[{'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['Quarantine'] = 0\ntrain['Schools'] = 0\ntrain['Restrictions'] = 0\n\ntrain.loc[(train['Date'] >= '2020-03-20') &(train.Country_Region == 'Argentina'), 'Quarantine' ] = 1\ntrain.loc[(train['Date'] >= '2020-03-16') &(train.Country_Region == 'Austria'), 'Quarantine' ] = 1\ntrain.loc[(train['Date'] >= '2020-03-18') &(train.Country_Region == 'Belgium'), 'Quarantine' ] = 1\ntrain.loc[(train['Date'] >= '2020-01-24') &(train.Country_Region == 'China'), 'Quarantine' ] = 1\ntrain.loc[(train['Date'] >= '2020-03-25') &(train.Country_Region == 'Colombia'), 'Quarantine' ] = 1\ntrain.loc[(train['Date'] >= '2020-03-16') &(train.Country_Region == 'Denmark'), 'Quarantine' ] = 1\ntrain.loc[(train['Date'] >= '2020-03-17') &(train.Country_Region == 'France'), 'Quarantine' ] = 1\ntrain.loc[(train['Date'] >= '2020-03-21') &(train.Country_Region == 'Germany'), 'Quarantine' ] = 1\ntrain.loc[(train['Date'] >= '2020-03-23') &(train.Country_Region == 'India'), 'Quarantine' ] = 1\ntrain.loc[(train['Date'] >= '2020-03-19') &(train.Country_Region == 'Israel'), 'Quarantine' ] = 1\ntrain.loc[(train['Date'] >= '2020-03-08') &(train.Country_Region == 'Italy'), 'Quarantine' ] = 1\ntrain.loc[(train['Date'] >= '2020-03-18') &(train.Country_Region == 'Malaysia'), 'Quarantine' ] = 1\ntrain.loc[(train['Date'] >= '2020-03-23') &(train.Country_Region == 'New Zealand'), 'Quarantine' ] = 1\ntrain.loc[(train['Date'] >= '2020-03-15') &(train.Country_Region == 'Peru'), 'Quarantine' ] = 1\ntrain.loc[(train['Date'] >= '2020-03-15') &(train.Country_Region == 'Spain'), 'Quarantine' ] = 1\n\ntrain.loc[(train['Date'] >= '2020-03-19') &(train.Country_Region == 'Israel'), 'Schools' ] = 1\n\ntrain.loc[(train['Date'] >= '2020-03-19') &(train.Country_Region == 'Israel'), 'Restrictions' ] = 1\n\ntrain.drop(['Quarantine_date', 'Schools_date', 'Restrictions_date'], axis = 1, inplace = True)"}, {'role': 'assistant', 'content': 'data_preprocessing'}]