Count Nan-Values per Column in an ndarray

Problem:
I have a ndarray (2000,7) and I want to count the numbers of Nan’s per column and save it in an ndarray

Tried:

number_nan_in_arr = np.count_nonzero(np.isnan(arr))

But this count the total number of nan’s over all columns

Solution: ?

>Solution :

Simply sum the True values:

number_nan_in_arr = np.isnan(arr).sum(0)