code: def is_expired(self, max_idle_seconds):
          
  
          now = current_time()
          return (self.expiration_time is not None and self.expiration_time < now) or \
                 (max_idle_seconds is not None and self.last_access_time + max_idle_seconds < now)
docs: Determines whether this record is expired or not.
  
          :param max_idle_seconds: (long), the maximum idle time of record, maximum time after the last access time.
          :return: (bool), ``true`` is this record is not expired.