[{'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:df_StoreType = pd.get_dummies(df_store.StoreType, prefix=\'StoreType_\')\ndf_Assortment = pd.get_dummies(df_store.Assortment, prefix=\'Assortment_\')\ndf_store = pd.concat([df_store, df_StoreType, df_Assortment], axis=1)\ndel df_store["StoreType"]\ndel df_store["Assortment"]\ndel df_store["PromoInterval"]\''}, {'role': 'assistant', 'content': 'data_preprocessing'}]