如何获取Numpy数据的基本属性

1. 创建数组

import numpy as np

a1 = np.array([[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]])
print(a1)

结果：
[[ 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]]

2. 数组形状

import numpy as np

a1 = np.array([[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]])
print(a1.shape)

结果：
(6, 6)

3. 数组大小

import numpy as np

a1 = np.array([[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]])
print(a1.size)

结果
36

4. 数组维数

import numpy as np

a1 = np.array([[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]])
print(a1.ndim)

结果：
2