Cpython Release November 2025 New [2021] -

The experimental "no-GIL" build from Python 3.13 is now an officially supported variant. This allows CPU-bound Python threads to run in true parallel on multi-core systems, though it currently requires a specialized installer or build flag.

The concurrent.interpreters module is now in the standard library, enabling isolated execution environments within a single process. This offers a new concurrency model that bypasses Global Interpreter Lock (GIL) contention without the overhead of separate processes. cpython release november 2025 new

Introducing the t"" prefix, PEP 750 provides a more controlled way to perform string interpolation. Unlike f-strings, t-strings return a Template object, allowing for custom processing and safer domain-specific substitutions. The experimental "no-GIL" build from Python 3

Type annotations are now evaluated lazily by default. This change significantly reduces startup overhead and removes the need for from __future__ import annotations to handle forward references. This offers a new concurrency model that bypasses

Python 3.14, nicknamed "Pi" due to its version number, is now the stable standard. This release introduced several landmark features that developers are beginning to integrate this November:

A new compression.zstd module brings built-in support for the high-performance Zstandard compression algorithm. Python 3.15: The Alpha Phase Begins What's new in Python 3.14 — Python 3.14.4 documentation