code: def cluster_autocomplete(self, text, line, start_index, end_index):
          "autocomplete for the use command, obtain list of clusters first"
          if not self.CACHED_CLUSTERS:
              clusters = [cluster.name for cluster in api.get_all_clusters()]
              self.CACHED_CLUSTERS = clusters
  
          if text:
              return [cluster for cluster in self.CACHED_CLUSTERS if cluster.startswith(text)]
          else:
              return self.CACHED_CLUSTERf cluster_autocomplete(self, text, line, start_index, end_index):
          "autocomplete for the use command, obtain list of clusters first"
          if not self.CACHED_CLUSTERS:
              clusters = [cluster.name for cluster in api.get_all_clusters()]
              self.CACHED_CLUSTERS = clusters
  
          if text:
              return [cluster for cluster in self.CACHED_CLUSTERS if cluster.startswith(text)]
          else:
              return self.CACHED_CLUSTERS
docs: autocomplete for the use command, obtain list of clusters first