# _Author:huang
#  date: 2017/11/26

# 简单的购物车程序
money = input("money:")

product_list = [
    ("Mac", 9000),
    ("Kindle", 300),
    ("Tesla", 8000),
    ("book", 60),
    ("bike", 400)
]

shopping_car = []

if money.isdigit():
    money = int(money)

    while True:
        for i, v in enumerate(product_list, 1):
            print(i, '>>>', v)
        choice = input("请输入商品编号：[退出：q]：")
        if choice.isdigit():
            choice = int(choice)
            if choice >= 0 and choice <= len(product_list):
                p_item = product_list[choice-1]
                if p_item[1] < money:
                    money -= p_item[1]
                    shopping_car.append(p_item)
                    print(p_item)
                else:
                    print("余额为%s,余额不足"% money)
            else:
                print("编码不存在！")
        elif choice == 'q':
            print("-----你后买的商品如下----")
            for i in shopping_car:
                print(i)
            print("你的余额为：%s"% money)
            break
        else:
            print("无效输入")

else:
    print("Invialue number")