code: def delay(self, secondsLater):
          
          if self.cancelled:
              raise error.AlreadyCancelled
          elif self.called:
              raise error.AlreadyCalled
          else:
              self.delayed_time += secondsLater
              if self.delayed_time < 0:
                  self.activate_delay()
                  self.resetter(self)
docs: Reschedule this call for a later time
  
          @type secondsLater: C{float}
          @param secondsLater: The number of seconds after the originally
          scheduled time for which to reschedule this call.
  
          @raise AlreadyCancelled: Raised if this call has been cancelled.
          @raise AlreadyCalled: Raised if this call has already been made.