code: def insert(self, index: int, item: object) -> None:
          
          self._blueprints.insert(index, item)
docs: The Abstract class `MutableSequence` leverages this insert method to
          perform the `BlueprintGroup.append` operation.
  
          :param index: Index to use for removing a new Blueprint item
          :param item: New `Blueprint` object.
          :return: None