Update app.py

app.py

@@ -182,6 +182,18 @@ class ChatHistory(gr.components.Component):
         self.data_summary = ""
         self._current_df = None
 
+    def preprocess(self, payload):
+        """
+        Preprocess the input data before it is passed to the component.
+        """
+        return payload
+
+    def postprocess(self, value):
+        """
+        Postprocess the output data before it is returned from the component.
+        """
+        return value
+
 def analyze_and_visualize(file, message, history, api_key, chat_history):
     """Main function for data analysis with improved state management"""
     if not file and chat_history.current_df is None: