def get_flush_lists(self, keys):
        return set(e for flush_list in
                   [_f for _f in list(cache.get_many(keys).values()) if _f]
                   for e in flush_list)
Return a set of object keys from the lists in `keys`.
dataset/ETHPy150Open django-cache-machine/django-cache-machine/caching/invalidation.py/Invalidator.get_flush_lists