Python 3.15: Lazy Imports, frozendict, and Faster Startup
Python 3.15 lands lazy imports, a frozendict builtin, unpacking in comprehensions, and the Tachyon sampling profiler. Here's what changed and what to test.
Free-Threading
Python 3.14 Free-Threading: Real Benchmarks, Real Breakage, Real Code
Python 3.14's free-threaded build is officially supported. Published benchmarks show ~3x speedups on 4 threads; which libraries break, how to install it.