Python小代码_3_购物车

product_list = [
    ('MacBook', 9000),
    ('kindle', 500),
    ('tesla', 900000),
    ('book', 100),
    ('bike', 2000),
]

saving = input("please input your money:")
shopping_car = []

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

    while True:
        #打印商品内容
        for i, v in enumerate(product_list, 1):
            print(i, ">>>", v)

        #引导用户选择商品
        choice = input("choose goods that you want to buy[exit:q]:")

        #验证输入是否合法
        if choice.isdigit():
            choice = int(choice)
            if choice > 0 and choice <= len(product_list):

                #将用户选择商品通过choice选出
                p_item = product_list[choice - 1]

                #如果钱足够，用saving减去商品价格，并将该商品加入购物车
                if p_item[1] <= saving:
                    saving -= p_item[1]
                    shopping_car.append(p_item)

                else:
                    print("-----------------")
                    print("Sorry, your balance is not enough.")
                    print("Your balance: " + str(saving))
                    print("-----------------")
                    continue
                print("-----------------")
                print("You have chose " + p_item[0])
                print("Your balance: " + str(saving))
                print("-----------------")
            else:
                print("Non existent")
        elif choice == 'q':
            print("---------------")
            print("You have chose the following goods:")
            print("Goods		number	Price")

            num = 1
            #循环遍历购物车里面的商品，购物车存放的是已买商品
            for i in shopping_car:
                print(i[0] + "		" + str(num) + "		" + str(i[1]))
            print()
            print("balance :", saving)
            print("---------------")
            break

        else:
            print("invalid input")