def pointm(self, x, y, m=None):
        """Creates a POINTM shape.
        If the m (measure) value is not set, it defaults to NoData."""
        shapeType = POINTM
        pointShape = Shape(shapeType)
        pointShape.points.append([x, y, m])
        self.shape(pointShape)
Creates a POINTM shape.
        If the m (measure) value is not set, it defaults to NoData.