def zunionstore(self, dest, keys, aggregate=None):
with self.pipe as pipe:<EOL><INDENT>keys = [self.redis_key(k) for k in keys]<EOL>return pipe.zunionstore(self.redis_key(dest), keys,<EOL>aggregate=aggregate)<EOL><DEDENT>
Union multiple sorted sets specified by ``keys`` into
a new sorted set, ``dest``. Scores in the destination will be
aggregated based on the ``aggregate``, or SUM if none is provided.