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O(n²) insertion sort in unicodedata.normalize("NFC") canonical ordering

topic-unicode

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

type-securityA security issueA security issue

Status: Open.

#149079 In python/cpython;

· sethmlarson opened on Apr 27, 2026

test_socket tests fail with kernel lacking support for IPPROTO_UDPLITE

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

Status: Open.

#149078 In python/cpython;

· mcepl opened on Apr 27, 2026

Increase test coverage for math.py fabs() function

testsTests in the Lib/test dirTests in the Lib/test dir

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#149059 In python/cpython;

· manoj-km24 opened on Apr 27, 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

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

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.

#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