code: def MakeGoogleUniqueID(cloud_instance):
    
    if not (cloud_instance.zone and cloud_instance.project_id and
            cloud_instance.instance_id):
      raise ValueError("Bad zone/project_id/id: '%s/%s/%s'" %
                       (cloud_instance.zone, cloud_instance.project_id,
                        cloud_instance.instance_id))
    return "/".join([
        cloud_instance.zone.split("/")[-1], cloud_instance.project_id,
        cloud_instance.instance_id
    ])
docs: Make the google unique ID of zone/project/id.