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unittest.mock: Double period in AttributeError message for invalid assertion methods

stdlibPython modules in the Lib dirPython modules in the Lib dir

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

Status: Open.

#137716 In python/cpython;

· rohanwinsor opened on Aug 13, 2025

Annotated with forward references does not partially evaluate

stdlibPython modules in the Lib dirPython modules in the Lib dir

topic-typing

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

Status: Open.

#137706 In python/cpython;

· DavidCEllis opened on Aug 13, 2025

Email MIME base64 parsing issue

stdlibPython modules in the Lib dirPython modules in the Lib dir

topic-email

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

Status: Open.

#137687 In python/cpython;

· spencerwuwu opened on Aug 12, 2025

macOS: Python Launcher app reported in system profiler as "iOS" app rather than "Apple Chips" app

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

OS-mac

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.

#137673 In python/cpython;

· sierkb opened on Aug 12, 2025

Inconsistent dataclass order behavior on Python 3.13+

stdlibPython modules in the Lib dirPython modules in the Lib dir

topic-dataclasses

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

Status: Open.

#137658 In python/cpython;

· gesslerpd opened on Aug 12, 2025

Dependabot updates have ceased to be

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

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

Status: Open.

#137650 In python/cpython;

· AA-Turner opened on Aug 11, 2025

Unexplained performance slowdown on both official 3.13.6 and 3.14 regarding hash collisions - reproduced on dict[int, int] and set[int], cannot be reproduced when building Python locally

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

performancePerformance or resource usagePerformance or resource usage

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

Status: Open.

#137636 In python/cpython;

· JasonMendoza2008 opened on Aug 11, 2025

<code>csv.Sniffer._guess_delimiter()</code> iterates over all ASCII on each line

stdlibPython modules in the Lib dirPython modules in the Lib dir

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

Status: Open.

#137627 In python/cpython;

· maurycy opened on Aug 11, 2025

The error messages of <code>dict()</code> and <code>dict().update()</code> should say <code>positional argument</code> instead of only <code>argument</code>

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.

#137626 In python/cpython;

· hyperkai opened on Aug 11, 2025

PYTHON_FOR_REGEN does not allow 3.14 or 3.15

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

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

Status: Open.

#137618 In python/cpython;

· AA-Turner opened on Aug 10, 2025

Patched async function not registering calls until coroutine is awaited

stdlibPython modules in the Lib dirPython modules in the Lib dir

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

Status: Open.

#137594 In python/cpython;

· GabrielSalla opened on Aug 9, 2025

zipfile tests: some files are left opened

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.

#137589 In python/cpython;

· Rogdham opened on Aug 9, 2025