Get the members of a nodegroup, must be run from the master

get_nodegroup_membership.py

#!/usr/bin/env python
import salt.config
import salt.client
opts = salt.config.master_config('/etc/salt/master')
_client = salt.client.LocalClient()
_ret = {}
for _group, _target in opts.get('nodegroups').iteritems():
    _ret[_group] = _client.cmd(tgt=_target, fun='test.ping', expr_form='compound').keys()
print _ret