X-P2P优惠卷

class Coupon:
    def __init__(self, code, discount, expiry_date):
        self.code = code
        self.discount = discount
        self.expiry_date = expiry_date

    def is_valid(self):
        return datetime.now() < self.expiry_date

class User:
    def __init__(self, name):
        self.name = name
        self.coupons = []

    def add_coupon(self, coupon):
        self.coupons.append(coupon)

    def use_coupon(self, coupon_code):
        for coupon in self.coupons:
            if coupon.code == coupon_code and coupon.is_valid():
                print(f"{self.name} used coupon {coupon_code} and got a {coupon.discount}% discount.")
                return True
        print(f"Coupon {coupon_code} is invalid or expired.")
        return False

# 示例使用
user = User("Alice")
coupon = Coupon("SAVE10", 10, datetime(2023, 12, 31))
user.add_coupon(coupon)
user.use_coupon("SAVE10")