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Improve "Leading padding not allowed" error in Base32 and Base64 decoders

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

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

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#148016 In python/cpython;

· serhiy-storchaka opened on Apr 2, 2026

Accept a function (module_name:function_name) in -X presite and PYTHON_PRESITE

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

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#148014 In python/cpython;

· vstinner opened on Apr 2, 2026

Publicly expose shutil.ReadError and shutil.RegistryError

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.

#148001 In python/cpython;

· WYSIATI opened on Apr 2, 2026

Avoid memory leak in _pop_preserved()

3.14bugs and security fixesbugs and security fixes

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

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

Status: Open.

#147998 In python/cpython;

· maurycy opened on Apr 2, 2026

Improve tomllib startup time

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.

#147991 In python/cpython;

· vstinner opened on Apr 2, 2026

Add discover() method to (all) finders

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

topic-importlib

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#147990 In python/cpython;

· FFY00 opened on Apr 1, 2026

Use lock-free lookup for PySet_Contains()

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

performancePerformance or resource usagePerformance or resource usage

topic-free-threading

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#147985 In python/cpython;

· nascheme opened on Apr 1, 2026

Building against libuuid without pkgconfig fails if OSSP uuid is installed

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

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

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

Status: Open.

#147977 In python/cpython;

· tobbez opened on Apr 1, 2026

Indicate that multiprocessing.Queue does not implement shutdown()

docsDocumentation in the Doc dirDocumentation in the Doc dir

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

topic-multiprocessing

Status: Open.

#147965 In python/cpython;

· YvesDup opened on Apr 1, 2026

Support Nested/Dependent Mutually Exclusive Arguments in argparse

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.

#147964 In python/cpython;

· Tailung42 opened on Apr 1, 2026

popitem from UserDict in LIFO order

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.

#147957 In python/cpython;

· Andrew5057 opened on Apr 1, 2026

_pyrepl: Additionally bind yank-arg to M-_

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-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#147950 In python/cpython;

· L3viathan opened on Mar 31, 2026