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memoryview.cast("?") has undocumented undefined behavior

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.

#148390 In python/cpython;

· picnixz opened on Apr 11, 2026

_decimal::CURRENT_CONTEXT: UAF via borrowed reference across Python callbacks

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.

#148382 In python/cpython;

· picnixz opened on Apr 11, 2026

JIT: remove all uses of _PyType_LookupByVersion in optimizer_bytecodes.c

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

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

Status: Open.

#148380 In python/cpython;

· Fidget-Spinner opened on Apr 11, 2026

JIT recorder: allow multiple consecutive recording ops per macro op

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.

#148378 In python/cpython;

· Fidget-Spinner opened on Apr 11, 2026

configparser: quadratic time in ParsingError.combine() when many lines fail to parse

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.

#148370 In python/cpython;

· StanFromIreland opened on Apr 11, 2026

Add more colour to calendar 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.

#148352 In python/cpython;

· hugovk opened on Apr 10, 2026

Document that importlib.resources has the same security model as open()

docsDocumentation in the Doc dirDocumentation in the Doc dir

topic-importlib

type-securityA security issueA security issue

Status: Open.

#148337 In python/cpython;

· sethmlarson opened on Apr 10, 2026

colorsys module and functions are missing docstrings

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

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.

#148330 In python/cpython;

· aiwonderland opened on Apr 10, 2026

Docs: problem with page "8. Errors and Exceptions"

docsDocumentation in the Doc dirDocumentation in the Doc dir

easy

Status: Open.

#148327 In python/cpython;

· StanFromIreland opened on Apr 10, 2026

Variable sized Python objects become fully opaque in abi3t

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-C-API

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#148325 In python/cpython;

· wjakob opened on Apr 10, 2026

b"".join should release GIL in case of memoryview

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

performancePerformance or resource usagePerformance or resource usage

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#148323 In python/cpython;

· googlyrahman opened on Apr 10, 2026

Don't call pager with --clear-screen

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

topic-replRelated to the interactive shellRelated to the interactive shell

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

Status: Open.

#148321 In python/cpython;

· skirpichev opened on Apr 10, 2026