1 import numpy as np 2 a=np.random.rand(5) 3 print(a) 4 [ 0.64061262 0.8451399 0.965673 0.89256687 0.48518743] 5 6 print(a[-1]) ###取最后一个元素 7 [0.48518743] 8 9 print(a[:-1]) ### 除了最后一个取全部 10 [ 0.64061262 0.8451399 0.965673 0.89256687] 11 12 print(a[::-1]) ### 取从后向前（相反）的元素 13 [ 0.48518743 0.89256687 0.965673 0.8451399 0.64061262] 14 15 print(a[2::-1]) ### 取从下标为2的元素翻转读取 16 [ 0.965673 0.8451399 0.64061262]