[{'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:# Extract hours from datetime\ndata['datetime'] = pd.to_datetime(data['datetime'])\ndata['hour'] = data['datetime'].dt.hour\ndata['month'] = data['datetime'].dt.month\n\ntest['datetime'] = pd.to_datetime(test['datetime'])\ntest['hour'] = data['datetime'].dt.hour\ntest['month'] = data['datetime'].dt.month\n\ndata['season'] = data.season.astype('category')\ndata['month'] = data.month.astype('category')\ndata['hour'] = data.hour.astype('category')\ndata['holiday'] = data.holiday.astype('category')\ndata['workingday'] = data.workingday.astype('category')\ndata['weather'] = data.weather.astype('category')\n\n\ntest['season'] = test.season.astype('category')\ntest['month'] = test.month.astype('category')\ntest['hour'] = test.hour.astype('category')\ntest['holiday'] = test.holiday.astype('category')\ntest['workingday'] = test.workingday.astype('category')\ntest['weather'] = test.weather.astype('category')\n\n\ndata.dtypes"}, {'role': 'assistant', 'content': 'data_preprocessing'}]