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)
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