python基础之作业1----购物车小练习

product_list = [
    ("Iphone",6000),
    ("Mac pro",12800),
    ("Bike",600),
    ("Watch",8000),
    ("Book",24),
    ("?offee",35),
]
shopping_list = ()
salary = (input("请输入您的购物款：  "))
if salary.isdigit():  # 判断输入的值是否为数值，是的话继续
    salary = int(salary)

while True:
        for item in product_list:
            print(product_list.index(item),item) # 打印列表的下标及列表

user_choice = input("请输入您想要购买的物品编号：")
        if user_choice.isdigit():
            user_choice = int(user_choice)

print("输入错误，请重新输入")
            if user_choice <= len(product_list) and user_choice >= 0:
                p_item = product_list[user_choice]
                if p_item[1] <= salary: #能够支付
                  shopping_list.append(p_item)  # 调用不到.append，也是醉了
                  salary -= p_item[1]
                  print("您购买的商品  %s  购买成功,余额还剩余%s"%(p_item[0],salary))

else:
                    print("余额不足，无法购买，请重新选择吧!")

elif user_choice == "退出":
            print("退出成功，欢迎下次再来")
            print("----info of shoppint_list")
            for p in shopping_list:
                print(p)

print("您的余额还剩余",salary)
            print(shopping_list)
            exit()

else:
            print("输入值错误，请重新输入")

print()