[{'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:train.country_destination.replace('NDF',0,inplace=True)\ntrain.country_destination.replace('US',1,inplace=True)\ntrain.country_destination.replace('other',2,inplace=True)\ntrain.country_destination.replace('FR',3,inplace=True)\ntrain.country_destination.replace('CA',4,inplace=True)\ntrain.country_destination.replace('GB',5,inplace=True)\ntrain.country_destination.replace('ES',6,inplace=True)\ntrain.country_destination.replace('IT',7,inplace=True)\ntrain.country_destination.replace('PT',8,inplace=True)\ntrain.country_destination.replace('NL',9,inplace=True)\ntrain.country_destination.replace('DE',10,inplace=True)\ntrain.country_destination.replace('AU',11,inplace=True)"}, {'role': 'assistant', 'content': 'data_preprocessing'}]