企业用车服务系统促销活动

class Coupon:
    def __init__(self, code, discount_amount):
        self.code = code
        self.discount_amount = discount_amount
        self.used = False

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

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

    def use_coupon(self, code):
        for coupon in self.coupons:
            if coupon.code == code and not coupon.used:
                coupon.used = True
                return f"{self.name} used coupon {code} and got a discount of {coupon.discount_amount}."
        return f"Coupon {code} not found or already used."

# 示例使用
user1 = User("Alice")
coupon1 = Coupon("SAVE10", 10)
user1.add_coupon(coupon1)

print(user1.use_coupon("SAVE10"))  # 输出: Alice used coupon SAVE10 and got a discount of 10.
print(user1.use_coupon("SAVE10"))  # 输出: Coupon SAVE10 not found or already used.