'Return IDs of regions in which this app is listed.
If `excluded` is provided we\'ll use that instead of doing our own
excluded lookup.'

def get_region_ids(self, restofworld=False, excluded=None):

    if restofworld:
        all_ids = mkt.regions.ALL_REGION_IDS
    else:
        all_ids = mkt.regions.REGION_IDS
    if (excluded is None):
        excluded = self.get_excluded_region_ids()
    return sorted((set(all_ids) - set((excluded or []))))
