[Python] conversion between (n, 1) and (n,) in numpy

edition ：
numpy=1.19.3
python=3.6

One 、 (n,1) turn (n,)

Code ：

import numpy as np
a = np.array([[12],[26],[40],[66]])
print(a.shape)

result：

(4, 1)

take （4,1） To （4,）

a_post_1 = np.squeeze(a)
print(a_post_1.shape)

result：

(4,)

Two 、 (n,) turn (n,1)

Code ：

import numpy as np
b = np.array([12,26,40,66])
print(b.shape)

result：

(4,)

take （4,） To （4,1）

b_post_1 = b.reshape(-1,1)
print(b_post_1.shape)

perhaps

b_post_2 = np.reshape(b,(-1,1))
print(b_post_2.shape)

result：

(4, 1)
(4, 1)

Reference resources ：https://blog.csdn.net/zkp_987/article/details/119989767