Introduce linter (flake8)

.github/workflows/lint.yml

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+name: Lint with flake8
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Python 3.10
+      uses: actions/setup-python@v3
+      with:
+        python-version: 3.10
+    - name: Install dependencies
+      run: |
+        python -m pip install flake8
+    - name: Lint with flake8
+      run: |
+        make lint

Makefile

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+# Lint requirements: flake8, autopep8, autoflake
+# Run `python -m pip install autopep8 flake8 autoflake` to install them
+
+.PHONY: lint
+lint:
+	flake8 ./ --exclude .venv,*_pb2.py --max-line-length=150 --ignore=F403,F405,F541
+
+.PHONY: format
+format:
+	autopep8 --in-place --aggressive --aggressive --recursive ./ --exclude .venv,*_pb2.py --max-line-length=150
+	autoflake --in-place --recursive --remove-all-unused-imports --remove-unused-variables ./ --exclude .venv