chore: drop Python 3.9 support (EOL) - #114
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requires-python >= 3.10: cp39 wheels are no longer built (--find-interpreter honors the floor) and pip refuses new releases on 3.9. README support tables and prerequisites updated. Python 3.10 (security-supported until 2026-10) through 3.14 remain supported; the aarch64 CI test container (ubuntu 22.04) runs system Python 3.10, so 3.10's own drop is deferred to its October EOL. Co-Authored-By: Claude
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Drops support for Python 3.9, which reached end-of-life on 2025-10-31 and no longer receives security fixes.
What changes
requires-pythonmoves from>=3.9to>=3.10. This is the load-bearing change: the CI wheel builds use--find-interpreter, which honors this floor, so cp39 wheels stop being built, and pip refuses to install new cedarpy releases on Python 3.9. Existing published releases remain installable.3.10 - 3.14, prerequisites updated, and the Developing section's commands and example transcript re-tested and refreshed on Python 3.11 (venv-activation step added; transcript now reflects current maturin/pytest output).Removedentry under[Unreleased].Python 3.10 is deliberately kept
3.10 is security-supported until October 2026. Its own drop is deferred to that EOL, and has a CI dependency to plan for: the aarch64 test container is Ubuntu 22.04, whose system Python is 3.10 — dropping 3.10 means moving that job to a newer container.
Verification
218 unit tests pass on the branch. No
3.9references remain in the repo (the README's example transcript was re-tested and refreshed on Python 3.11). CI needs no change: wheel selection is driven by--find-interpreterfiltering againstrequires-python, so the cp39 wheel drop follows frompyproject.tomlautomatically — expect this PR's wheel artifacts to show cp310-cp314.🤖 Generated with Claude Code