product_list = [[‘Iphone7‘,5800],                #列表方式
                [‘Coffee‘,30],
                [‘疙瘩汤‘,10],
                [‘Python Book‘,99],
                [‘Bike‘,199],
                [‘ViVo X9‘,2499],

                ]

shopping_cart = []                 #shopping_cart        购物车

salary = int(input("input your salary:"))               #请输入你的资产
while True:
    index = 0
    for product in product_list:
        print(index,product)
        index += 1
    choice = input(">>:").strip()
    if choice.isdigit():   #判断是否为数字
        choice = int(choice)
        if choice >= 0 and choice < len(product_list):    #商品存在
            product = product_list[choice]    #取到商品
            if product[1] <= salary:    #判断是否买得起
                #买得起
                shopping_cart.append(product)   #加入购物车
                salary -= product[1]  #扣钱
                print("Added product" + product[0] + "into shopping cart,your current balance")
            else:
                print("买不起，穷逼！产品价格是" + str(product[1]) + "你还差" + str(product[1] - salary) + "￥")
        else:
            print("商品不存在！")
    elif choice == "q":
        print("------已购买商品列表------")
        for i in shopping_cart:
            print(i)
            print("您的余额为:",salary)
            print("-----End-----")
            break
        else:
            print("无此选项!")