Cleanup unused imports and variables in backends #22502
Merged
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PR Summary
Remove unused imports and local variables.
I split some import lines into two: one with the used and one with the unused. In this way, tools will warn if any previously used import becomes unused.
PR Checklist
Tests and Styling
pytest
passes).flake8-docstrings
and runflake8 --docstring-convention=all
).Documentation
doc/users/next_whats_new/
(follow instructions in README.rst there).doc/api/next_api_changes/
(follow instructions in README.rst there).