智能会议 代金卷

class Voucher:
    def __init__(self, code, amount, valid_until, service_type):
        self.code = code
        self.amount = amount
        self.valid_until = valid_until
        self.service_type = service_type

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

    def apply_discount(self, total_cost):
        if self.service_type == 'all' or self.service_type == current_service:
            return max(0, total_cost - self.amount)
        return total_cost

# 示例使用
current_date = datetime.now()
voucher = Voucher(code="SAVE20", amount=20, valid_until=datetime(2023, 12, 31), service_type='video')

if voucher.is_valid(current_date):
    final_cost = voucher.apply_discount(100)
    print(f"Final cost after discount: ${final_cost}")
else:
    print("Voucher has expired.")