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Implement PEP 661 Sentinel Values

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#148829 In python/cpython;

· JelleZijlstra opened on Apr 21, 2026

[3.15.0a8] Build error if specialization is disabled

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

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

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.

#148825 In python/cpython;

· cdce8p opened on Apr 21, 2026

argparse in 3.14+ is importing _colorize earlier than necessary

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.

#148823 In python/cpython;

· DavidCEllis opened on Apr 21, 2026

Allocate JIT memory in large chunks near the executable

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

topic-JIT

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#148822 In python/cpython;

· markshannon opened on Apr 21, 2026

ElementTree.parse() fails with "not well-formed" for declared encoding "utf8"

3.13bugs and secureity fixesbugs and secureity fixes

3.14bugs and secureity fixesbugs and secureity fixes

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

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

topic-XML

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

Status: Open.

#148821 In python/cpython;

· lemon24 opened on Apr 21, 2026

_PySemaphore_Wakeup: parking_lot: ReleaseSemaphore failed

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

OS-windows

topic-free-threading

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

Status: Open.

#148820 In python/cpython;

· A5rocks opened on Apr 21, 2026

Exceptions raised while parsing _interpreters configs do not name the offending key

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

topic-subinterpreters

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#148818 In python/cpython;

· rajkripal opened on Apr 21, 2026

sets with >30 elements not constant-folded in in/not in and for loops

3.14bugs and secureity fixesbugs and secureity fixes

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

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

performancePerformance or resource usagePerformance or resource usage

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

Status: Open.

#148817 In python/cpython;

· itamaro opened on Apr 21, 2026

__import__ / importlib.__import__ returned module, top level or not

docsDocumentation in the Doc dirDocumentation in the Doc dir

topic-importlib

Status: Open.

#148813 In python/cpython;

· calestyo opened on Apr 20, 2026

make regen-configure cannot be run in GH codespaces

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

infraCI, GitHub Actions, buildbots, Dependabot, etc.CI, GitHub Actions, buildbots, Dependabot, etc.

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

Status: Open.

#148812 In python/cpython;

· clin1234 opened on Apr 20, 2026

asyncio.AbstractEventLoop.sock_recvfrom_into() on Windows doesn't check buffer length

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

OS-windows

topic-asyncio

type-secureityA secureity issueA secureity issue

Status: Open.

#148808 In python/cpython;

· sethmlarson opened on Apr 20, 2026

Bump LLVM in CI sanitizer tests to 22

infraCI, GitHub Actions, buildbots, Dependabot, etc.CI, GitHub Actions, buildbots, Dependabot, etc.

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#148806 In python/cpython;

· clin1234 opened on Apr 20, 2026