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Change some implementation details in struct.Struct

3.15new features, bugs and security fixesnew features, bugs and security fixes

Status: Open.

#145850 In python/cpython;

· serhiy-storchaka opened on Mar 12, 2026

_lsprof: Memory leak in clearEntries() context chain not fully freed

extension-modulesC modules in the Modules dirC modules in the Modules dir

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#145846 In python/cpython;

· raminfp opened on Mar 12, 2026

Support WASI SDK 31

buildThe build process and cross-buildThe build process and cross-build

OS-wasi

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#145844 In python/cpython;

· brettcannon opened on Mar 11, 2026

email.quoprimime.decode() leaves stray \r when eol='\r\n'

stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

topic-email

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#145831 In python/cpython;

· stefanzetzsche opened on Mar 11, 2026

email.utils.collapse_rfc2231_value raises AttributeError on non-3-tuples

stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

topic-email

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#145824 In python/cpython;

· stefanzetzsche opened on Mar 11, 2026

optparse Option._check_callback raises TypeError instead of OptionError for tuple callback_kwargs

stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#145821 In python/cpython;

· stefanzetzsche opened on Mar 11, 2026

freeze cannot find Modules/_hacl/libHacl_Hash_*.o

buildThe build process and cross-buildThe build process and cross-build

extension-modulesC modules in the Modules dirC modules in the Modules dir

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#145810 In python/cpython;

· chris21k opened on Mar 11, 2026

Emscripten: Add python Platforms/emscripten run

OS-emscripten

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#145805 In python/cpython;

· hoodmane opened on Mar 11, 2026

Python should be built with "gcc -fprofile-update=atomic" for PGO to fix random GCC crashes

buildThe build process and cross-buildThe build process and cross-build

type-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump

Status: Open.

#145801 In python/cpython;

· vstinner opened on Mar 11, 2026

Allow Clang-19+ for JIT (currently hard requires clang-19)

buildThe build process and cross-buildThe build process and cross-build

pendingThe issue will be closed if no feedback is providedThe issue will be closed if no feedback is provided

topic-JIT

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#145800 In python/cpython;

· timkofu opened on Mar 11, 2026

Use find_char/memchr to improve performance of str.split

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

performancePerformance or resource usagePerformance or resource usage

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#145797 In python/cpython;

· KowalskiThomas opened on Mar 11, 2026

test_pyrepl.test_repl_eio is flaky on some machines

3.13bugs and security fixesbugs and security fixes

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

testsTests in the Lib/test dirTests in the Lib/test dir

topic-replRelated to the interactive shellRelated to the interactive shell

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#145793 In python/cpython;

· cmaloney opened on Mar 11, 2026