Remove Python 3.8 support and deprecate usage of 3.9#1334
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Remove Python 3.8 support and deprecate usage of 3.9#1334
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Description
This PR removes Python 3.8 support from the supported build/install matrix and marks Python 3.9 as deprecated.
The work is split into two commits for easier review:
7c6670e262removes Python 3.8 support from packaging metadata, dependency markers, CI minimum-version coverage, CMake minimum-version enforcement, and the build/install documentation.35a58c4d24adds Python 3.9 deprecation messaging with a March 2027 removal date in the install docs, CMake warning text, and release-note snippet.Verification
Validated by:
developgit diff --checkpyproject.tomlwithtomllibto confirmrequires-python = ">=3.9, <3.15"and nocp38wheel targets remain.github/workflows/pull-request.ymlsuccessfullyNo automated tests were added or updated because this PR only changes support policy, CI configuration, packaging metadata, CMake version gating, and documentation. I did not run a full build or test suite.
Documentation
Updated documentation/artifacts:
docs/source/Build/installOnLinux.rstdocs/source/Build/installOnMacOS.rstdocs/source/Build/installOnWindows.rstdocs/source/Build/customPython.rstdocs/source/Support/bskReleaseNotesSnippets/1329-drop-py38-deprecate-py39.rstReviewers should also check:
pyproject.toml.github/workflows/pull-request.ymlsrc/CMakeLists.txtFuture work
After the Python 3.9 deprecation window ends in March 2027, the remaining follow-up should be to remove Python 3.9 support entirely, raise the minimum supported version to Python 3.10, and delete the temporary deprecation warning/path.