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Release 2026-02 follow-up #1981

Description

@stonebig

date: mid-may (free-threading push)

wanted:

  • pandas-3 everywhere
  • streamlit and numba on free-threading
  • Python-3.14 slim version 100% complete (as "deap" wheel arrived)
  • pylock.toml as the standard way to build with pip, requirement files still published this cycle
  • Python-3.14.5 free-threading complete at 90%
  • Python-3.15.0b1
  • simplifying rc -> final process: rc published as if it will be final.

remark:

  • scientific community effort is on:
    • free-threading stable abi3t for 3.15 beta1
    • numpy-2.5 to be 5% more performant for free-threading than for multi-processing
  • python-3.15 speed-up hopes:
    • lazy imports
    • 10% with tail call for 3.15 windows
    • 10% with JIT and internals
    • 200% with free-threading: 3x for parallelised loads

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