fix(api-core): drop support for Python 3.9#16980

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chalmerlowe wants to merge 15 commits intomainfrom

feat/drop-python-3.7-3.9-google-api-core

Commits on May 7, 2026

feat(api-core): update pyproject.toml to require Python 3.10+
chalmerlowe
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docs(api-core): update README for Python 3.10+ support
chalmerlowe
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test(api-core): remove Python < 3.10 polyfills and skips
chalmerlowe
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docs(api-core): update docstring in grpc_helpers_async.py for Python 3.10+
chalmerlowe
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chore(api-core): remove Python 3.9 from Nox sessions
chalmerlowe
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docs(api-core): update CONTRIBUTING.rst examples to use Python 3.10
chalmerlowe
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chore(api-core): use match statement in noxfile.py
chalmerlowe
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refactor(api-core): remove Python < 3.10 polyfill in _python_version_support.py
chalmerlowe
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docs(api-core): update example Python version in client_info.py
chalmerlowe
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refactor(api-core): remove Python 3.9 from tracked versions list
chalmerlowe
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docs(api-core): update example Python version in gapic_v1/client_info.py
chalmerlowe
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test(api-core): update tests to use Python 3.10 instead of 3.9
chalmerlowe
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chore(api-core): apply black formatting
chalmerlowe
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chore(api-core): apply manual updates and add 3.10 constraints files
chalmerlowe
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