numpy extend array

import numpy as np

b = np.array([
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
    ], dtype='float')

b = np.concatenate((np.transpose([b[:, 0]]), b), axis=1) # left
b = np.concatenate((b, np.transpose([b[:, -1]])), axis=1) # right
b = np.concatenate(([b[0, :]], b), axis=0) # up
b = np.concatenate((b, [b[-1, :]]), axis=0) # down

print(b)