如何翻转numpy数组的一半

import numpy as np

arr = np.array([1, 2, 3, 4, 5, 6])

length = arr.shape[0]

arr[length//2:] = arr[length//2:][::-1]

print(arr)

import numpy as np

arr = np.array([1, 2, 3, 4, 5, 6])
length = arr.shape[0]
arr[length//2:] = arr[length//2:][::-1]
print(arr)