Pylint Argument number differs from overridden method

[Wanderer]

Pylint W0221 gives the warning
Argument number differs from overridden method.

Why is this a problem? I'm overriding the method to add additional
functionality.

This
    def GetRays(self, angle, pt, lmbda = 0.6):
        """
        """

        angle, x, y, Rays, Power = self.ARefract(angle, pt[0], pt[1],
lmbda)
        pt1 = (x, y)

        return Rays, Power, angle, pt1


    def ARefract(self, angle, x, y, lmbda = 0.6):
        """
        """

        Nt = self.Mat.NtGet(lmbda)
        self.NtSet(Nt)
        angle, x, y, Rays, Power = self.Refract(angle, x, y)

        return angle, x, y, Rays, Power



Over rides this

    def GetRays(self, angle, pt):
        """
        """

        angle, x, y, Rays, Power = self.Refract(angle, pt[0], pt[1])
        pt1 = (x, y)

        return Rays, Power, angle, pt1


Thanks