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Parser: error check doesn't propagate errors in NEW_TYPE_COMMENT

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

topic-parser

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

Status: Open.

#145783 In python/cpython;

· StanFromIreland opened on Mar 10, 2026

Free threaded scaling issues with @classmethod and @staticmethod

3.14bugs and security fixesbugs and security fixes

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

performancePerformance or resource usagePerformance or resource usage

topic-free-threading

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

Status: Open.

#145779 In python/cpython;

· colesbury opened on Mar 10, 2026

3.15.0a7 has test_tools failing over AssertionError: LIBRARY_FUZZER_PATHS contains an invalid entry: PosixPath('.github/workflows/reusable-cifuzz.yml')

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.

#145762 In python/cpython;

· mgorny opened on Mar 10, 2026

Autospeccing with unittest.mock is less robust with PEP 649

3.14bugs and security fixesbugs and security fixes

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

topic-typing

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

Status: Open.

#145754 In python/cpython;

· Daverball opened on Mar 10, 2026

Remove DELETE_FAST bytecode instruction

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

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

performancePerformance or resource usagePerformance or resource usage

Status: Open.

#145749 In python/cpython;

· markshannon opened on Mar 10, 2026

Feasible to extend sanitizer coverage beyond Ubuntu 24.04 x64 within CI?

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

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

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#145745 In python/cpython;

· clin1234 opened on Mar 10, 2026

Some (mostly) easy ways to reduce the size of JIT generated code

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.

#145742 In python/cpython;

· markshannon opened on Mar 10, 2026

Tkinter tests fail with Tk 8.7, 9.0 and 9.1

3.14bugs and security fixesbugs and security fixes

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

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

topic-tkinter

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

Status: Open.

#145736 In python/cpython;

· serhiy-storchaka opened on Mar 10, 2026

Add .efi file detection in mimetypes

stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#145719 In python/cpython;

· clin1234 opened on Mar 10, 2026

Add a few Microsoft-specific MIME types, and synchronize between mimetypes module and tests

stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#145717 In python/cpython;

· clin1234 opened on Mar 10, 2026

bytearray.resize is not thread-safe

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

topic-free-threading

triagedThe issue has been accepted as valid by a triager.The issue has been accepted as valid by a triager.

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

Status: Open.

#145713 In python/cpython;

· KowalskiThomas opened on Mar 9, 2026

asyncio.BaseEventLoop clock resolution becomes too low over time

stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

topic-asyncio

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

Status: Open.

#145703 In python/cpython;

· CaptainFlint opened on Mar 9, 2026