[Solved] python, change value of matrix eye [closed]

You can do something like as follows.

import numpy as np

A = np.eye(3, 3)
B = np.eye(3, 3, k=-1)
B[B>0]=-1
C = A + B
C[0, 0] = 0
print(C)

Output:

[[ 0.  0.  0.]
 [-1.  1.  0.]
 [ 0. -1.  1.]]