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why: CPython 3.15.0 was released on 2026-10-09 and is past the 3-day release cooldown. mise resolves the bare `3.15` to the newest installed 3.15.x, so the pin needs no patch bumps. mise and uv now default to Python 3.15.0 here, with 3.14 through 3.10 kept as further entries. See also: - https://www.python.org/downloads/release/python-3150/ - https://docs.python.org/3.15/whatsnew/3.15.html
why: uv's default interpreter for `uv sync` and `uv run` is now Python 3.15. See also: - https://docs.python.org/3.15/whatsnew/3.15.html
why: The test job in tests.yml ran only Python 3.14; 3.15 replaces it. The suite does not pass on 3.15 yet: `uv run py.test` fails about 110 tests because argparse in 3.15 defines its own `_theme` property on `HelpFormatter`, which `TmuxpHelpFormatter._theme` shadows. This commit shows that failure in CI. See also: https://devguide.python.org/versions/
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Summary
Makes Python 3.15 the default interpreter and the version the CI test job runs. CI on 3.15 is expected to fail until the linked issue is fixed:
argparsein 3.15 collides withTmuxpHelpFormatter._theme, sotmuxpfails while building its parser.Changes
.tool-versions:python 3.15 3.14 3.13 3.12 3.11 3.10, with 3.15 first..python-version:3.14to3.15..github/workflows/tests.yml: the test matrix runs3.15in place of3.14. The release job is unchanged.Refs #1094
Testing
$ env -u GOOGLE_API_KEY uv run py.testOn Python 3.15.0 this reports 110 failed, 796 passed, 2 skipped; the failures are
AttributeError: 'NoneType' object has no attribute 'reset'fromargparse. On Python 3.14 the same command reports 906 passed, 2 skipped.