chore: drop support for Python 3.7-3.9#2770
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This pull request drops support for Python 3.7, 3.8, and 3.9, raising the minimum supported Python version to 3.10 across configuration files, documentation, setup scripts, and tests. It also updates issue/PR assignment configurations and modernizes GCS copy commands in Kokoro scripts. The reviewer feedback highlights obsolete notes in CONTRIBUTING.rst regarding older Python 3 versions and Python 2 compatibility that should be removed or updated.
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| System tests are only configured to run under Python 3.8. | ||
| System tests are only configured to run under Python 3.10. |
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Since Python 3.10 is now the minimum supported version, the note on the following line ('For expediency, we do not run them in older versions of Python 3.') is obsolete because there are no older supported versions of Python 3. Consider removing or updating that sentence to avoid confusion.
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| We also explicitly decided to support Python 3 beginning with version 3.7. | ||
| We also explicitly decided to support Python 3 beginning with version 3.10. |
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Since the minimum supported Python version is now 3.10, the reasons listed below (specifically the third bullet point regarding Unicode literal support for Python 2 and Python 3 compatibility) are obsolete and no longer applicable. Consider removing or updating that bullet point to reflect modern Python 3.10+ features.
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Drop support for Python 3.7. 3.8, and 3.9.
Fixes: #2769