[{'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:avg1 = 'avg20d'\navg2 = 'avg60d'\nsd = SingleStockDaily\ndf = pd.read_sql(session.query(sd.openingprice,sd.closingtprice,sd.avg5d,sd.avg10d,sd.avg20d,sd.avg60d,sd.tradeDate,sd.tradeVolume)\\\n.order_by(sd.tradeDate).filter(sd.stockid=='1215').statement, session.bind)\ndf1 = df.copy()\ndf1.index = range(0,len(df1))\ndf1.plot(x='tradeDate',y=[avg1,avg2,'closingtprice'])\ndf1.plot(y=['tradeVolume'],kind='bar')"}, {'role': 'assistant', 'content': 'data_exploration'}]