Improves code PEP8 compliance and adds ruff check

.github/workflows/ruff.yml

@@ -0,0 +1,21 @@
+name: Ruff
+on: [push]
+
+jobs:
+  ruff_py3:
+    name: Ruff syntax check
+    runs-on: ubuntu-latest
+    steps:
+      - name: Setup Python
+        uses: actions/setup-python@v1
+        with:
+          python-version: 3.9
+          architecture: x64
+      - name: Checkout
+        uses: actions/checkout@master
+      - name: Install Dependencies
+        run: |
+          pip install ruff
+      - name: ruff
+        run: |
+          ruff check .