问题遇到的现象和发生背景
这段代码是怎么做到计算回购率的。有关set 和 intersection的函数有些看不明白。、
明明online_retail_end_customer没有被用到呀啊。怎么计算交值。
问题相关代码,请勿粘贴截图
start_customer_usernum = len(online_retail_start_customer)
end_customer_usernum = len(set(online_retail_start_customer).intersection(set(online_retail_end_customer)))
customer_retention_rate = end_customer_usernum / start_customer_usernum