autoscale = boto.connect_autoscale()
ec2 = boto.connect_ec2()
group = autoscale.get_all_groups(['mygroupname'])[0]
instance_ids = [i.instance_id for i in group.instances]
reservations = ec2.get_all_instances(instance_ids)
instances = [i for r in reservations for i in r.instances]
List instances in auto scaling group with boto