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6 hours agogh-147957: pop items from UserDict in LIFO order (gh-147958) main
Anerdw [Wed, 15 Apr 2026 04:29:41 +0000 (23:29 -0500)] 
gh-147957: pop items from UserDict in LIFO order (gh-147958)

10 hours 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

11 hours 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)

11 hours 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

11 hours 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

14 hours 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)

14 hours 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)

16 hours 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>
17 hours 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>
17 hours 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)

18 hours 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>
18 hours 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)

19 hours 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.

19 hours 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)

19 hours 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.

19 hours 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)

20 hours agogh-148510: restore `func_version` check in `_LOAD_ATTR_PROPERTY_FRAME` (GH-148528)
Neko Asakura [Tue, 14 Apr 2026 14:44:39 +0000 (10:44 -0400)] 
gh-148510: restore `func_version` check in `_LOAD_ATTR_PROPERTY_FRAME` (GH-148528)

21 hours agogh-148192: Fix Generator._make_boundary behavior with CRLF line endings. (#148193)
Henry Jones [Tue, 14 Apr 2026 13:10:08 +0000 (01:10 +1200)] 
gh-148192: Fix Generator._make_boundary behavior with CRLF line endings. (#148193)

The Generator._make_boundary regex did not match on boundary phrases correctly when using CRLF line endings due to re.MULTILINE not considering \r\n as a line ending.

23 hours agogh-134551: Add t-strings support to pprint (#134577)
Loïc Simon [Tue, 14 Apr 2026 11:37:41 +0000 (13:37 +0200)] 
gh-134551: Add t-strings support to pprint (#134577)

Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
23 hours agogh-148378: Allow multiple consecutive recording ops per macro op (GH-148496)
Hai Zhu [Tue, 14 Apr 2026 11:26:53 +0000 (19:26 +0800)] 
gh-148378: Allow multiple consecutive recording ops per macro op (GH-148496)

25 hours agogh-143955: Prevent schema drift false-positives in asyncio tools tests (#148525)
Bartosz Sławecki [Tue, 14 Apr 2026 09:29:01 +0000 (11:29 +0200)] 
gh-143955: Prevent schema drift false-positives in asyncio tools tests (#148525)

28 hours agogh-148487: Fix issues in `test_add_python_opts` (#148507)
Stan Ulbrych [Tue, 14 Apr 2026 06:45:26 +0000 (07:45 +0100)] 
gh-148487: Fix issues in `test_add_python_opts` (#148507)

30 hours agogh-148515: make `optimizer_generator` respect multiple caches (#148524)
Neko Asakura [Tue, 14 Apr 2026 04:51:05 +0000 (00:51 -0400)] 
gh-148515: make `optimizer_generator` respect multiple caches (#148524)

31 hours agogh-148508: Add resilience to SSL preauth tests on iOS (#148536)
Russell Keith-Magee [Tue, 14 Apr 2026 03:12:37 +0000 (11:12 +0800)] 
gh-148508: Add resilience to SSL preauth tests on iOS (#148536)

Adds handling for a test case seen in the iOS SSL tests where an SSL connection fails to
handshake correctly.

36 hours agogh-148252: Fix stack depth calculation in binary reader on 32-bit platforms (#148253)
Pablo Galindo Salgado [Mon, 13 Apr 2026 22:43:55 +0000 (23:43 +0100)] 
gh-148252: Fix stack depth calculation in binary reader on 32-bit platforms (#148253)

Compute ``final_depth`` in ``decode_stack_pop_push()`` and
``decode_stack_suffix()`` using ``uint64_t`` before validating it.

On 32-bit builds, using ``size_t`` arithmetic for ``keep + push`` can wrap
for large input values, causing the later bounds check to validate the wrong
final depth. Using a widened type keeps the validation aligned with the
actual result.

36 hours agogh-148370: prevent quadratic behavior in `configparser.ParsingError.combine` (#148452)
Bénédikt Tran [Mon, 13 Apr 2026 22:32:54 +0000 (00:32 +0200)] 
gh-148370: prevent quadratic behavior in `configparser.ParsingError.combine` (#148452)

36 hours agogh-148178: Validate remote debug offset tables on load (#148187)
Pablo Galindo Salgado [Mon, 13 Apr 2026 22:22:23 +0000 (23:22 +0100)] 
gh-148178: Validate remote debug offset tables on load (#148187)

Treat the debug offset tables read from a target process as untrusted input
and validate them before the unwinder uses any reported sizes or offsets.

Add a shared validator in debug_offsets_validation.h and run it once when
_Py_DebugOffsets is loaded and once when AsyncioDebug is loaded. The checks
cover section sizes used for fixed local buffers and every offset that is
later dereferenced against a local buffer or local object view. This keeps
the bounds checks out of the sampling hot path while rejecting malformed
tables up front.

36 hours agogh-144881: Add retry logic to asyncio debugging tools (#148530)
Bartosz Sławecki [Mon, 13 Apr 2026 22:10:54 +0000 (00:10 +0200)] 
gh-144881: Add retry logic to asyncio debugging tools (#148530)

Transient errors can occur when attaching to a process that is actively
using thread delegation (e.g. asyncio.to_thread). Add a retry loop to
_get_awaited_by_tasks for RuntimeError, OSError, UnicodeDecodeError, and
MemoryError, and expose --retries CLI flag on both `ps` and `pstree`
subcommands (default: 3).

Co-authored-by: Pablo Galindo Salgado <Pablogsal@gmail.com>
Co-authored-by: Stan Ulbrych <stan@python.org>
37 hours agogh-146445: Migrate Android build tools to the Platforms folder. (#148282)
Russell Keith-Magee [Mon, 13 Apr 2026 21:41:16 +0000 (05:41 +0800)] 
gh-146445: Migrate Android build tools to the Platforms folder. (#148282)

Migrates Android build tooling to the shared Platforms folder.

Co-authored-by: Malcolm Smith <smith@chaquo.com>
37 hours agogh-146139: Disable `socketpair` authentication on WASI (#146140)
Joel Dice [Mon, 13 Apr 2026 21:06:36 +0000 (15:06 -0600)] 
gh-146139: Disable `socketpair` authentication on WASI (#146140)

Calling `connect(2)` on a non-blocking socket on WASI may leave the socket in a
"connecting" but not yet "connected" state.  In the former case, calling
`getpeername(2)` on it will fail, leading to an unhandled exception in Python.

Co-authored-by: Victor Stinner <vstinner@python.org>
Co-authored-by: Brett Cannon <brett@python.org>
39 hours agogh-148169: Fix webbrowser `%action` substitution bypass of dash-prefix check (#148170)
Stan Ulbrych [Mon, 13 Apr 2026 19:02:52 +0000 (20:02 +0100)] 
gh-148169: Fix webbrowser `%action` substitution bypass of dash-prefix check (#148170)

40 hours agoFix "encodings" typo in argparse.FileType documentation (#148502)
Gleb Popov [Mon, 13 Apr 2026 18:12:25 +0000 (21:12 +0300)] 
Fix "encodings" typo in argparse.FileType documentation (#148502)

40 hours agogh-148393: Use acquire load for _ma_watcher_tag in dict notify event (gh-148509)
Sam Gross [Mon, 13 Apr 2026 18:11:28 +0000 (14:11 -0400)] 
gh-148393: Use acquire load for _ma_watcher_tag in dict notify event (gh-148509)

The watcher-bits read in _PyDict_NotifyEvent needs to use acquire to
synchronize with the release from PyDict_Watch so that the callback
publication is visible before the callback is invoked.

42 hours agoMinor improvement to statistics.pdf() (gh-148500)
Raymond Hettinger [Mon, 13 Apr 2026 16:29:15 +0000 (11:29 -0500)] 
Minor improvement to statistics.pdf() (gh-148500)

44 hours agogh-131798: JIT: Optimize `_CHECK_IS_NOT_PY_CALLABLE_EX` and `_CHECK_IS_NOT_PY_CALLABL...
Wulian233 [Mon, 13 Apr 2026 14:41:06 +0000 (22:41 +0800)] 
gh-131798: JIT: Optimize `_CHECK_IS_NOT_PY_CALLABLE_EX` and `_CHECK_IS_NOT_PY_CALLABLE_KW` (GH-148494)

45 hours agogh-131798: optimize through keyword and bound method calls in the JIT (GH-148466)
Kumar Aditya [Mon, 13 Apr 2026 13:14:48 +0000 (18:44 +0530)] 
gh-131798: optimize through keyword and bound method calls in the JIT (GH-148466)

Co-authored-by: Ken Jin <kenjin4096@gmail.com>
45 hours agogh-148483: Use Py_GCC_ATTRIBUTE(unused) for stop_tracing label (GH-148481)
Charlie Lin [Mon, 13 Apr 2026 13:05:34 +0000 (09:05 -0400)] 
gh-148483: Use Py_GCC_ATTRIBUTE(unused) for stop_tracing label (GH-148481)

46 hours agogh-148285: Allow recording uops after specializing uops (GH-148482)
Neko Asakura [Mon, 13 Apr 2026 12:56:29 +0000 (08:56 -0400)] 
gh-148285: Allow recording uops after specializing uops (GH-148482)

47 hours agogh-96894: Do not turn echo off for subsequent commands in batch activators (GH-96895)
Paweł Szramowski [Mon, 13 Apr 2026 11:50:46 +0000 (13:50 +0200)] 
gh-96894: Do not turn echo off for subsequent commands in batch activators (GH-96895)

2 days agoInternalDocs: Correct struct path for latin1 singletons in `string_interning.md`...
Stan Ulbrych [Mon, 13 Apr 2026 09:45:41 +0000 (10:45 +0100)] 
InternalDocs: Correct struct path for latin1 singletons in `string_interning.md` (GH-148358)

2 days agogh-148395: Fix a possible UAF in `{LZMA,BZ2,_Zlib}Decompressor` (GH-148396)
Stan Ulbrych [Mon, 13 Apr 2026 01:14:54 +0000 (02:14 +0100)] 
gh-148395: Fix a possible UAF in `{LZMA,BZ2,_Zlib}Decompressor` (GH-148396)

Fix dangling input pointer after `MemoryError` in _lzma/_bz2/_ZlibDecompressor.decompress

2 days agogh-121190: Emit a better error message from `importlib.resources.files()` when module...
Jason R. Coombs [Sun, 12 Apr 2026 22:15:01 +0000 (18:15 -0400)] 
gh-121190: Emit a better error message from `importlib.resources.files()` when module spec is `None`" (#148460)

Also merges incidental changes from importlib_resources 7.1.

Co-authored by: Yuichiro Tachibana (Tsuchiya) <t.yic.yt@gmail.com>

2 days agogh-146450: Ensure Android gradle build uses custom cross-build dir (#148319)
Russell Keith-Magee [Sun, 12 Apr 2026 21:57:29 +0000 (05:57 +0800)] 
gh-146450: Ensure Android gradle build uses custom cross-build dir (#148319)

Ensures that the testbed's Gradle configuration uses the cross-build environment
variable, and that variable is passed to Gradle by the cross-build script.

Co-authored-by: Malcolm Smith <smith@chaquo.com>
2 days agogh-105936: Properly update closure cells for `__setattr__` and `__delattr__` in froze...
Sviataslau [Sun, 12 Apr 2026 21:12:19 +0000 (00:12 +0300)] 
gh-105936: Properly update closure cells for `__setattr__` and `__delattr__` in frozen dataclasses with slots (GH-144021)

2 days agogh-148438: implement `_RECORD_BOUND_METHOD` in JIT (GH-148457)
Neko Asakura [Sun, 12 Apr 2026 18:57:55 +0000 (14:57 -0400)] 
gh-148438: implement `_RECORD_BOUND_METHOD` in JIT (GH-148457)

2 days agogh-131798: Split `_CHECK_AND_ALLOCATE_OBJECT` into smaller uops (GH-148433)
Sacul [Sun, 12 Apr 2026 18:31:24 +0000 (02:31 +0800)] 
gh-131798: Split `_CHECK_AND_ALLOCATE_OBJECT` into smaller uops (GH-148433)

Co-authored-by: Hai Zhu <haiizhu@outlook.com>
Co-authored-by: Ken Jin <kenjin4096@gmail.com>
2 days agogh-146261: JIT: protect against function version changes (#146300)
Ken Jin [Sun, 12 Apr 2026 18:23:47 +0000 (02:23 +0800)] 
gh-146261: JIT: protect against function version changes (#146300)

Co-authored-by: Kumar Aditya <kumaraditya@python.org>
2 days agogh-139551: add support for BaseExceptionGroup in IDLE (GH-139563)
Locked-chess-official [Sun, 12 Apr 2026 17:06:41 +0000 (01:06 +0800)] 
gh-139551: add support for BaseExceptionGroup in IDLE (GH-139563)

Meaningfully render ExceptionGroup tracebacks in the IDLE GUI REPL.

---------

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
Co-authored-by: Gregory P. Smith <greg@krypto.org>
2 days agogh-148393: Use atomic ops on _ma_watcher_tag in free threading build (gh-148397)
Sam Gross [Sun, 12 Apr 2026 14:40:41 +0000 (10:40 -0400)] 
gh-148393: Use atomic ops on _ma_watcher_tag in free threading build (gh-148397)

Fixes data races between dict mutation and watch/unwatch on the same dict.

2 days agogh-131798: Add `_CHECK_IS_NOT_PY_CALLABLE` to the JIT optimizer (GH-148434)
Wulian233 [Sun, 12 Apr 2026 13:07:19 +0000 (21:07 +0800)] 
gh-131798: Add `_CHECK_IS_NOT_PY_CALLABLE` to the JIT optimizer (GH-148434)

2 days agogh-148398: add type watcher in `_CHECK_ATTR_CLASS` (GH-148399)
Neko Asakura [Sun, 12 Apr 2026 12:54:03 +0000 (08:54 -0400)] 
gh-148398: add type watcher in `_CHECK_ATTR_CLASS` (GH-148399)

3 days agogh-146313: Fix multiprocessing ResourceTracker deadlock after os.fork() (GH-146316)
Gregory P. Smith [Sun, 12 Apr 2026 06:06:19 +0000 (23:06 -0700)] 
gh-146313: Fix multiprocessing ResourceTracker deadlock after os.fork() (GH-146316)

`ResourceTracker.__del__` (added in gh-88887 circa Python 3.12) calls
os.waitpid(pid, 0) which blocks indefinitely if a process created via os.fork()
still holds the tracker pipe's write end. The tracker never sees EOF, never
exits, and the parent hangs at interpreter shutdown.

Fix with two layers:

- **At-fork handler.** An os.register_at_fork(after_in_child=...)
  handler closes the inherited pipe fd in the child unless a preserve
  flag is set. popen_fork.Popen._launch() sets the flag before its
  fork so mp.Process(fork) children keep the fd and reuse the parent's
  tracker (preserving gh-80849). Raw os.fork() children close the fd,
  letting the parent reap promptly.

- **Timeout safety-net.** _stop_locked() gains a wait_timeout
  parameter. When called from `__del__`, it polls with WNOHANG using
  exponential backoff for up to 1 second instead of blocking
  indefinitely. The at-fork handler makes this unreachable in
  well-behaved paths; it remains for abnormal shutdowns.

Co-authored-by: Itamar Oren <itamarost@gmail.com>
3 days agoGH-148047: Check early whether tail-calling is possible for MSVC builds on Windows...
Chris Eibl [Sun, 12 Apr 2026 05:49:18 +0000 (07:49 +0200)] 
GH-148047: Check early whether tail-calling is possible for MSVC builds on Windows (#148036)

Rather than failing late when compiling e.g. a debug configuration
```
build.bat -c debug --tail-call-interp
```
with hundreds of
```
error C4737: Unable to perform required tail call. Performance may be degraded.
```
-- fail early with an explicit error message for configurations that are not supported by MSVC.

This is a follow-up on https://github.com/python/cpython/issues/140513 / https://github.com/python/cpython/pull/140548

3 days agogh-89520: Load extension settings and keybindings from user config (GH-28713)
CoolCat467 [Sun, 12 Apr 2026 04:44:33 +0000 (23:44 -0500)] 
gh-89520: Load extension settings and keybindings from user config (GH-28713)

Extension keybindings defined in ~/.idlerc/config-extensions.cfg were silently ignored because GetExtensionKeys, __GetRawExtensionKeys, and GetExtensionBindings only checked default config. Fix these to check user config as well, and update the extensions config dialog to handle user-only extensions correctly.

---------

Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
Co-authored-by: Gregory P. Smith <greg@krypto.org>
3 days agogh-100305: Deemphasize that `ast.literal_eval` is safe in `eval` documentation (...
Ram Vikram Singh [Sun, 12 Apr 2026 03:07:42 +0000 (08:37 +0530)] 
gh-100305: Deemphasize that `ast.literal_eval` is safe in `eval` documentation (#100326)

Co-authored-by: Éric <merwok@netwok.org>
3 days agogh-147965: Add shutdown() to multiprocessing.Queue excluded methods (GH-147970)
WYSIATI [Sun, 12 Apr 2026 00:46:06 +0000 (08:46 +0800)] 
gh-147965: Add shutdown() to multiprocessing.Queue excluded methods (GH-147970)

The multiprocessing.Queue documentation states it implements all
methods of queue.Queue except task_done() and join(). Since
queue.Queue.shutdown() was added in Python 3.13,
multiprocessing.Queue also does not implement it. Update the docs
to include shutdown() in the list of excluded methods.

3 days agogh-97032: avoid test_squeezer crash on macOS buildbots (gh-115508) (GH-148141)
Neil Schemenauer [Sun, 12 Apr 2026 00:43:04 +0000 (17:43 -0700)] 
gh-97032: avoid test_squeezer crash on macOS buildbots (gh-115508) (GH-148141)

gh-97032: avoid test_squeezer crash on macOS buildbots (#115508)

avoid test_squeezer crash on macOS buildbots

Co-authored-by: Ned Deily <nad@python.org>
3 days agogh-148208: Fix recursion depth leak in `PyObject_Print` (GH-148209)
Wulian233 [Sun, 12 Apr 2026 00:26:18 +0000 (08:26 +0800)] 
gh-148208: Fix recursion depth leak in `PyObject_Print` (GH-148209)

3 days agogh-142831: Fix use-after-free in json encoder during re-entrant mutation (gh-142851)
Shamil [Sun, 12 Apr 2026 00:14:50 +0000 (03:14 +0300)] 
gh-142831: Fix use-after-free in json encoder during re-entrant mutation (gh-142851)

Hold strong references to borrowed items unconditionally (not only in
free-threading builds) in _encoder_iterate_mapping_lock_held and
_encoder_iterate_fast_seq_lock_held.  User callbacks invoked during
encoding can mutate or clear the underlying container, invalidating
borrowed references.

The dict iteration path was already fixed by gh-145244.

Co-authored-by: Kumar Aditya <kumaraditya@python.org>
Co-authored-by: Gregory P. Smith <greg@krypto.org>
3 days agogh-146287: Fix signed/unsigned mismatch in _hashlib_hmac_digest_size (GH-148407)
Gregory P. Smith [Sun, 12 Apr 2026 00:02:56 +0000 (17:02 -0700)] 
gh-146287: Fix signed/unsigned mismatch in _hashlib_hmac_digest_size (GH-148407)

* gh-146287: use signed type for HMAC digest size to prevent unsigned wrapping

Change _hashlib_hmac_digest_size() return type from unsigned int to int
so that a hypothetical negative return from EVP_MD_size() is not
silently wrapped to a large positive value. Add an explicit check for
negative digest_size in the legacy OpenSSL path, and use SystemError
(not ValueError) since these conditions indicate internal invariant
violations. Also add debug-build asserts to EVP_get_block_size and
EVP_get_digest_size documenting that the hash context is always
initialized.

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
3 days agotests: use errno.EBADF instead of hardcoded number in _close_file() (GH-148345)
Artem Yarulin [Sun, 12 Apr 2026 00:01:18 +0000 (03:01 +0300)] 
tests: use errno.EBADF instead of hardcoded number in _close_file() (GH-148345)

test_interpreters: use errno.EBADF instead of hardcoded number in _close_file()

Replace the hardcoded `9` check in `Lib/test/test_interpreters/utils.py` with `errno.EBADF`.

Using `errno.EBADF` makes the helper portable across platforms with different errno numbering while preserving the intended behavior.

3 days agogh-145244: Fix use-after-free on borrowed dict key in json encoder (GH-145245)
Ramin Farajpour Cami [Sat, 11 Apr 2026 22:26:36 +0000 (01:56 +0330)] 
gh-145244: Fix use-after-free on borrowed dict key in json encoder (GH-145245)

In encoder_encode_key_value(), key is a borrowed reference from
PyDict_Next(). If the default callback mutates or clears the dict,
key becomes a dangling pointer. The error path then calls
_PyErr_FormatNote("%R", key) on freed memory.

Fix by holding strong references to key and value unconditionally
during encoding, not just in the free-threading build.

Co-authored-by: Peter Bierma <zintensitydev@gmail.com>
3 days agogh-127012: `Traversable.read_text` now allows/solicits an `errors` parameter. (#148401)
Jason R. Coombs [Sat, 11 Apr 2026 22:25:20 +0000 (18:25 -0400)] 
gh-127012: `Traversable.read_text` now allows/solicits an `errors` parameter. (#148401)

Applies changes from importlib_resources 6.5.2.

3 days agogh-145105: Fix crash in csv.reader with re-entrant iterator (GH-145106)
Ramin Farajpour Cami [Sat, 11 Apr 2026 22:18:02 +0000 (01:48 +0330)] 
gh-145105: Fix crash in csv.reader with re-entrant iterator (GH-145106)

When a custom iterator calls next() on the same csv.reader from
within __next__, the inner iteration sets self->fields to NULL.
The outer iteration then crashes in parse_save_field() by passing
NULL to PyList_Append.

Add a guard after PyIter_Next() to detect that fields was set to
NULL by a re-entrant call, and raise csv.Error instead of crashing.

3 days agogh-145200: Fix EVP_MAC_CTX leak in hashlib HMAC on init failure (GH-145201)
Ramin Farajpour Cami [Sat, 11 Apr 2026 22:10:43 +0000 (01:40 +0330)] 
gh-145200: Fix EVP_MAC_CTX leak in hashlib HMAC on init failure (GH-145201)

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
3 days agogh-146302: make Py_IsInitialized() thread-safe and reflect true init completion ...
Gregory P. Smith [Sat, 11 Apr 2026 21:54:23 +0000 (14:54 -0700)] 
gh-146302: make Py_IsInitialized() thread-safe and reflect true init completion (GH-146303)

## Summary

- Move the `runtime->initialized = 1` store from before `site.py` import to the end of `init_interp_main()`, so `Py_IsInitialized()` only returns true after initialization has fully completed
- Access `initialized` and `core_initialized` through new inline accessors using acquire/release atomics, to also protect from data race undefined behavior
- `PySys_AddAuditHook()` now uses the accessor, so with the flag move it correctly skips audit hook invocation during all init phases (matching the documented "after runtime initialization" behavior) ... We could argue that running these earlier would be good even if the intent was never explicitly expressed, but that'd be its own issue.

## Motivation

`Py_IsInitialized()` returned 1 while `Py_InitializeEx()` was still running — specifically, before `site.py` had been imported. See https://github.com/PyO3/pyo3/issues/5900 where a second thread could acquire the GIL and start executing Python with an incomplete `sys.path` because `site.py` hadn't finished.

The flag was also a plain `int` with no atomic operations, making concurrent reads a C-standard data race, though unlikely to manifest.

## Regression test:

The added test properly fails on `main` with `ERROR: Py_IsInitialized() was true during site import`.

---

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
3 days agogh-94523: IDLE: Detect file if modified and prompt the user to refresh (GH-145625)
Shixian Li [Sat, 11 Apr 2026 21:36:59 +0000 (05:36 +0800)] 
gh-94523: IDLE: Detect file if modified and prompt the user to refresh (GH-145625)

3 days agogh-146264: Use static HACL deps for static module builds (GH-146265)
Ihar Hrachyshka [Sat, 11 Apr 2026 21:31:10 +0000 (17:31 -0400)] 
gh-146264: Use static HACL deps for static module builds (GH-146265)

3 days agogh-116738: Align bz2 unused_data getter to lzma implementation (GH-144351)
Alper [Sat, 11 Apr 2026 21:13:51 +0000 (14:13 -0700)] 
gh-116738: Align bz2 unused_data getter to lzma implementation (GH-144351)

Align bz2 unused_data getter to lzma

3 days agogh-137855: Improve import time of dataclasses by lazy importing `re` and `copy`...
Daniel Hollas [Sat, 11 Apr 2026 21:05:24 +0000 (22:05 +0100)] 
gh-137855: Improve import time of dataclasses by lazy importing  `re` and `copy` modules (#148379)

Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
3 days agogh-131798: do not watch immutable types in JIT (#148383)
Kumar Aditya [Sat, 11 Apr 2026 15:43:53 +0000 (21:13 +0530)] 
gh-131798: do not watch immutable types in JIT (#148383)

3 days agoDefault GHA permissions to `contents: read` (#148346)
Hugo van Kemenade [Sat, 11 Apr 2026 15:37:12 +0000 (18:37 +0300)] 
Default GHA permissions to `contents: read` (#148346)

3 days agogh-148320: document that `import sys.monitoring` raises `ModuleNotFoundError` (#148365)
Jonathan Dung [Sat, 11 Apr 2026 15:22:48 +0000 (23:22 +0800)] 
gh-148320: document that `import sys.monitoring` raises `ModuleNotFoundError` (#148365)

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
3 days agogh-148374: Fix a bug in `_Py_uop_sym_get_type` (GH-148375)
Sacul [Sat, 11 Apr 2026 15:03:13 +0000 (23:03 +0800)] 
gh-148374: Fix a bug in `_Py_uop_sym_get_type` (GH-148375)

3 days agogh-131798: Add `_IS_NONE` to the JIT optimizer (GH-148369)
Wulian233 [Sat, 11 Apr 2026 15:02:46 +0000 (23:02 +0800)] 
gh-131798: Add `_IS_NONE` to the JIT optimizer (GH-148369)

3 days agogh-148276: Optimize object creation and method calls in the JIT by resolving __init__...
Pieter Eendebak [Sat, 11 Apr 2026 14:22:42 +0000 (16:22 +0200)] 
gh-148276: Optimize object creation and method calls in the JIT by resolving __init__ at trace optimization time (GH-148277)

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-authored-by: Ken Jin <kenjin4096@gmail.com>
3 days agogh-148171: Convert `CALL_BUILTIN_CLASS` to leave arguments on the stack (gh-148381)
Donghee Na [Sat, 11 Apr 2026 14:01:25 +0000 (23:01 +0900)] 
gh-148171: Convert `CALL_BUILTIN_CLASS` to leave arguments on the stack (gh-148381)

3 days agogh-148211: decompose `_POP_TWO/_POP_CALL(_ONE/_TWO)` in JIT (GH-148377)
Neko Asakura [Sat, 11 Apr 2026 12:46:56 +0000 (08:46 -0400)] 
gh-148211: decompose `_POP_TWO/_POP_CALL(_ONE/_TWO)` in JIT (GH-148377)

4 days agogh-148211: decompose `[_POP_TWO/_INSERT_2]_LOAD_CONST_INLINE_BORROW` in JIT (GH-148357)
Neko Asakura [Sat, 11 Apr 2026 10:27:51 +0000 (06:27 -0400)] 
gh-148211: decompose `[_POP_TWO/_INSERT_2]_LOAD_CONST_INLINE_BORROW` in JIT (GH-148357)

4 days agoFix format string mismatch for `uint64_t` in `_remote_debugging/threads.c` (#148360) 148367/head
Stan Ulbrych [Sat, 11 Apr 2026 08:10:02 +0000 (09:10 +0100)] 
Fix format string mismatch for `uint64_t` in `_remote_debugging/threads.c` (#148360)

4 days agogh-148171: Convert variadic argument opcodes to leave their arguments on the stack...
Sacul [Sat, 11 Apr 2026 05:27:24 +0000 (13:27 +0800)] 
gh-148171: Convert variadic argument opcodes to leave their arguments on the stack (`CALL_BUILTIN_FAST_WITH_KEYWORDS`) (#148366)

4 days agogh-148171: convert more variadic uops to leave input on stack in JIT (#148361)
Kumar Aditya [Sat, 11 Apr 2026 04:59:38 +0000 (10:29 +0530)] 
gh-148171: convert more variadic uops to leave input on stack in JIT (#148361)

4 days agogh-142518: add thread safety docs for set C-APIs (#146562)
Kumar Aditya [Fri, 10 Apr 2026 19:33:24 +0000 (01:03 +0530)] 
gh-142518: add thread safety docs for set C-APIs (#146562)

Co-authored-by: Victor Stinner <vstinner@python.org>
4 days agogh-139038: Credit more people for JIT in 3.15 (GH-148359)
Ken Jin [Fri, 10 Apr 2026 18:59:18 +0000 (02:59 +0800)] 
gh-139038: Credit more people for JIT in 3.15 (GH-148359)

4 days agogh-142518: annotate dict C-APIs for thread safety (#145875)
Lysandros Nikolaou [Fri, 10 Apr 2026 18:41:12 +0000 (20:41 +0200)] 
gh-142518: annotate dict C-APIs for thread safety (#145875)

4 days agogh-131798: split `_CALL_BUILTIN_CLASS` to smaller uops (#148094)
Kumar Aditya [Fri, 10 Apr 2026 17:28:20 +0000 (22:58 +0530)] 
gh-131798: split `_CALL_BUILTIN_CLASS` to smaller uops (#148094)

4 days agogh-148284: Block inlining of gigantic functions in ceval.c for clang 22 (GH-148334)
Ken Jin [Fri, 10 Apr 2026 16:52:23 +0000 (00:52 +0800)] 
gh-148284: Block inlining of gigantic functions in ceval.c for clang 22 (GH-148334)

Co-authored-by: Victor Stinner <vstinner@python.org>
4 days agogh-148337: Document `importlib.resources` security model (#148340)
Stan Ulbrych [Fri, 10 Apr 2026 16:02:22 +0000 (17:02 +0100)] 
gh-148337: Document `importlib.resources` security model (#148340)

4 days agoRemove dead links to `pkg_resources` in `importlib` docs (#148344)
Stan Ulbrych [Fri, 10 Apr 2026 16:02:00 +0000 (17:02 +0100)] 
Remove dead links to `pkg_resources` in `importlib` docs (#148344)

4 days agoFix mixed line endings with pre-commit (#148336)
Hugo van Kemenade [Fri, 10 Apr 2026 15:33:11 +0000 (18:33 +0300)] 
Fix mixed line endings with pre-commit (#148336)

Co-authored-by: Zachary Ware <zachary.ware@gmail.com>
4 days agogh-146211: Reject CR/LF in HTTP tunnel request headers (#146212)
Seth Larson [Fri, 10 Apr 2026 15:21:42 +0000 (10:21 -0500)] 
gh-146211: Reject CR/LF in HTTP tunnel request headers (#146212)

Co-authored-by: Illia Volochii <illia.volochii@gmail.com>
4 days agogh-148171: Convert CALL_BUILTIN_FAST to leave inputs on the stack for refcount elimin...
Ken Jin [Fri, 10 Apr 2026 15:11:18 +0000 (23:11 +0800)] 
gh-148171: Convert CALL_BUILTIN_FAST to leave inputs on the stack for refcount elimination in JIT (GH-148172)

4 days agogh-148211: decompose `[_POP_CALL_X/_SHUFFLE_2]_LOAD_CONST_INLINE_BORROW` in JIT ...
Neko Asakura [Fri, 10 Apr 2026 13:57:01 +0000 (21:57 +0800)] 
gh-148211: decompose `[_POP_CALL_X/_SHUFFLE_2]_LOAD_CONST_INLINE_BORROW` in JIT (GH-148313)

4 days agogh-148037: remove critical section from `PyCode_Addr2Line` (#148103)
Kumar Aditya [Fri, 10 Apr 2026 12:28:17 +0000 (17:58 +0530)] 
gh-148037: remove critical section from `PyCode_Addr2Line` (#148103)

5 days agogh-145831: email.quoprimime: `decode()` leaves stray `\r` when `eol='\r\n'` (#145832)
Stefan Zetzsche [Thu, 9 Apr 2026 20:21:49 +0000 (21:21 +0100)] 
gh-145831: email.quoprimime: `decode()` leaves stray `\r` when `eol='\r\n'` (#145832)

decoded[:-1] only strips one character, leaving a stray \r when eol
is two characters. Fix: decoded[:-len(eol)].

5 days agogh-148211: decompose `_INSERT_1_LOAD_CONST_INLINE(_BORROW)` in JIT (GH-148283)
Neko Asakura [Thu, 9 Apr 2026 16:45:39 +0000 (00:45 +0800)] 
gh-148211: decompose `_INSERT_1_LOAD_CONST_INLINE(_BORROW)` in JIT (GH-148283)

5 days agogh-148254: Use singular "sec" in timeit verbose output (#148290)
gaweng [Thu, 9 Apr 2026 14:37:19 +0000 (16:37 +0200)] 
gh-148254: Use singular "sec" in timeit verbose output (#148290)

5 days agogh-134584 : Optimize and eliminate redundant ref-counting for `MAKE_FUNCTION` in...
Sacul [Thu, 9 Apr 2026 14:22:53 +0000 (22:22 +0800)] 
gh-134584 : Optimize and eliminate redundant ref-counting for  `MAKE_FUNCTION` in the JIT (GH-144963)

5 days agogh-148091: clarify asyncio.Future.cancel(msg) behaviour (#148248)
Manoj K M [Thu, 9 Apr 2026 14:11:31 +0000 (19:41 +0530)] 
gh-148091: clarify asyncio.Future.cancel(msg) behaviour (#148248)

5 days agogh-106318: Add example for str.swapcase() method (#144575)
Adorilson Bezerra [Thu, 9 Apr 2026 13:33:31 +0000 (14:33 +0100)] 
gh-106318: Add example for str.swapcase() method (#144575)