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PEP 829: resolve the design of the site dir batch processing API

3.15pre-release feature fixes, bugs and security fixespre-release feature fixes, bugs and security fixes

3.16new features, bugs and security fixesnew features, bugs and security fixes

docsDocumentation in the Doc dirDocumentation in the Doc dir

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.

#150228 In python/cpython;

· ncoghlan opened on May 22, 2026

Speed up uuid.UUID string parsing

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.

#150226 In python/cpython;

· esadomer opened on May 22, 2026

Enhance Enum's default ValueError to list valid member values

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.

#150220 In python/cpython;

· drain99 opened on May 22, 2026

_interpchannels: missing PyErr_NoMemory() causes SystemErroron OOM in {create,close}()

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

topic-subinterpreters

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

Status: Open.

#150213 In python/cpython;

· lpyu001 opened on May 22, 2026

pyconfig.h string values are double-quoted in sysconfigdat

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

topic-sysconfig

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

Status: Open.

#150208 In python/cpython;

· stefanor opened on May 22, 2026

Allocation failures generated in _PyTokenizer_FromUTF8 lead to SystemError/abort()s

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

topic-parser

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

Status: Open.

#150207 In python/cpython;

· stestagg opened on May 21, 2026

Tail call interpreter makes test_gdb fail on -O0 optimization level

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

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

Status: Open.

#150206 In python/cpython;

· stratakis opened on May 21, 2026

Literal idiom for empty set ast.unparse symmetry

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.

#150204 In python/cpython;

· gesslerpd opened on May 21, 2026

Test failures on no-GIL interpreter macOS 26 ARM64 with UBSan

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

Status: Open.

#150195 In python/cpython;

· clin1234 opened on May 21, 2026

Data race in test_ssl.test_sni_callback_race

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

topic-free-threading

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

Status: Open.

#150191 In python/cpython;

· colesbury opened on May 21, 2026

abi3-abi3t documentation update

docsDocumentation in the Doc dirDocumentation in the Doc dir

Status: Open.

#150187 In python/cpython;

· hydrogen-mvm opened on May 21, 2026

hamt.c: sub_node leaked in bitmap_assoc and bitmap_without

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

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

Status: Open.

#150178 In python/cpython;

· lpyu001 opened on May 21, 2026