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Use PEP 661 (sentinels) in the standard library

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

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

Status: Open.

#149083 In python/cpython;

· JelleZijlstra opened on Apr 28, 2026

json.load doesn't properly forward array_hook to json.loads

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.

#149056 In python/cpython;

· KowalskiThomas opened on Apr 27, 2026

SimpleCookie regex can make parsing extremely slow for adversarial payloads

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

release-blocker

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

bdb.clear_all_file_breaks skips breakpoints when multiple breakpoints share a line

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.

#149015 In python/cpython;

· kioscos365olav-debug opened on Apr 26, 2026

Improve inspect module CLI handling of non-source modules

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

triagedThe issue has been accepted as valid by a triager.The issue has been accepted as valid by a triager.

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#149010 In python/cpython;

· ncoghlan opened on Apr 26, 2026

xmlrpc.client lacks sanitization in methodname

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

topic-XML

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

Status: Open.

#148954 In python/cpython;

· DarkaMaul opened on Apr 24, 2026

Endless polling EOF socket

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.

#148950 In python/cpython;

· Kraksna83 opened on Apr 24, 2026

Unable to execute str(importlib.metadata.metadata("x'x'x"))

3.13bugs and security fixesbugs and security fixes

3.14bugs and security fixesbugs and security fixes

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

topic-importlib

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

Status: Open.

#148944 In python/cpython;

· Jesse205 opened on Apr 24, 2026

dataclass tries to generate __init__() even though the class already defines one

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.

#148941 In python/cpython;

· tonyyuyiding opened on Apr 23, 2026

pickle protocol 5: writable in-band PickleBuffer with empty tobytes() can memoize b'' via BYTEARRAY8, so later bytes references unpickle as bytearray

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.

#148914 In python/cpython;

· madkrouger opened on Apr 23, 2026

REPL pasting behavior is different on Windows and unix consoles

OS-windows

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.

#148861 In python/cpython;

· GabrielvMarinho opened on Apr 22, 2026