Modify get_color_list() to conform to flake8 E731

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.22%. Comparing base (af7d326) to head (dd5667e).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #118 +/- ## ======================================= Coverage 99.22% 99.22% ======================================= Files 12 12 Lines 773 774 +1 ======================================= + Hits 767 768 +1 Misses 6 6 ```

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