Python 3.15.0 Candidate 2 Released
By BIOS Founding Team
Python 3.15.0rc2 shipped as the final testing milestone before the scheduled October 1 general-availability date. Notable items bundled in this release include frozendict and sentinel types, explicit lazy imports, UTF-8 as the default text encoding, and unpacking inside comprehensions.
A JIT compiler gives roughly an 8-9% speedup on x86-64 Linux, and official macOS installers now ship the free-threaded build by default.
Full details: https://blog.python.org/2026/09/python-3150rc2.html
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