import numpy as np
arr = [[2, 2, 2, 2, 2],
[15, 6, 27, 8, 2],
[23, 2, 54, 1, 2, ],
[11, 44, 34, 7, 2]]
print("\nstd of arr, axis = None : ", np.std(arr))
print("\nstd of arr, axis = 0 : ", np.std(arr, axis = 0))
print("\nstd of arr, axis = 1 : ", np.std(arr, axis = 1))