How to use ndmin, Changing the dimensions of an array (python-numpy)

import numpy as np

a=np.array([1,2,3,])
print(a.ndim)　　　　　　#ndim is a function that returns the dimension of an array

　⇒ 1

a=np.array([1,2,3,],ndmin=2) #Set the dimension to 2
print(a)

　⇒ array([[1, 2, 3]])

print(a.ndim)

　⇒ 2