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Optimize object creation and method calls in the JIT by resolving __init__ at trace compile time

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

performancePerformance or resource usagePerformance or resource usage

topic-JIT

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#148276 In python/cpython;

· eendebakpt opened on Apr 8, 2026

PyObject_VisitManagedDict result ignored in a lot of places

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

topic-C-API

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

Status: Open.

#148274 In python/cpython;

· maxbachmann opened on Apr 8, 2026

Improve object.__reduce_ex__ performance up to 20%

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

performancePerformance or resource usagePerformance or resource usage

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#148269 In python/cpython;

· Bobronium opened on Apr 8, 2026

unsafe_{latin,long,float}_compare have an assert that assumes PyObject_RichCompareBool can't fail

easy

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

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

Status: Open.

#148268 In python/cpython;

· StanFromIreland opened on Apr 8, 2026

PEP 803: Py_GIL_DISABLED is tested prior to setting, in patchlevel.h

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)

topic-C-API

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

Status: Open.

#148267 In python/cpython;

· mgorny opened on Apr 8, 2026

weakrefobject.c: WRAP_BINARY ref leak with dead proxy

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.

#148263 In python/cpython;

· prakashsellathurai opened on Apr 8, 2026

test_threading.test_recursion_limit() does crash (segfault) on Alpine Linux (musl)

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

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

topic-free-threading

Status: Open.

#148260 In python/cpython;

· vstinner opened on Apr 8, 2026

Race condition in list.remove under free-threading

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

topic-free-threading

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

Status: Open.

#148259 In python/cpython;

· KowalskiThomas opened on Apr 8, 2026

JIT: drop -fno-plt on Linux x86-64

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.

#148256 In python/cpython;

· diegorusso opened on Apr 8, 2026

Windows PGO Tailcall build failed with error MSB4166: Child node "6" exited prematurely

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)

OS-windows

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

Status: Open.

#148255 In python/cpython;

· vstinner opened on Apr 8, 2026

timeit hardcodes plural "secs"

easy

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.

#148254 In python/cpython;

· StanFromIreland opened on Apr 8, 2026

_remote_debugging: prevent 32-bit integer overflow when decoding stack data from .pyb files

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.

#148252 In python/cpython;

· pablogsal opened on Apr 8, 2026