[PYTHON] Get all IP addresses of instances in the autoscaling group

import commands
import re

def ipv4_address(instance_id):
  query = "Reservations[].Instances[?InstanceId=='%(instance_id)s'].PublicIpAddress" % locals()
  cmdline = 'aws ec2 describe-instances --query "%(query)s" --output text' % locals()
  return commands.getoutput(cmdline)

def autoscaling_instance_ids(group):
  query = "AutoScalingInstances[?AutoScalingGroupName=='%(group)s'].InstanceId" % locals()
  result = commands.getoutput('aws autoscaling describe-auto-scaling-instances --query "%(query)s" --output text' % locals())
  regexp = re.compile(r'\s+')
  instance_ids = regexp.split(result)
  return instance_ids

def ip_of_the_group(group):
  ids = autoscaling_instance_ids(group)
  return [ ipv4_address(instance_id) for instance_id in ids ]

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