changed prompt

python_code_executor_service.py

@@ -185,7 +185,9 @@ class PythonExecutor:
     def _format_result(self, result: Any) -> str:
         """Format the result for display"""
         if isinstance(result, (pd.DataFrame, pd.Series)):
-            return str(result)
+          # Convert DataFrame to a string, then to a list of dicts (handles NumPy types)
+          json_str = result.to_json(orient='records', date_format='iso')
+          json.dumps(json.loads(json_str), indent=2)  # Re-parse for pretty formatting
         elif isinstance(result, (dict, list)):
             return json.dumps(result, indent=2)
         return str(result)