code: async def scale(self, scale=None, scale_change=None):
          
          app_facade = client.ApplicationFacade.from_connection(self.connection)
  
          if (scale, scale_change) == (None, None):
              raise ValueError('Must provide either scale or scale_change')
  
          log.debug(
              'Scaling application %s %s %s',
              self.name, 'to' if scale else 'by', scale or scale_change)
  
          await app_facade.ScaleApplications([
              client.ScaleApplicationParam(application_tag=self.tag,
                                           scale=scale,
                                           scale_change=scale_change)
          ])
docs: Set or adjust the scale of this (K8s) application.
  
          One or the other of scale or scale_change must be provided.
  
          :param int scale: Scale to which to set this application.
          :param int scale_change: Amount by which to adjust the scale of this
              application (can be positive or negative).