Python Release 3.13.1 December 2025 Upd Jun 2026

The 3.13 branch is notable for introducing several "experimental" features that have become more refined throughout 2025:

def classify(value): match value: case "type": "user", "age": age if age >= 18: return "adult_user" case "type": "user", "age": age if age < 18: return "minor_user" case "type": "admin": return "admin" case _: return "unknown"

The prompt will display something like myapp-3.13 . python release 3.13.1 december 2025

Python 3.13 introduced experimental free-threading ( --disable-gil ). Version 3.13.1 resolves over 30 race conditions discovered in the initial release. The threading module now handles reference counts more predictably under high concurrency. While still experimental, early adopters report 20% fewer crashes in multi-threaded web workloads.

Following PEP 6 , the 3.13.1 release focuses exclusively on bug fixes, documentation improvements, and security patches. No new features, no ABI changes—just a more reliable interpreter. The threading module now handles reference counts more

The Python Software Foundation has officially released , the first bugfix update of the 3.13 series. Arriving exactly three months after the major 3.13.0 launch in September 2025, this release isn’t about flashy new features—it’s about hardening the runtime for production.

--enable-optimizations triggers the new PGO/LTO pipeline that now also includes the zero‑cost exception handling optimisation. No new features, no ABI changes—just a more

# Download & extract wget https://www.python.org/ftp/python/3.13.1/Python-3.13.1.tgz tar -xf Python-3.13.1.tgz cd Python-3.13.1