove unicode character in bytecodes.c

13 days agogh-131798: Fix `_ITER_CHECK_RANGE` type in the JIT (#148607)
Wulian233 [Wed, 15 Apr 2026 12:22:55 +0000 (20:22 +0800)] 
gh-131798: Fix `_ITER_CHECK_RANGE`  type in the JIT (#148607)

13 days agogh-117716: Fix wave RIFF padding for data chunks (GH-145237)
Michiel W. Beijen [Wed, 15 Apr 2026 12:21:43 +0000 (14:21 +0200)] 
gh-117716: Fix wave RIFF padding for data chunks (GH-145237)

wave.Wave_write now writes the required RIFF pad byte when the data chunk
size is odd.

Update RIFF chunk size calculations in both header writing and header
patching so they include the alignment pad byte when present.

Add a regression test in test_wave.py that verifies
odd-sized writes are padded, RIFF size is correct, and roundtrip reads
preserve frame data.

13 days agogh-148390: fix undefined behavior of `memoryview(...).cast("?")` (#148454)
Bénédikt Tran [Wed, 15 Apr 2026 11:42:20 +0000 (13:42 +0200)] 
gh-148390: fix undefined behavior of `memoryview(...).cast("?")` (#148454)

13 days agogh-139038: Add whatsnew entry for jit unique reference tracking (GH-148572)
Pieter Eendebak [Wed, 15 Apr 2026 10:53:47 +0000 (12:53 +0200)] 
gh-139038: Add whatsnew entry for jit unique reference tracking (GH-148572)

Co-authored-by: Ken Jin <kenjin4096@gmail.com>
13 days agogh-147957: pop items from UserDict in LIFO order (gh-147958)
Anerdw [Wed, 15 Apr 2026 04:29:41 +0000 (23:29 -0500)] 
gh-147957: pop items from UserDict in LIFO order (gh-147958)

13 days agoGH-70647: Remove support for `%d` (and deprecate for `%e`) without year in `strptime...
Stan Ulbrych [Wed, 15 Apr 2026 00:15:27 +0000 (01:15 +0100)] 
GH-70647: Remove support for `%d` (and deprecate for `%e`) without year in `strptime()` (GH-144570)

* Add deprecation for %e with no year
* schedule `%e` for 3.17, and remove `%d` now

13 days agogh-148186: Improve `assertCountEqual` description in docs. (#148463)
Kliment Lamonov [Tue, 14 Apr 2026 23:39:16 +0000 (02:39 +0300)] 
gh-148186: Improve `assertCountEqual` description in docs. (#148463)

13 days agogh-137335: remove a mktemp use in multiprocessing.connection to avoid security scanne...
Gregory P. Smith [Tue, 14 Apr 2026 23:31:58 +0000 (16:31 -0700)] 
gh-137335: remove a mktemp use in multiprocessing.connection to avoid security scanner noise (GH-148578)

remove a mktemp use to avoid security scanner noise

13 days agotiny edit, fix a couple of minor typos in enum and sqlite3 docs (GH-148580)
Gregory P. Smith [Tue, 14 Apr 2026 23:29:35 +0000 (16:29 -0700)] 
tiny edit, fix a couple of minor typos in enum and sqlite3 docs (GH-148580)

pair of minor doc typo fixes

13 days agogh-146393: Use recorded type instead of instance in BINARY_OP (#148569)
Pieter Eendebak [Tue, 14 Apr 2026 20:11:42 +0000 (22:11 +0200)] 
gh-146393: Use recorded type instead of instance in BINARY_OP (#148569)

13 days agoGH-145278: freeze encodings (partially) and linecache (#148347)
Filipe Laíns [Tue, 14 Apr 2026 20:01:23 +0000 (21:01 +0100)] 
GH-145278: freeze encodings (partially) and linecache (#148347)

13 days agogh-146393: Optimize float division operations by mutating uniquely-referenced operand...
Pieter Eendebak [Tue, 14 Apr 2026 18:08:04 +0000 (20:08 +0200)] 
gh-146393: Optimize float division operations by mutating uniquely-referenced operands in place (JIT only) (GH-146397)

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
13 days agogh-86519: Update docs for `prefixmatch` (#148096)
Hugo van Kemenade [Tue, 14 Apr 2026 17:15:06 +0000 (20:15 +0300)] 
gh-86519: Update docs for `prefixmatch` (#148096)

Co-authored-by: Shantanu <12621235+hauntsaninja@users.noreply.github.com>
13 days agogh-146563: add exception note for invalid Expat handler return values (#146565)
Bénédikt Tran [Tue, 14 Apr 2026 17:12:47 +0000 (19:12 +0200)] 
gh-146563: add exception note for invalid Expat handler return values (#146565)

2 weeks agogh-72406: Document argument ordering in argparse help output (#148534)
Santi Hernandez [Tue, 14 Apr 2026 16:24:16 +0000 (10:24 -0600)] 
gh-72406: Document argument ordering in argparse help output (#148534)

Co-authored-by: Savannah Ostrowski <savannah@python.org>
2 weeks agogh-131798: constant fold special method lookups in JIT (#148432)
Kumar Aditya [Tue, 14 Apr 2026 16:02:23 +0000 (21:32 +0530)] 
gh-131798: constant fold special method lookups in JIT (#148432)

2 weeks agogh-148047: Revert "GH-148047: Check early whether tail-calling is possible for MSVC...
Ken Jin [Tue, 14 Apr 2026 15:46:54 +0000 (23:46 +0800)] 
gh-148047: Revert "GH-148047: Check early whether tail-calling is possible for MSVC builds on Windows (#148036)" (#148558)

This reverts commit cbd81d59cfea4f7b881642e804646da3a328a712.

2 weeks agogh-gh-131798: optimize `LOAD_ATTR_GETATTRIBUTE_OVERRIDDEN` in the JIT (#148555)
Kumar Aditya [Tue, 14 Apr 2026 15:30:32 +0000 (21:00 +0530)] 
gh-gh-131798: optimize `LOAD_ATTR_GETATTRIBUTE_OVERRIDDEN` in the JIT (#148555)

2 weeks agogh-133312: configure: add --enable-static-libpython-for-interpreter (#133313)
Geoffrey Thomas [Tue, 14 Apr 2026 15:26:19 +0000 (11:26 -0400)] 
gh-133312: configure: add --enable-static-libpython-for-interpreter (#133313)

This option changes the behavior of --enable-shared to continue to build
the libpython3.x.so shared library, but not use it for linking the
python3 interpreter executable. Instead, the executable is linked
directly against the libpython .o files as it would be with
--disable-shared.

There are two benefits of this change. First, libpython uses
thread-local storage, which is noticeably slower when used in a loaded
module instead of in the main program, because the main program can take
advantage of constant offsets from the thread state pointer but loaded
modules have to dynamically call a function __tls_get_addr() to
potentially allocate their thread-local storage area. (There is another
thread-local storage model for dynamic libraries which mitigates most of
this performance hit, but it comes at the cost of preventing
dlopen("libpython3.x.so"), which is a use case we want to preserve.)

Second, this improves the user experience around relocatable Python a
little bit, in that we don't need to use an $ORIGIN-relative path to
locate libpython3.x.so, which has some mild benefits around musl (which
does not support $ORIGIN-relative DT_NEEDED, only $ORIGIN-relative
DT_RPATH/DT_RUNPATH), users who want to make the interpreter setuid or
setcap (which prevents processing $ORIGIN), etc.

2 weeks agogh-131798: Constant-fold `_CONTAINS_OP_DICT` for frozendict (GH-148548)
Wulian233 [Tue, 14 Apr 2026 15:04:28 +0000 (23:04 +0800)] 
gh-131798: Constant-fold `_CONTAINS_OP_DICT` for frozendict (GH-148548)