Replacing all elements except NaN in Python

I want to replace all elements in array X except nan with 10.0. Is there a one-step way to do it? I present the expected output.

import numpy as np
from  numpy import nan

X = np.array([[3.25774286e+02, 3.22008654e+02, nan, 1.85356823e+02,
        1.85356823e+02, 3.22008654e+02, nan, 3.22008654e+02]])

The expected output is

X = array([[10.0, 10.0, nan, 10.0,
        10.0, 10.0, nan, 10.0]])

>Solution :

You can use a combination of numpy.isnan and numpy.where.

>>> np.where(np.isnan(X), X, 10)
array([[10., 10., nan, 10., 10., 10., nan, 10.]])