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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def add_point_region(self, y: float, x: float) -> Graphic: """Add a point graphic to the data item. :param x: The x coordinate, in relative units [0.0, 1.0] :param y: The y coordinate, in relative units [0.0, 1.0] :return: The :py:class:`nion.swift.Facade.Graphic` object that was added. .. versionadded:: 1.0 Scriptable: Yes """

        graphic = Graphics.PointGraphic()
        graphic.position = Geometry.FloatPoint(y, x)
        self.__display_item.add_graphic(graphic)
        return Graphic(graphic)