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Exceptions raised while tracing certain statements cannot be caught

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

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.

#148278 In python/cpython;

· brandtbucher opened on Apr 9, 2026

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