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Some Unicode format specifiers are incorrect

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

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

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

Status: Open.

#146615 In python/cpython;

· sunmy2019 opened on Mar 29, 2026

itertools._grouper.__next__ has the same re-entrant use-after-free that was fixed in groupby.__next__

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

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

Status: Open.

#146613 In python/cpython;

· devdanzin opened on Mar 29, 2026

Add colour to timeit CLI output

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

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#146609 In python/cpython;

· hugovk opened on Mar 29, 2026

Specialize syntax error for assignment expressions in invalid places

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

topic-parser

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#146601 In python/cpython;

· brianschubert opened on Mar 29, 2026

CYGWIN: GCC prints "defined but not used" warnings on mimalloc

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

dependenciesPull requests that update a dependency filePull requests that update a dependency file

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

OS-windows

triagedThe issue has been accepted as valid by a triager.The issue has been accepted as valid by a triager.

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

Status: Open.

#146594 In python/cpython;

· carlo-bramini opened on Mar 29, 2026

Sequence-like subclass __radd__ fallback regression

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

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

release-blocker

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

Status: Open.

#146587 In python/cpython;

· inventshah opened on Mar 29, 2026

Specialize syntax error for non-case statement inside match statement

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

topic-parser

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#146582 In python/cpython;

· brianschubert opened on Mar 28, 2026

shutil.unpack_archive() on Windows writes outside extract_dir for ZIP entries with drive-prefixed names

3.10only security fixesonly security fixes

3.11only security fixesonly security fixes

3.12only security fixesonly security fixes

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

OS-windows

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

type-securityA security issueA security issue

Status: Open.

#146581 In python/cpython;

· PuH4ck3rX opened on Mar 28, 2026

_zstd: Fix printf format for pledged size errors

3.14bugs and security fixesbugs and security fixes

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

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.

#146578 In python/cpython;

· cuiweixie opened on Mar 28, 2026

_zstd: Fix decompression options dict error message

3.14bugs and security fixesbugs and security fixes

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

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.

#146579 In python/cpython;

· cuiweixie opened on Mar 28, 2026

Improve debugging of Expat handlers return value

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

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#146563 In python/cpython;

· picnixz opened on Mar 28, 2026

JIT optimize dict access with consts with known hash

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

performancePerformance or resource usagePerformance or resource usage

topic-JIT

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#146558 In python/cpython;

· kumaraditya303 opened on Mar 28, 2026