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Python 3.13: PyThreadState_SetAsyncExc might deliver the exception outside of the thread

3.13bugs and security fixesbugs and security fixes

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

topic-C-API

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

Status: Open.

#139622 In python/cpython;

· yilei opened on Oct 5, 2025

Avoid blindly shadowing existing exceptions through <code>PyErr_Format</code>

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)

topic-C-API

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#139447 In python/cpython;

· picnixz opened on Sep 30, 2025

<code>_PyImport_SwapPackageContext</code> would be helpful if exposed

3.14bugs and security fixesbugs and security fixes

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

topic-C-API

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#139227 In python/cpython;

· ZeroIntensity opened on Sep 22, 2025

Expose Py_SIZE, Py_IS_TYPE, Py_SET_SIZE as functions in the Stable ABI

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

topic-C-API

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#139165 In python/cpython;

· encukou opened on Sep 19, 2025

subtype_dealloc for heap types is a footgun

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

topic-C-API

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

Status: Open.

#138870 In python/cpython;

· da-woods opened on Sep 13, 2025

Improve guidelines for GC protocol implementation for heap types

docsDocumentation in the Doc dirDocumentation in the Doc dir

topic-C-API

Status: Open.

#138292 In python/cpython;

· picnixz opened on Aug 31, 2025

Document constants like <code>Py_tp_repr</code>

docsDocumentation in the Doc dirDocumentation in the Doc dir

topic-C-API

Status: Open.

#138189 In python/cpython;

· encukou opened on Aug 27, 2025

Guard against non-free-threaded extensions in free-threaded builds

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

topic-C-API

topic-free-threading

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#137956 In python/cpython;

· encukou opened on Aug 19, 2025

Please document the exact changes you made in how reference counting changed for 3.14 internally for C-API developers

3.14bugs and security fixesbugs and security fixes

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

docsDocumentation in the Doc dirDocumentation in the Doc dir

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

topic-C-API

Status: Open.

#137791 In python/cpython;

· oddbookworm opened on Aug 15, 2025

Allow ABCMeta in PyType_FromMetaclass

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

topic-C-API

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#137770 In python/cpython;

· WildCard65 opened on Aug 14, 2025

Consistently use <code>order</code> naming for <code>PyBuffer_*</code> functions

easy

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

topic-C-API

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

Status: Open.

#137696 In python/cpython;

· nybblista opened on Aug 12, 2025

Embedded Python creates a large number of memory leaks when trying to load a non-existent module

performancePerformance or resource usagePerformance or resource usage

topic-C-API

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

Status: Open.

#137005 In python/cpython;

· GShabanov opened on Jul 22, 2025