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Broader specialization in the Specializing Adaptive Interpreter for better JIT performance

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.

#143732 In python/cpython;

· markshannon opened on Jan 12, 2026

Documentation for <code>TypedDict.__total__</code> regressed in Python 3.13 docs

docsDocumentation in the Doc dirDocumentation in the Doc dir

Status: Open.

#143728 In python/cpython;

· davidhewitt opened on Jan 12, 2026

Issues in asyncio documentation section "A homemade asyncio.sleep"

docsDocumentation in the Doc dirDocumentation in the Doc dir

topic-asyncio

Status: Open.

#143727 In python/cpython;

· padoremu opened on Jan 12, 2026

Refcount elimination and redundant push/pops pass needs fixing to work together

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

performancePerformance or resource usagePerformance or resource usage

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#143723 In python/cpython;

· Fidget-Spinner opened on Jan 12, 2026

Make struct.Struct() really immutable

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

type-bugAn unexpected behavior, bug, or errorAn 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 providedThe issue will be closed if no feedback is provided

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

topic-email

type-featureA feature request or enhancementA feature request or enhancement

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/ directoryStandard Library Python modules in the Lib/ directory

topic-multiprocessing

type-bugAn unexpected behavior, bug, or errorAn 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 dirDocumentation 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 dirC modules in the Modules dir

type-bugAn unexpected behavior, bug, or errorAn 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 dirC modules in the Modules dir

topic-IO

type-bugAn unexpected behavior, bug, or errorAn 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 fixesbugs and security fixes

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

docsDocumentation in the Doc dirDocumentation 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 dirC modules in the Modules dir

topic-argument-clinic

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#143672 In python/cpython;

· skirpichev opened on Jan 11, 2026