black interface (Sourcery refactored)

[sourcery-ai[bot]]

Pull Request #34 refactored by Sourcery.

If you're happy with these changes, merge this Pull Request using the Squash and merge strategy.

NOTE: As code is pushed to the original Pull Request, Sourcery will re-run and update (force-push) this Pull Request with new refactorings as necessary. If Sourcery finds no refactorings at any point, this Pull Request will be closed automatically.

See our documentation here.

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Review changes via command line

To manually merge these changes, make sure you're on the black_interfaces branch, then run:

git fetch origin sourcery/black_interfaces
git merge --ff-only FETCH_HEAD
git reset HEAD^

Help us improve this pull request!

[github-actions[bot]]

👋 @sourcery-ai[bot] Thanks for creating a PR!

Until this PR is ready for review, you can include the [WIP] tag in its title, or leave it as a github draft.

Please make sure it is compliant with our contributing guidelines. In particular, be sure it checks the boxes listed below.

• [ ] PR has an interpretable title.
• [ ] PR links to Github issue with mention Closes #XXXX (see our documentation on PR structure)
• [ ] Code is PEP8-compliant (see our documentation on coding style)
• [ ] Changelog or what's new entry in doc/changes/latest.rst (see our documentation on PR structure)

For new features:

• [ ] There is at least one unit test per new function / class (see our documentation on testing)
• [ ] The new feature is demoed in at least one relevant example.

For bug fixes:

• [ ] There is at least one test that would fail under the original bug conditions.

We will review it as quick as possible, feel free to ping us with questions if needed.