|GroupShapes| object for this group.

        The |GroupShapes| object provides access to the group's member shapes
        and provides methods for adding new ones.

def shapes(self):
        """|GroupShapes| object for this group.

        The |GroupShapes| object provides access to the group's member shapes
        and provides methods for adding new ones.
        """
        from pptx.shapes.shapetree import GroupShapes
        return GroupShapes(self._element, self)