code: def get_subset(self, subset):
          
          if len(subset) > 50:
              raise ze.TooManyItems("You may only retrieve 50 items per call")
          # remember any url parameters that have been set
          params = self.url_params
          retr = []
          for itm in subset:
              retr.extend(self.item(itm))
              self.url_params = params
          # clean up URL params when we're finished
          self.url_params = None
          return retr
docs: Retrieve a subset of items
          Accepts a single argument: a list of item IDs