Use np.pad
首先扩展数组并索引结果。您必须相应地改变您的索引。
>>> b = np.pad(a, pad_width=1, mode='constant')
>>> b
array([[ 0, 0, 0, 0, 0, 0, 0],
[ 0, 0, 1, 2, 3, 4, 0],
[ 0, 5, 6, 7, 8, 9, 0],
[ 0, 10, 11, 12, 13, 14, 0],
[ 0, 15, 16, 17, 18, 19, 0],
[ 0, 20, 21, 22, 23, 24, 0],
[ 0, 0, 0, 0, 0, 0, 0]])
>>>