智慧建筑操作系统优惠卷

class Coupon:
    def __init__(self, code, discount_type, value, expiration_date):
        self.code = code
        self.discount_type = discount_type  # 'percentage' or 'amount'
        self.value = value
        self.expiration_date = expiration_date

    def is_valid(self, current_date):
        return current_date <= self.expiration_date

    def apply_discount(self, original_price):
        if self.discount_type == 'percentage':
            return original_price * (1 - self.value / 100)
        elif self.discount_type == 'amount':
            return max(0, original_price - self.value)
        return original_price

# 示例使用
current_date = datetime.date.today()
coupon = Coupon(code="SAVE20", discount_type='percentage', value=20, expiration_date=datetime.date(2023, 12, 31))

if coupon.is_valid(current_date):
    final_price = coupon.apply_discount(100)
    print(f"Final price after discount: {final_price}")
else:
    print("Coupon has expired.")