get the diagonal from a matrix python code example

Example 1: python create a matrix with one in diagonal

# Create a matrix in python and fill
import numpy as np
a = np.zeros((3, 3), int) # Create matrix with only 0
np.fill_diagonal(a, 1) # fill diagonal with 1
print(a)

Example 2: numpy get diagonal matrix from matrix

np.diag(np.diag(x))