def _sf(self, x, K):
        invK = K / 1.0
        expval = invK * (0.5 * invK - x)
        return _norm_cdf(-x) + exp(expval) * _norm_cdf(x - invK)
dataset/ETHPy150Open scipy/scipy/scipy/stats/_continuous_distns.py/exponnorm_gen._sf/swapped operands of `/`