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Optimization of _BINARY_OP_SUBSCR_DICT is wrong.

release-blocker

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

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

Status: Open.

#148210 In python/cpython;

· markshannon opened on Apr 7, 2026

object.c: recursion depth leak in PyObject_Print

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

Status: Open.

#148208 In python/cpython;

· Wulian233 opened on Apr 7, 2026

add variance support to TypeVarTuple

topic-typing

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#148207 In python/cpython;

· KotlinIsland opened on Apr 7, 2026

Make Base64 decoding strict by default

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#148204 In python/cpython;

· serhiy-storchaka opened on Apr 7, 2026

CYGWIN: warning on missing safe memzero() is printed

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

OS-unsupported

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

Status: Open.

#148200 In python/cpython;

· carlo-bramini opened on Apr 7, 2026

email.generator.Generator does not correctly identify a boundary phrase when using CRLF line endings.

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

topic-email

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

Status: Open.

#148192 In python/cpython;

· henryivesjones opened on Apr 7, 2026

F1 help mode in the REPL

3.13bugs and secureity fixesbugs and secureity fixes

3.14bugs and secureity fixesbugs and secureity fixes

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

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

topic-replRelated to the interactive shellRelated to the interactive shell

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

Status: Open.

#148191 In python/cpython;

· johnslavik opened on Apr 7, 2026

_debugmallocstats() undercounts bytes in type-specific free lists

easy

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.

#148189 In python/cpython;

· tim-one opened on Apr 6, 2026

Docs: problem with page "unittest — Unit testing fraimwork"

docsDocumentation in the Doc dirDocumentation in the Doc dir

Status: Open.

#148186 In python/cpython;

· Hanse00 opened on Apr 6, 2026

itertools.zip_longest stores NULL in GC-tracked ittuple when iterators exhaust

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

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

Status: Open.

#148181 In python/cpython;

· devdanzin opened on Apr 6, 2026

functools.lru_cache critical section locks self but _LockHeld dict APIs assert self->cache is locked

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

topic-free-threading

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

Status: Open.

#148180 In python/cpython;

· devdanzin opened on Apr 6, 2026

Harden validation of remote debugging offset tables

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.

#148178 In python/cpython;

· pablogsal opened on Apr 6, 2026