def __contains__(self, val):
        return self._client.sismember(self.set_key, val)
Construct a ``zfs`` command which will output the names of the snapshots of
dataset/ETHPy150Open lethain/Redis-Python-Datastructures/redis_ds/redis_set.py/RedisSet.__contains__--crossover with--dataset/ETHPy150Open ClusterHQ/flocker/flocker/volume/filesystems/zfs.py/_list_snapshots_command