Update pages/python.py

pages/python.py

@@ -66,7 +66,7 @@ if submit and user_input:
     result = deep_seek.invoke(messages)
 
     # Append to history
-    st.session_state.chat_history.append((user_input, result.content))
+    st.session_state[PAGE_KEY].append((user_input, result.content))
 
 # --- Display Chat History ---
 st.subheader("🗨️ Chat History")