Improve code style

app.py

@@ -56,11 +56,11 @@ def byid(mid):
     if mid not in movie_titles:
         abort(404)
 
-    title, year = movie_titles[mid]
+    res_title, res_year = movie_titles[mid]
     return {
         "id": mid,
-        "title": title,
-        "year": year
+        "title": res_title,
+        "year": res_year
     }
 
 @app.route("/titles/healthz")