python：shape

shape函数用来了解数组的结构

import numpy as np

#对于一维的数据
data = np.array([1,2,3,4,5,6,7,8])
print(data.shape)
print(type(data.shape))
print(data.shape[0])

输出：
(8,)

8

#对于二维的数据
data = np.array([[1,2,3,4],[5,6,7,8]])
print(data.shape)
print(type(data.shape))
print(data.shape[0])

输出：
(2, 4)

2

#对于三维的数据
data = np.array([[[1,2], [3, 4]],[[5,6],[7,8]]])
print(data.shape)
print(type(data.shape))
print(data.shape[0])

输出：
(2, 2, 2)

2