摘要：
import pandas as pdimport pprintimport numpy as npusers = ['user1','user2','user3','user4','user5',]items = ['item A','item B','item C','item D','item 阅读全文
摘要：
import pandas as pd import pprint import numpy as np users = ['user1','user2','user3','user4','user5',] items = ['item A','item B','item C','item D',' 阅读全文
摘要：
import pandas as pdimport numpy as npusers = ['user1','user2','user3','user4','user5',]items = ['item A','item B','item C','item D','item E',]datasets 阅读全文