numpy库中p[...,1]和p[:,1]的区别

Question

numpy库中p[...,1]和p[:,1]的区别

Answer 1

同一种切片的两种写法，得到的结果相同。

>>> import numpy as np
>>> a = np.arange(6).reshape(2,3)
>>> a
array([[0, 1, 2],
       [3, 4, 5]])
>>> a[...,1]
array([1, 4])
>>> a[:,1]
array([1, 4])
>>> a[...,1] == a[:,1]
array([ True,  True])
>>> a[...,1] is a[:,1]
False