[Python] Numpy Array 특정 행 특정 열만 계산하는 방법

import numpy as np

list_1 = [[1,2,3,4,5], [6,7,8,9,10]]
list_2 = [[11,12,13,14,15]]
list_3 = [[16,17,18,19,20]]

array_1 = np.array(list_1)
array_2 = np.array(list_2)

array_combine = np.concatenate([array_1, array_2, list_3], axis=0)
print(array_combine, array_combine.shape)

print(array_combine[0])
print(array_combine[0].sum())

print(array_combine[3,:])
print(array_combine[3,:].sum())

print(array_combine[:,0])
print(array_combine[:,0].sum())

print(array_combine[:,2])
print(array_combine[:,2].sum())