The |Marker| instance for this point, providing access to the visual
        properties of the data point marker, such as fill and line. Setting
        these properties overrides any value set at the series level.

def marker(self):
        """
        The |Marker| instance for this point, providing access to the visual
        properties of the data point marker, such as fill and line. Setting
        these properties overrides any value set at the series level.
        """
        dPt = self._ser.get_or_add_dPt_for_point(self._idx)
        return Marker(dPt)