import numpy as np
x = np.arange(12).reshape(3, 4)
print(x)
print(np.mean(x, axis=0, keepdims=True))
print(np.mean(x, axis=-1, keepdims=True))
aW1wb3J0IG51bXB5IGFzIG5wCgp4ID0gbnAuYXJhbmdlKDEyKS5yZXNoYXBlKDMsIDQpCgpwcmludCh4KQpwcmludChucC5tZWFuKHgsIGF4aXM9MCwga2VlcGRpbXM9VHJ1ZSkpCnByaW50KG5wLm1lYW4oeCwgYXhpcz0tMSwga2VlcGRpbXM9VHJ1ZSkp