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Make struct.Struct() really immutable

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

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

Status: Open.

#143715 In python/cpython;

· skirpichev opened on Jan 12, 2026

email package: UnicodeEncodeError in as_bytes() when folding malformed Subject header mixing raw UTF‐8 and encoded‐words

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

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

topic-email

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

Status: Open.

#143712 In python/cpython;

· DRSpalding opened on Jan 11, 2026

<code>sys.argv</code> no longer correct during main module execution using <code>forkserver</code>

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

topic-multiprocessing

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

Status: Open.

#143706 In python/cpython;

· tpwrules opened on Jan 11, 2026

Document secrets.DEFAULT_ENTROPY as an opaque value

docsDocumentation in the Doc dir Documentation in the Doc dir

Status: Open.

#143700 In python/cpython;

· viccie30 opened on Jan 11, 2026

SystemError when passing invalid argument to posix_spawn

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

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

Status: Open.

#143698 In python/cpython;

· donbarbos opened on Jan 11, 2026

_io.BufferedReader.read1() leaves object in reentrant state after MemoryError

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

topic-IO

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

Status: Open.

#143689 In python/cpython;

· hyongtao-code opened on Jan 11, 2026

Struct module docstring lacks format characters for complex types (F/D)

3.14bugs and security fixes bugs and security fixes

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

docsDocumentation in the Doc dir Documentation in the Doc dir

Status: Open.

#143674 In python/cpython;

· skirpichev opened on Jan 11, 2026

Convert the struct module to use the Argument Clinic

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

topic-argument-clinic

type-featureA feature request or enhancement A feature request or enhancement

Status: Open.

#143672 In python/cpython;

· skirpichev opened on Jan 11, 2026

Specialize FOR_ITER for dict.items()

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

performancePerformance or resource usage Performance or resource usage

type-featureA feature request or enhancement A feature request or enhancement

Status: Open.

#143667 In python/cpython;

· Fidget-Spinner opened on Jan 10, 2026

TarFile.extractall() doesn't properly handle UNC paths

OS-windows

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

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

Status: Open.

#143663 In python/cpython;

· 0xd6cb6d73 opened on Jan 10, 2026

Null pointer dereference in <code>cursor.fetchone</code> after re-entrant <code>text_factory</code> closes connection

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

topic-sqlite3

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

Status: Open.

#143662 In python/cpython;

· jackfromeast opened on Jan 10, 2026

importlib.metadata: Use <code>str.translate</code> to improve performance of <code>importlib.metadata.Prepared.normalized</code>

performancePerformance or resource usage Performance or resource usage

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

topic-importlib

type-featureA feature request or enhancement A feature request or enhancement

Status: Open.

#143658 In python/cpython;

· hugovk opened on Jan 10, 2026