Add PEP8 compliance check #1

	name: Python
	on: [push, workflow_dispatch, pull_request]
	jobs:
	test:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: [3.8, 3.9]
	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
	pip install antlr4-python3-runtime==4.9.1
	- name: Run all the Python tests
	run: python3 tests/test_all.py
	pep8:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@master
	with:
Check failure on line 25 in .github/workflows/python.yml View workflow run for this annotation GitHub Actions / Python Invalid workflow file `The workflow is not valid. .github/workflows/python.yml (Line: 25, Col: 14): Unexpected value '' .github/workflows/python.yml (Line: 26, Col: 9): Unexpected value 'ref'`
	ref: ${{ github.event.pull_request.head.sha }}
	- name: 'Run PEP8 check'
	uses: quentinguidee/pep8-action@v1
	with:
	arguments: '--ignore=E121,E123,E126,E133,E226,E241,E242,E704,W503,W504,W505,W191'

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