Tiger input the following code on the problem, because there is no clear matrix format. Just add a box outside the matrix group. See the following for details.

source code

import time
import numpy as np

A = np.array([56.0, 0.0, 4.4, 68.0],
             [1.2, 104.0, 52.0, 8.0],
             [1.8, 135.0, 99.0, 0.9])

cal=A.sum(axis=0)
print(cal)

After modification

import time
import numpy as np

A = np.array([[56.0, 0.0, 4.4, 68.0],
             [1.2, 104.0, 52.0, 8.0],
             [1.8, 135.0, 99.0, 0.9]])

cal=A.sum(axis=0)
print(cal)