CI: add CPython 3.15 and 3.15t wheel builds - #346
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Add CPython 3.15 and free-threaded 3.15 wheel builds, and advertise Python 3.15 in the package classifiers. Keep cp314t in the matrix. cibuildwheel 4.2.0 includes ABI-stable CPython 3.15.0rc1 builders and builds 3.14+ free-threaded interpreters without the removed cpython-freethreading opt-in. cp313t is no longer produced for new releases. It was an experimental transition build; manylinux and cibuildwheel have removed its builder, and current ecosystem matrices such as SciPy have moved to cp314t+. Existing published cp313t wheels remain available, and this does not add a source-level rejection of Python 3.13t.
Document that stateless operations and separate frame contexts may run concurrently, while incremental frame and stream contexts require caller-side serialization. Add a barrier-based regression test for concurrent independent frame contexts.
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Summary
cpython-freethreadingopt-incp313t release boundary
cp313tis deliberately no longer produced for new releases. CPython 3.13t was an experimental transition build; manylinux and cibuildwheel have removed its builder, and current ecosystem matrices such as SciPy have moved tocp314t+. Existing published cp313t wheels remain available, and this change does not add a source-level rejection of Python 3.13t.Validation
Validated on 10.2 using
/optPython 3.14.7t, 3.15.0b3, and 3.15.0rc1t:pytest-run-parallel/opt/python314tthrough pytest and under both/opt/python314tand/opt/python315tas a direct isolated runThe GitHub Actions matrix remains the acceptance gate for manylinux repair and macOS, Windows, i686, and aarch64 wheels.
Release request
After CI is green and this is merged, please create a new release/tag to trigger the existing PyPI publish job. PyPI 4.4.5 predates the already-merged cp314t work, and this PR adds cp315/cp315t; without a new release, users cannot install these wheels from PyPI.