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[ENH] PEP 634 - Structural Pattern Matching

feature

Python SemanticsGeneral Python (3) language semanticsGeneral Python (3) language semantics

Status: Open.

#4029 In cython/cython;

· da-woods opened on Mar 8, 2021

Improve deduction of const in templates

C++

Status: Open (in progress).

cython/cythonnumber 7234

#7234 In cython/cython;

· da-woods opened on Oct 19, 2025

Add support of <code>CythonArrayNode</code> in <code>cast()</code>

Pure Python Mode

Status: Open (in progress).

cython/cythonnumber 7224

#7224 In cython/cython;

· matusvalo opened on Oct 16, 2025

[BUG] performance regressions in 3.1

defect

performance

Status: Open.

#6710 In cython/cython;

· scoder opened on Mar 9, 2025

PyLongCompare is redundant with PyLongBinop

cleanup

Status: Open.

#7245 In cython/cython;

· scoder opened on Oct 21, 2025

Error out when variable is redeclared

Error Reporting

Pure Python Mode

Status: Open (in progress).

cython/cythonnumber 7253

#7253 In cython/cython;

· matusvalo opened on Oct 23, 2025

Add function types and C++ reference types to Pure Python mode

feature

Pure Python Mode

Status: Open (in progress).

cython/cythonnumber 7121

#7121 In cython/cython;

· dgrunwald-qt opened on Aug 29, 2025

[ENH] Allow function pointers in Python code

feature

Pure Python Mode

Status: Open.

#4279 In cython/cython;

· scoder opened on Jul 13, 2021

Implement len((a,b,c)) and ctuple indexing

Cython Language Feature

enhancement

Status: Open (in progress).

cython/cythonnumber 6446

#6446 In cython/cython;

· bbb23exposed opened on Oct 24, 2024

Allow Cython to understand subscripted types

feature

Pure Python Mode

Status: Open (in progress).

cython/cythonnumber 7288

#7288 In cython/cython;

· matusvalo opened on Nov 5, 2025

Speed up sequence subscripting using Py_TPFLAGS_SEQUENCE

enhancement

Optimization

Status: Open (in progress).

cython/cythonnumber 7432

#7432 In cython/cython;

· scoder opened on Dec 26, 2025

Do not implement mapping slots if method has sequence index argument types

Code Generation

Cython Language Feature

enhancement

Python SemanticsGeneral Python (3) language semanticsGeneral Python (3) language semantics

Status: Open (in progress).

cython/cythonnumber 7435

#7435 In cython/cython;

· scoder opened on Dec 28, 2025

Special case Python comparisons of int/float objects

Code Generation

enhancement

performance

Status: Open (in progress).

cython/cythonnumber 7452

#7452 In cython/cython;

· scoder opened on Jan 9, 2026

Rewrite import-star name matching to avoid lengthy chains of if-elif comparisons

Code Generation

enhancement

Status: Open (in progress).

cython/cythonnumber 7466

#7466 In cython/cython;

· scoder opened on Jan 15, 2026

Reduce the list of names checked in import-star

Code Generation

defect

Status: Open (in progress).

cython/cythonnumber 7467

#7467 In cython/cython;

· scoder opened on Jan 16, 2026