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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

Add support of CythonArrayNode in cast()

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

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

[BUG] Optimised comparisons fail to detect that they need the GIL

defect

Type Analysis

Status: Open.

#7500 In cython/cython;

· scoder opened on Feb 5, 2026

[BUG] Python bool casts are inconsistent

Cython Language Feature

defect

Error Reporting

Type Analysis

Status: Open.

#7513 In cython/cython;

· scoder opened on Feb 9, 2026

Allow casting C values to Python 'bool'

enhancement

Type Analysis

Status: Draft (not ready).

cython/cythonnumber 7515

#7515 In cython/cython;

· scoder opened on Feb 10, 2026

Change default string compression (currently zlib)

Code Generation

feature

Status: Open.

#7551 In cython/cython;

· scoder opened on Mar 4, 2026

Document the binary interface of cimported modules (.pxd ABI rules, capsule signature checks)

Documentation

Status: Open.

#7603 In cython/cython;

· rgommers opened on Mar 29, 2026

Infer subscripted types of initialised variables

Type Analysis

Status: Open (in progress).

cython/cythonnumber 7686

#7686 In cython/cython;

· matusvalo opened on May 12, 2026

Implement support of subscripted types of tuple

Type Analysis

Status: Open (in progress).

cython/cythonnumber 7704

#7704 In cython/cython;

· matusvalo opened on May 19, 2026

Let vectorcall use cached literal kwnames tuples

Code Generation

enhancement

Status: Open (in progress).

cython/cythonnumber 7713

#7713 In cython/cython;

· da-woods opened on May 24, 2026

[BUG] list[cython.int] generates working but bad code

Optimization

Type Analysis

Status: Open.

#7729 In cython/cython;

· da-woods opened on May 30, 2026

Avoid useless incref-decref cycles in the inner listcomp loop

Code Generation

enhancement

Status: Open (in progress).

cython/cythonnumber 7748

#7748 In cython/cython;

· scoder opened on Jun 13, 2026