numpy库简要

ndarray类型、创建和变换

代码如下

import numpy as np
a=np.arange(24,0,-1).reshape(3,2,4)
np.ndim(a)
np.shape(a)
np.size(a)
a.dtype

输出结果

out

array([[[24, 23, 22, 21],
        [20, 19, 18, 17]],

       [[16, 15, 14, 13],
        [12, 11, 10,  9]],

       [[ 8,  7,  6,  5],
        [ 4,  3,  2,  1]]])
3
(3, 2, 4)
24
dtype('int32')

第一次写博客，就先这样