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Note that configparser.ConfigParser.items returns a collections.abc.ItemsView in the first overload

docsDocumentation in the Doc dirDocumentation in the Doc dir

Status: Open.

#149050 In python/cpython;

· jonathandung opened on Apr 27, 2026

JIT: Assertion failure Stack underflow (depth = -1)

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

topic-JIT

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

Status: Open.

#149049 In python/cpython;

· devdanzin opened on Apr 27, 2026

StringIO breaking change for str subclasses

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-IO

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

Status: Open.

#149046 In python/cpython;

· KowalskiThomas opened on Apr 27, 2026

TSan warning on lock unparking

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.

#149045 In python/cpython;

· dpdani opened on Apr 27, 2026

Implement PEP 820 – PySlot: Unified slot system for the C API

topic-C-API

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#149044 In python/cpython;

· encukou opened on Apr 27, 2026

TSan-reported race during finialization

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.

#149043 In python/cpython;

· dpdani opened on Apr 27, 2026

Modernize legacy Python patterns and outdated syntax in documentation

docsDocumentation in the Doc dirDocumentation in the Doc dir

Status: Open.

#149035 In python/cpython;

· ByteFlowing1337 opened on Apr 27, 2026

Update macOS and Windows installers to SQLite 3.53.0

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

OS-android

OS-mac

OS-windows

topic-sqlite3

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#149029 In python/cpython;

· adamchainz opened on Apr 26, 2026

SimpleCookie regex can make parsing extremely slow for adversarial payloads

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

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

Status: Open.

#149028 In python/cpython;

· KowalskiThomas opened on Apr 26, 2026

Add colour to pickletools 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.

#149026 In python/cpython;

· hugovk opened on Apr 26, 2026

Invalid SHELL in Makefile for AIX builds?

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

OS-unsupported

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

Status: Open.

#149021 In python/cpython;

· sideeffect42 opened on Apr 26, 2026

[security] Insufficient entropy in pyexpat with protection against hash flooding

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

topic-XML

type-securityA security issueA security issue

Status: Open.

#149018 In python/cpython;

· hartwork opened on Apr 26, 2026