[{'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:postcode_lookup = pd.read_csv(os.path.join(data_dir, \'Extra\', "Australian_Post_Codes_Lat_Lon.csv"), index_col=0)\ndef get_latlon(postcode):\n"""\nThe same postcode can be used for multiple localities, so we need to check.\n"""\ntry:\nrslt = postcode_lookup.xs(postcode)\nexcept KeyError:\nprint("Postcode {} not found".format(postcode))\nreturn None, None\nif np.isscalar(rslt.lat):\nlat = rslt.lat\nlon = rslt.lon\nelse:\nlat = rslt.lat.iloc[0]\nlon = rslt.lon.iloc[0]\nreturn lat, lon'}, {'role': 'assistant', 'content': 'load_data'}]