'Remove instances from this load balancer. Removing instances that are
not registered with the load balancer has no effect.
:param list instances: List of instance IDs (strings) that you\'d like
to remove from this load balancer.'

def deregister_instances(self, instances):

    if isinstance(instances, six.string_types):
        instances = [instances]
    new_instances = self.connection.deregister_instances(self.name, instances)
    self.instances = new_instances
