code: def rename_feature(self, old_feature, new_feature):
          
          # TODO: raise error if old_feature not found?
  
          self._check_label(new_feature)
          self._rename_label('feature', old_feature, new_feature)
docs: Change the label of a feature attached to the Bundle
  
          :parameter str old_feature: the current name of the feature
              (must exist)
          :parameter str new_feature: the desired new name of the feature
              (must not exist)
          :return: None
          :raises ValueError: if the new_feature is forbidden