def _stats(self):
        val = 4 - pi
        return (np.sqrt(pi/2), val/2, 2*(3-pi)*sqrt(pi)/val**1.5,
                6*pi/val-16/val**2)
dataset/ETHPy150Open scipy/scipy/scipy/stats/_continuous_distns.py/rayleigh_gen._stats/swapped operands of `-`