[{'role': 'system', 'content': "You are an expert in machine learning and your task is to classify the code snippets into categories from the provided list of categories. List of categories: ['helper_functions', 'load_data', 'data_exploration', 'data_preprocessing', 'evaluation', 'modelling', 'prediction', 'result_visualization', 'save_results', 'comment_only']"}, {'role': 'user', 'content': 'Identify to which category the provided code belongs and assign the code snippet to at least 1 but up to 5 categories based on the probabilities, ignore if the probability of the category is negligible. Strictly provide your response as a list. Avoid providing any additional information, commentary, or personal opinions.\\nPython Code:test_cities = pd.DataFrame(test_loc.Id)<br>test_cities = test_cities.set_index(\'Id\')<br>test_cities[\'city\'] = \'\'<br><br>for index, row in test_loc.iterrows():<br>    row_id = row[\'Id\']<br>    city = row[\'location\'][-2]<br>    if city != \'n\':<br>        test_cities.at[row_id, \'city\'] = city.lstrip(\' \')<br><br>test_cities.to_csv("test_cities.csv", index=False)'}, {'role': 'assistant', 'content': "['save_results']"}]