Apply blacken-docs / the black code formatter

[MartinThoma]

Black is becomming the de-facto standard for code formatting in
Python. It makes sure code looks similar in many projects and it
leads to minimal diffs.

[zedr]

Makes sense. Before I merge this, I'll take a look at integrating Black via its API so tests fail if it detects any style errors. Bear with me...

[MartinThoma]

You can add a Github Action by creating .github/workflows/linting.yaml with the content:

name: Lint on: push: branches: [ master ] pull_request: branches: [ master ] jobs: build: runs-on: ubuntu-latest strategy: matrix: python-version: ["3.10"] steps: - uses: actions/checkout@v2 - name: Set up Python ${{matrix.python-version }} uses: actions/setup-python@v2 with: python-version: ${{matrix.python-version }} - name: Install dependencies run: | python -m pip install --upgrade pip python -m pip install blacken-docs - name: Test with blacken-docs run: | blacken-docs . 

However, I'm uncertain if that will give a non-zero exit code when the check is run.