python [::-1] [::-1,::-1]的具体使用

一、 [::-1]

import numpy as np
import numpy as np
x = np.arange(1, 6)
print("Original array:")
print(x)
print("Reverse array:")
x = x[::-1]
print(x)

'''
Original array:
[1 2 3 4 5]
Reverse array:
[5 4 3 2 1]
'''

[::-1] ：会将数组的元素逆向输出

二、 [::-1,::-1]

nums=np.array([[1,2,3,4],
             [5,6,7,8],
             [9,10,11,12],
             [13,14,15,16]])
print(nums[::-1,::-1])

'''
[[16 15 14 13]
[12 11 10  9]
[ 8  7  6  5]
[ 4  3  2  1]]
'''

来源：https://blog.csdn.net/wxfighting/article/details/124616012