[{'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:df6.drop(["rtemp3","month"],axis=1,inplace=True)\nd=pd.read_csv("../input/train.csv")\ndf6["temp"]=d["temp"]\nvar=["holiday","workingday","weekend","hours"]\nfor v in var:\n    df6[v]=df6[v].astype("category")\n'}, {'role': 'assistant', 'content': 'data_preprocessing'}]