add code style checking

.github/workflows/style.yml

@@ -0,0 +1,36 @@
+name: Code Style
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+
+jobs:
+  isort:
+    name: isort
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: 3.12
+      - name: Install Dependencies
+        run: pip3 install isort
+      - name: Run isort
+        run: 'isort --check service *.py'
+  black:
+    name: black
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: 3.12
+      - name: Install Dependencies
+        run: pip3 install black
+      - name: Run black
+        run: 'black --check service *.py'

hafas_event.py

@@ -148,7 +148,7 @@ def notes(self):
             if note["type"].upper() in ("R",):
                 notes.append(note["value"])
         if notes:
-            return '  |  '.join(notes)
+            return "  |  ".join(notes)
         return None
 
     @property