def cmd_clear(self, conn):
        self.playlist = []
        self.playlist_version += 1
        self.cmd_stop(conn)
Set the ancestor for the query
dataset/ETHPy150Open beetbox/beets/beetsplug/bpd/__init__.py/BaseServer.cmd_clear--crossover with--dataset/ETHPy150Open GoogleCloudPlatform/gcloud-python/gcloud/datastore/query.py/Query.ancestor