[{'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:weather_df=pd.get_dummies(train_df['weather'],prefix='weather')\nyr_df=pd.get_dummies(train_df['year'],prefix='year')\nmonth_df=pd.get_dummies(train_df['month'],prefix='month')\nhour_df=pd.get_dummies(train_df['hour'],prefix='hour')\nseason_df=pd.get_dummies(train_df['season'],prefix='season')\ntrain_df=train_df.join(weather_df)\ntrain_df=train_df.join(yr_df)\ntrain_df=train_df.join(month_df)                     \ntrain_df=train_df.join(hour_df)\ntrain_df=train_df.join(season_df)\n                     \nweather_df=pd.get_dummies(test_df['weather'],prefix='weather')\nyr_df=pd.get_dummies(test_df['year'],prefix='year')\nmonth_df=pd.get_dummies(test_df['month'],prefix='month')\nhour_df=pd.get_dummies(test_df['hour'],prefix='hour')\nseason_df=pd.get_dummies(test_df['season'],prefix='season')\ntest_df=test_df.join(weather_df)\ntest_df=test_df.join(yr_df)\ntest_df=test_df.join(month_df)                     \ntest_df=test_df.join(hour_df)\ntest_df=test_df.join(season_df)"}, {'role': 'assistant', 'content': 'data_preprocessing'}]