python 简易购物系统

def shopping_system():
    money = float(input("请输入购物金额："))
    products = [("牛奶", 5), ("鸡蛋", 20), ("香蕉", 10), ("杯子", 10)]
    shopping_cart = []
    while True:
        print("商品列表如下：")
        for index, product in enumerate(products):
            print(f"{index + 1}. 商品：{product[0]}，价格：{product[1]}")
        choice = input("请输入你要购买的商品编号(退出请按Q/q)：")
        if choice.lower() == "q":
            print("----您的购物清单----")
            for item in shopping_cart:
                print(f"易购商品：{item[0]}，价格：{item[1]}")
            print(f"您的余额为： {money}")
            break
        elif choice.isdigit() and 1 <= int(choice) <= len(products):
            product = products[int(choice) - 1]
            if money >= product[1]:
                shopping_cart.append(product)
                money -= product[1]
                print("购物成功！")
            else:
                print("余额不足！")
        else:
            print("输入错误，请重新输入！")

shopping_system()