PR #552 + black all files #186

	# As per the example on https://help.github.com/en/actions/language-and-framework-guides/using-python-with-github-actions
	name: Python codestyling
	on: [push, pull_request]

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: ['3.7', '3.8', '3.9', '3.10']
	steps:
	- uses: actions/checkout@v2
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v1
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install -r requirements.txt
	- name: Lint with flake8
	run: \|
	pip install flake8
	# stop the build if there are code styling problems. The GitHub editor is 127 chars wide.
	flake8 . --count --max-line-length=127 --show-source --statistics

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