'Return the Region object that contains the given Zone object.
:param  zone: Zone object
:type   zone: :class:`GCEZone`
:return:  Region object that contains the zone
:rtype:   :class:`GCERegion`'

def _get_region_from_zone(self, zone):

    for region in self.region_list:
        zones = [z.name for z in region.zones]
        if (zone.name in zones):
            return region
