code: def add_nodes(self, kind, num, image_id, image_user, flavor,
                    security_group, image_userdata='', **extra):
          
          for i in range(num):
              self.add_node(kind, image_id, image_user, flavor,
                            security_group, image_userdata=image_userdata, **extra)
docs: Helper method to add multiple nodes of the same kind to a cluster.
  
          :param str kind: kind of node to start. this refers to the groups
                           defined in the ansible setup provider
                           :py:class:`elasticluster.providers.AnsibleSetupProvider`
  
          :param int num: number of nodes to add of this kind
  
          :param str image_id: image id to use for the cloud instance (e.g.
                               ami on amazon)
  
          :param str image_user: user to login on given image
  
          :param str flavor: machine type to use for cloud instance
  
          :param str security_group: security group that defines firewall rules
                                     to the instance
  
          :param str image_userdata: commands to execute after instance starts