Search results

dataclass tries to generate __init__() even though the class already defines one

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

Status: Open.

#148941 In python/cpython;

· tonyyuyiding opened on Apr 23, 2026

GC in 3.14t can defer too much, resulting in high memory use

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

performancePerformance or resource usagePerformance or resource usage

topic-free-threading

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

Status: Open.

#148937 In python/cpython;

· nascheme opened on Apr 23, 2026

profiling.sampling doesn't work under venv on Windows

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

topic-profiling

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

Status: Open.

#148932 In python/cpython;

· sergey-miryanov opened on Apr 23, 2026

Speed up parser by caching normalized identifiers?

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

performancePerformance or resource usagePerformance or resource usage

topic-parser

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#148931 In python/cpython;

· StanFromIreland opened on Apr 23, 2026

SEGV in _PyObject_ClearFreeLists after exception in subinterpreter

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

topic-subinterpreters

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

Status: Open.

#148929 In python/cpython;

· wiomoc opened on Apr 23, 2026

Expose signal-safe way to get a structured stacktrace

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.

#148925 In python/cpython;

· danielsn opened on Apr 23, 2026

test_urllib2.HandlerTests.test_redirect_no_path fails when proxy environment variables are set

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

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

Status: Open.

#148919 In python/cpython;

· sendaoYan opened on Apr 23, 2026

pickle protocol 5: writable in-band PickleBuffer with empty tobytes() can memoize b'' via BYTEARRAY8, so later bytes references unpickle as bytearray

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.

#148914 In python/cpython;

· madkrouger opened on Apr 23, 2026

Exception ignored in: <function _removeHandlerRef at 0x7b8d7163a7a0>

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.

#148910 In python/cpython;

· khteh opened on Apr 23, 2026

A Dead URL in mro.rst doc

docsDocumentation in the Doc dirDocumentation in the Doc dir

Status: Open.

#148909 In python/cpython;

· ByteFlowing1337 opened on Apr 23, 2026

poor scaling of descriptors in free-threading

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

performancePerformance or resource usagePerformance or resource usage

topic-free-threading

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

Status: Open.

#148906 In python/cpython;

· kumaraditya303 opened on Apr 23, 2026

Crash in HAMT during garbage collection

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.

#148891 In python/cpython;

· KowalskiThomas opened on Apr 22, 2026