购物车程序

   

__author__ = 'xitaozi'
'''
使用列表实现购物车
'''
produce_list = [
    ('Macbook pro 15.4',14288),
    ('Think pad X1 carbon',10000),
    ('HP WASD',7000),
    ('Dell xps 13',8000)
]

while True:
    budget = input("请输入购物预算：")
    shopping_list = []
    if budget.isdigit():
        budget = int(budget)
        while True:
            for (item,product) in enumerate(produce_list):
                print(item,product)
            user_choice = input("选择商品编号，加入购物车。输入字母'Q'退出")
            if user_choice.isdigit():
                user_choice = int(user_choice)
                if user_choice < len(produce_list) and user_choice >= 0:
                    p_item = produce_list[user_choice]
                    if p_item[1] <= budget:
                        shopping_list.append(p_item)
                        budget = budget - p_item[1]
                        print("加入%s购物车成功，您的预算余额为：%d。"%(p_item,budget))
                    else:
                        print("您的预算余额为：%d，无法继续购买。"%budget)
                else:
                    print("商品编号输入错误，请重新输入。")
            elif user_choice == 'Q'or user_choice == 'q':
                print("--------您的购物车有如下商品--------")
                for shop_item in shopping_list:
                    print(shop_item)
                exit()
            else:
                print("输入错误")
    else:
        print("输入错误,请重新运行程序。")