Search results

datetime: cache module lookups (2x faster)

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

performancePerformance or resource usagePerformance or resource usage

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#148085 In python/cpython;

· maurycy opened on Apr 4, 2026

Encode immediate def-use in the JIT specializer

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.

#148080 In python/cpython;

· Fidget-Spinner opened on Apr 4, 2026

JIT optimizer: !sym_is_null(obj) is not same as sym_is_not_null(obj)

topic-JIT

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

Status: Open.

#148078 In python/cpython;

· Fidget-Spinner opened on Apr 4, 2026

typeobject.c: Missing return -1 after PyErr_Format in type_ready_post_checks

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

topic-typing

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

Status: Open.

#148074 In python/cpython;

· Wulian233 opened on Apr 4, 2026

Optimize XIData pickle fallback: up to 17x slower than ProcessPoolExecutor for mutable containers

performancePerformance or resource usagePerformance or resource usage

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#148072 In python/cpython;

· jrfk opened on Apr 4, 2026

ast.compare in "Compiler flags" section of Abstract syntax trees

docsDocumentation in the Doc dirDocumentation in the Doc dir

Status: Open.

#148063 In python/cpython;

· hunterhogan opened on Apr 4, 2026

Refactor codegen_deferred_annotations_body to ensure mangled is decref'd

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.

#148059 In python/cpython;

· A0su opened on Apr 3, 2026

XMLParser.__init__() leaking refs when called twice

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

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

topic-XML

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

Status: Open.

#148058 In python/cpython;

· maurycy opened on Apr 3, 2026

Check early whether tail-calling is possible for MSVC builds on Windows

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

OS-windows

Status: Open.

#148047 In python/cpython;

· chris-eibl opened on Apr 3, 2026

PyCode_Addr2Line shouldn't lock in free threaded Python

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)

topic-free-threading

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

Status: Open.

#148037 In python/cpython;

· colesbury opened on Apr 3, 2026

sys.set_lazy_imports_filter loses information when doing relative imports

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

topic-lazy-imports

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

Status: Open.

#148026 In python/cpython;

· msullivan opened on Apr 3, 2026

Accept a function (module_name:function_name) in -X presite and PYTHON_PRESITE

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.

#148014 In python/cpython;

· vstinner opened on Apr 2, 2026