refactor: apply bugbears linting checks

[kenibrewer]

Description

Should be merged after #386

This applies the bugbear set of linting checks and makes appropriate fixes. The most commonly addressed linting failure that was fixed in this PR is B006. In cases where the mutable default was a list, it was replaces with an immutable tuple instead. For mutable dictionaries, the fix instead involved setting the default to None and initializing the default within the function.

What is the nature of your change?

• Bug fix (fixes an issue).
• Enhancement (adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• This change requires a documentation update.

Checklist

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• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• New and existing unit tests pass locally with my changes.
• I have added tests that prove my fix is effective or that my feature works.
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