def _extract_attached_to(disk):
    users = disk.get('users', [])
    if not users:
        return None
    if len(users) > 1:
        raise GCEVolumeException(
            "Volume is attached to more than one instance:{}".format(disk))
    return unicode(users[0].split('/')[-1])
This function checks whether translation files provide a translation for some
dataset/ETHPy150Open ClusterHQ/flocker/flocker/node/agents/gce.py/_extract_attached_to--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-0.96/django/utils/translation/trans_real.py/get_partial_date_formats