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Dataclasses trigger <code>__get__</code> on unused <code>ClassVar</code> values

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

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

topic-dataclasses

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

Status: Open.

#144618 In python/cpython;

· johnslavik opened on Feb 9, 2026

Race condition in Py_FinalizeEx: _PyObject_Dump and "lost sys.stderr" when SIGINT arrives during _PyImport_Cleanup

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

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

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

Status: Open.

#144616 In python/cpython;

· raminfp opened on Feb 9, 2026

Extensions that raise exceptions in their <code>PyInit*</code> cause a crash in subinterpreters

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

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

topic-subinterpreters

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

Status: Open.

#144601 In python/cpython;

· ZeroIntensity opened on Feb 8, 2026

[Windows] Provide ARM64X binaries.

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

OS-windows

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#144598 In python/cpython;

· dongle-the-gadget opened on Feb 8, 2026

Improve _Py_yield to use light weight cpu instruction

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

performancePerformance or resource usagePerformance or resource usage

topic-free-threading

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#144586 In python/cpython;

· corona10 opened on Feb 8, 2026

Remove support for returning non-int's in __int__/__index__()

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)

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#144584 In python/cpython;

· skirpichev opened on Feb 8, 2026

Scalar replacement of BINARY_SLICE

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

topic-JIT

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#144569 In python/cpython;

· Fidget-Spinner opened on Feb 7, 2026

tachyon fails to attach with <code>_ctypes</code> imported

3.14bugs and security fixesbugs and security fixes

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)

OS-mac

topic-profiling

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

Status: Open.

#144563 In python/cpython;

· mstarodub opened on Feb 7, 2026

Implement <code>_from_iterable</code> on <code>builtins.set</code> and<code>builtins.frozenset</code>

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

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

topic-typing

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#144557 In python/cpython;

· randolf-scholz opened on Feb 7, 2026

Refactor tail-call.yml

infraCI, GitHub Actions, buildbots, Dependabot, etc.CI, GitHub Actions, buildbots, Dependabot, etc.

type-refactorCode refactoring (with no changes in behavior)Code refactoring (with no changes in behavior)

Status: Open.

#144552 In python/cpython;

· savannahostrowski opened on Feb 6, 2026

Update OpenSSL (January 2026)

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

infraCI, GitHub Actions, buildbots, Dependabot, etc.CI, GitHub Actions, buildbots, Dependabot, etc.

OS-android

OS-mac

OS-windows

topic-SSL

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#144551 In python/cpython;

· hugovk opened on Feb 6, 2026

Argument Clinic: the Py_buffer converter only accepts None as the default value

topic-argument-clinic

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#144545 In python/cpython;

· serhiy-storchaka opened on Feb 6, 2026