#_author:"Jack Ma" #date: 2017/11/12 Goods_list = [     ("xiaomi note 3",2500),     ("xiaomi pro",7000),     ("xiaomi hands",150),     ("xiaomi eraphone",120),     ("xiaomi notebooks",50) ] shopping_list = [] salary = input("请输入您的工资：") if salary.isdigit():     salary = int(salary)     while True:         for index,item in enumerate(Goods_list,1):             print(index,item)         choicegoods = input("请输入您选择的商品编号：")         if choicegoods.isdigit():             choicegoods = int(choicegoods)             if choicegoods < len(Goods_list) and choicegoods >= 0 :                 p_item = Goods_list[choicegoods - 1]                 if p_item[1] < salary:                     salary -= p_item[1]                     shopping_list.append(p_item)                     print("已将%s放入您的购物车，余额为:%s"%(p_item,salary))                 else:                     print("您的余额不足，还剩%s"%salary)             else:                 print("您输入的编号不存在！")         elif choicegoods == 'quit':             print("--------您购买的商品如下-------")             print("商品名           单价")             for item in shopping_list:                  print(item)             print("您还剩%s元钱！"%salary)             print("欢迎您下次光临！")             break else:     print("请输入您的工资：")