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<code>python upgrade</code> - One Command to Upgrade Python

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#143130 In python/cpython;

· city25 opened on Dec 24, 2025

JIT: Assertion failure in <code>_PyOptimizer_Optimize</code>

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

topic-JIT

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

Status: Open.

#143123 In python/cpython;

· devdanzin opened on Dec 23, 2025

Avoid thread leaks for thread sanitizer

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

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

topic-multiprocessing

Status: Open.

#143121 In python/cpython;

· colesbury opened on Dec 23, 2025

Add pixi builds for TSan + free-threading to aid downstream development.

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

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#143120 In python/cpython;

· ngoldbaum opened on Dec 23, 2025

JIT: strength reduce _LOAD_FAST{_BORROW} to _LOAD_CONST_INLINE_BORROW

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.

#143117 In python/cpython;

· Fidget-Spinner opened on Dec 23, 2025

base64.z85encode should have "pad" parameter

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.

#143103 In python/cpython;

· haukex opened on Dec 23, 2025

<code>memcpy</code> data race in <code>setobject.c</code>

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.

#143100 In python/cpython;

· colesbury opened on Dec 23, 2025

JIT: Segfault from invalid memory read in <code>_PyTier2Interpreter</code>

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

topic-JIT

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

Status: Open.

#143092 In python/cpython;

· devdanzin opened on Dec 23, 2025

The docstring of <code>ParamSpec</code> should show two examples with a list instead of a tuple

topic-typing

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

Status: Open.

#143089 In python/cpython;

· hyperkai opened on Dec 23, 2025

Arrow key history broken when stdin is passed explicitly on pdb

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.

#143082 In python/cpython;

· zelosleone opened on Dec 22, 2025

Tkinter - _tkinter.TclError: invalid boolean operator in tag search expression

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

topic-tkinter

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

Status: Open.

#143070 In python/cpython;

· ThingamabobsCoding opened on Dec 22, 2025

Implement PEP 798

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.

#143055 In python/cpython;

· adqm opened on Dec 21, 2025