Numpyで行列に行や列を貼り合わせる方法

In [23]: M = arange(9).reshape(3, 3)

In [24]: M
Out[24]: 
array([[0, 1, 2],
       [3, 4, 5],
       [6, 7, 8]])

In [25]: c_[M, [7, 7, 7]]
Out[25]: 
array([[0, 1, 2, 7],
       [3, 4, 5, 7],
       [6, 7, 8, 7]])

In [27]: r_[M, [[7, 7, 7]]]
Out[27]: 
array([[0, 1, 2],
       [3, 4, 5],
       [6, 7, 8],
       [7, 7, 7]])