Update app.py

app.py

@@ -93,7 +93,7 @@ def app():
       for sub_graph in marvel_file["children"]:
         marvel_store.add_triple(marvel_file["name"], "has_subgroup", sub_graph["name"], picture=marvel_file["img"])
         for node in sub_graph["children"]:
-          node1 = node["hero"]
+          node1 = node["role"]
           link = "blongs_to"
           node2 = sub_graph["name"]
           pic = node["img"]