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Class-scope inlined comprehensions can crash the compiler when a nested function captures class

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

Status: Open.

#150700 In python/cpython;

· steve-s opened on Jun 1, 2026

Segfault between _io_StringIO___init___impl and _io_StringIO_truncate_impl with free-threading

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

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

topic-free-threading

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

Status: Open.

#150695 In python/cpython;

· Naserume opened on Jun 1, 2026

Combine duplicate "Other Resources" sections on docs front page

docsDocumentation in the Doc dirDocumentation in the Doc dir

Status: Open.

#150693 In python/cpython;

· miameows opened on May 31, 2026

Deprecate and remove PyAsyncGen_New(), PyCoro_New(), PyGen_New() and PyGen_NewWithQualName() functions

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.

#150671 In python/cpython;

· sobolevn opened on May 31, 2026

Document that PyErr_SetRaisedException() accepts NULL

docsDocumentation in the Doc dirDocumentation in the Doc dir

topic-C-API

Status: Open.

#150663 In python/cpython;

· philthompson10 opened on May 31, 2026

Tachyon --gecko collector memory growing ad infinitum

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

topic-profiling

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

Status: Open.

#150662 In python/cpython;

· maurycy opened on May 31, 2026

Decide on fate of missing C23 math.h functions

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

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#150646 In python/cpython;

· skirpichev opened on May 31, 2026

macOS 26 system log redirection reports all content as <private>

3.13bugs and security fixesbugs and security fixes

3.14bugs and security fixesbugs and security fixes

3.15pre-release feature fixes, bugs and security fixespre-release feature fixes, bugs and security fixes

OS-ios

OS-mac

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

Status: Open.

#150644 In python/cpython;

· freakboy3742 opened on May 31, 2026

typing - evaluating forward references in STRING format can 'leak' internal names

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

topic-typing

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

Status: Open.

#150641 In python/cpython;

· cossor opened on May 31, 2026

Improve performance of json.loads and json.load for numeric data

performancePerformance or resource usagePerformance or resource usage

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.

#150638 In python/cpython;

· eendebakpt opened on May 30, 2026

Module names containing null bytes bypass the sys.modules cache

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

topic-importlib

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

Status: Open.

#150633 In python/cpython;

· KowalskiThomas opened on May 30, 2026

Clarify that format strings accept arbitrary tokens as field names

docsDocumentation in the Doc dirDocumentation in the Doc dir

Status: Open.

#150626 In python/cpython;

· lgalfaso opened on May 30, 2026