Python 3.13.1 Released November 2025 !new! May 2026

Elena’s own company, a fintech startup that processed real-time currency trades, had a twenty-thousand-line module written by a long-departed genius who had assumed, incorrectly, that list.append was safe across threads because “the GIL will save us.”

Elena, now a member of the Python Steering Council (she had been elected in December, a decision she still questioned at 3 AM), cast the deciding vote. python 3.13.1 released november 2025

Of course, paradise had a patch note.

She wrote in her notebook: "It’s real. Python just grew a second lung." Elena’s own company, a fintech startup that processed