'Lists the instances in the specified instance group.
Scopes needed - one of the following:
* https://www.googleapis.com/auth/cloud-platform
* https://www.googleapis.com/auth/compute
* https://www.googleapis.com/auth/compute.readonly
:return:  List of :class:`GCENode` objects.
:rtype: ``list`` of :class:`GCENode` objects.'

def list_instances(self):

    return self.driver.ex_instancegroup_list_instances(instancegroup=self)
