Python News Today Release 3.13 November 2025 -

— The RealPython Team, November 2025

import interpreters import math def is_prime(n): return all(n % i != 0 for i in range(2, int(math.sqrt(n)) + 1)) python news today release 3.13 november 2025

Why? Because hundreds of C extensions (including numpy , cryptography , lxml ) are not yet thread-safe without the GIL. However, the Python team expects GIL-free builds to become fully supported by . — The RealPython Team, November 2025 import interpreters