How to take average between NaN values?

Question

I have a simple list that contains numbers and NaN values. Is there a way to take the AVG between two NaN values? an example could be like this:

list = [NaN, 5, 6, 7, NaN, NaN, NaN, 6, 2, 8, 5, 4, NaN, NaN]

and I would expect an output like

Output = [6,5] 

Answer 1

Use the groupby from itertools -

import numpy as np
from itertools import groupby
NaN = np.nan
lst = [NaN, 5, 6, 7, NaN, NaN, NaN, 6, 2, 8, 5, 4, NaN, NaN]
[np.mean(list(g)) for k, g in groupby(lst, key=lambda x: x is not NaN) if k]
# [6.0, 5.0]