[{'role': 'system', 'content': "You are an expert in machine learning and your task is to classify code snippets into one of the following categories: ['helper_functions', 'load_data', 'data_exploration', 'data_preprocessing', 'evaluation', 'modelling', 'prediction', 'result_visualization', 'save_results', 'comment_only']."}, {'role': 'user', 'content': "Identify the single most appropriate category to which the provided code belongs. Provide your response as a single category label without any additional information, commentary, or personal opinions.\\nPython Code:details_data = xw.Range('it_sys_details', 'B11').table.value\ndetails_df = pd.DataFrame(data=details_data[1:], columns=details_data[0])\ndetails_df = details_df[['client_number','Warehouse Mgmt System', 'Transportation Mgmt System']]\ndetails_df = details_df[(details_df['Warehouse Mgmt System'] != '')&(details_df['Transportation Mgmt System'] != '')]"}, {'role': 'assistant', 'content': 'data_preprocessing'}]