reapplied old black to fix issues with 3.7 #280

	name: tests

	on: [push, pull_request]

	jobs:
	build:

	runs-on: ubuntu-20.04
	strategy:
	matrix:
	python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]

	steps:
	- uses: actions/checkout@v3

	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}

	- name: main python version - 3.9
	if: ${{ matrix.python-version == '3.9' }}
	run: \|
	pip install -r ci-requirements/py3.9-lint-doc-build/requirements.txt
	pip install -e .
	# stop the build if there are Python syntax errors or undefined names
	flake8 src tests --count --select=E9,F63,F7,F82 --show-source --statistics
	# stop the build if there is something black can fix
	black src tests --check
	isort src tests --check
	mypy --check-untyped-defs src
	pytest --benchmark-skip
	bash <(curl -s https://codecov.io/bash) -t ${{ secrets.CODECOV_TOKEN }}

	- name: other python versions
	if: ${{ matrix.python-version != '3.9' }}
	run: \|
	pip install -r ci-requirements/py${{ matrix.python-version }}/requirements.txt
	pip install -e .
	pytest --benchmark-skip

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