Python 3.15.0 Release Candidate 3
By BIOS Founding Team
This was the last planned release candidate, with about 156 fixes from 82 contributors since rc2. It was added because late lazy-import release blockers were found, which moved the final release from October 1 to October 9.
The post asks maintainers to publish 3.15 wheels, and warns that IDLE and tkinter apps may hang on macOS 27.0.
Full details: https://blog.python.org/2026/10/python-3150-rc3
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