>>> import numpy as np
>>> a = np.arange(120).reshape(2,3,4,5)
>>> a
array([[[[ 0, 1, 2, 3, 4],
[ 5, 6, 7, 8, 9],
[ 10, 11, 12, 13, 14],
[ 15, 16, 17, 18, 19]],
[[ 20, 21, 22, 23, 24],
[ 25, 26, 27, 28, 29],
[ 30, 31, 32, 33, 34],
[ 35, 36, 37, 38, 39]],
[[ 40, 41, 42, 43, 44],
[ 45, 46, 47, 48, 49],
[ 50, 51, 52, 53, 54],
[ 55, 56, 57, 58, 59]]],
[[[ 60, 61, 62, 63, 64],
[ 65, 66, 67, 68, 69],
[ 70, 71, 72, 73, 74],
[ 75, 76, 77, 78, 79]],
[[ 80, 81, 82, 83, 84],
[ 85, 86, 87, 88, 89],
[ 90, 91, 92, 93, 94],
[ 95, 96, 97, 98, 99]],
[[100, 101, 102, 103, 104],
[105, 106, 107, 108, 109],
[110, 111, 112, 113, 114],
[115, 116, 117, 118, 119]]]])
分成2块，再分成3块，再4行5列，最后一行右侧有几个中括号，表示是几维的
显示全部数组：
import numpy as np
np.set_printoptions(threshold=np.inf)冒号：
>>> b = a[:,:,:,:3]
>>> b
array([[[[ 0, 1, 2],
[ 5, 6, 7],
[ 10, 11, 12],
[ 15, 16, 17]],
[[ 20, 21, 22],
[ 25, 26, 27],
[ 30, 31, 32],
[ 35, 36, 37]],
[[ 40, 41, 42],
[ 45, 46, 47],
[ 50, 51, 52],
[ 55, 56, 57]]],
[[[ 60, 61, 62],
[ 65, 66, 67],
[ 70, 71, 72],
[ 75, 76, 77]],
[[ 80, 81, 82],
[ 85, 86, 87],
[ 90, 91, 92],
[ 95, 96, 97]],
[[100, 101, 102],
[105, 106, 107],
[110, 111, 112],
[115, 116, 117]]]])
>>> c = a[:,:,:,3:3+3]
>>> c
array([[[[ 3, 4],
[ 8, 9],
[ 13, 14],
[ 18, 19]],
[[ 23, 24],
[ 28, 29],
[ 33, 34],
[ 38, 39]],
[[ 43, 44],
[ 48, 49],
[ 53, 54],
[ 58, 59]]],
[[[ 63, 64],
[ 68, 69],
[ 73, 74],
[ 78, 79]],
[[ 83, 84],
[ 88, 89],
[ 93, 94],
[ 98, 99]],
[[103, 104],
[108, 109],
[113, 114],
[118, 119]]]])