code: def attach_lb_to_subnets(self, name, subnets):
          
          params = {'LoadBalancerName' : name}
          self.build_list_params(params, subnets, 
                                 'Subnets.member.%d')
          return self.get_list('AttachLoadBalancerToSubnets', 
                               params,
                               None)
docs: Attaches load balancer to one or more subnets.
          Attaching subnets that are already registered with the 
          Load Balancer has no effect.
  
          :type name: string
          :param name: The name of the Load Balancer
  
          :type subnets: List of strings
          :param subnets: The name of the subnet(s) to add.
  
          :rtype: List of strings
          :return: An updated list of subnets for this Load Balancer.