Update app.py

app.py

@@ -243,35 +243,35 @@ def run_entity_exploration():
         if class_entities:
             entities.extend(class_entities)
 
-    # Remove duplicates and sort
     entities = sorted(set(entities))
 
-    # Debug: print full entity list and their types
+    # Debug info
     st.write("Loaded entities:", entities)
     st.write("Ontology classes:", ontology_manager.get_classes())
     for node, attr in ontology_manager.graph.nodes(data=True):
         if attr.get("type") == "instance":
             st.write("Found instance:", node, "of class:", attr.get("class_type"))
 
+    selected_entity = None  # <-- 安全宣告，避免未定義錯誤
+
     if entities:
         selected_entity = st.selectbox("Select Entity", entities)
 
-        if selected_entity:
-            entity_info = ontology_manager.get_entity_info(selected_entity)
-            display_entity_details(entity_info, ontology_manager)
+    if selected_entity:
+        entity_info = ontology_manager.get_entity_info(selected_entity)
+        display_entity_details(entity_info, ontology_manager)
 
-            if st.button("View this Entity in the Knowledge Graph"):
-                st.session_state.central_entity = selected_entity
-                st.rerun()
+        if st.button("View this Entity in the Knowledge Graph"):
+            st.session_state.central_entity = selected_entity
+            st.rerun()
 
-            st.subheader("Entity Neighborhood")
-            max_distance = st.slider("Maximum Neighborhood Distance", 1, 3, 1)
-            neighborhood = knowledge_graph.get_entity_neighborhood(
-                selected_entity,
-                max_distance=max_distance,
-                include_classes=True
-            )
-            # Optional: visualize neighborhood or print debug info
+        st.subheader("Entity Neighborhood")
+        max_distance = st.slider("Maximum Neighborhood Distance", 1, 3, 1)
+        neighborhood = knowledge_graph.get_entity_neighborhood(
+            selected_entity,
+            max_distance=max_distance,
+            include_classes=True
+        )
     else:
         st.warning("No entities found in the ontology.")