Fix minor issues #186

	# This workflow will install Python dependencies, run tests and lint with a single version of Python
	# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions

	name: Python application

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	jobs:
	build:

	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v2
	- name: Cache
	uses: actions/cache@v2.1.7
	with:
	path: ~/.cache/pip
	key: ${{ runner.os }}-pip-${{ hashFiles('**/flake8_requirements.txt') }}
	restore-keys: \|
	${{ runner.os }}-pip-

	- name: Lines of codes
	run: \|
	find . -name '*.py' \| xargs wc -l

	- name: Set up Python 3.10
	uses: actions/setup-python@v2
	with:
	python-version: "3.10"

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install flake8
	if [ -f flake8_requirements.txt ]; then pip install -r flake8_requirements.txt; fi

	- name: Lint with flake8
	run: \|
	# stop the build if there are Python syntax errors or undefined names
	# exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide, but we are ok with 150
	flake8 . --count --select E9,F63,F7,F82 --ignore E203,F --show-source --exit-zero --max-complexity 35 --max-line-length 150 --statistics

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