ruff format/check

[clarasb]

This PR includes:

• Formatting changes from ruff format
• Fixes for issues reported by ruff check

Checklist (strike out non-applicable):

• Changes documented in CHANGES.md
• Related issue exists and is referred to in the PR description and CHANGES.md
• Added docstrings and API docs for any new/modified user-facing classes and functions
• Changes/features documented in docs/*
• Unit-tests adapted/added for changes/features
• Test coverage remains or increases (target 100%)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.42%. Comparing base (67492c4) to head (8b1afc5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #75      +/-   ##
==========================================
- Coverage   99.49%   99.42%   -0.07%     
==========================================
  Files          75       75              
  Lines        2967     2975       +8     
  Branches      432      432              
==========================================
+ Hits         2952     2958       +6     
- Misses          0        1       +1     
- Partials       15       16       +1     

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