关于list的切片

Posted 2020-10-25 qianzeng

range(start, stop, step)

1 l = [1,2,3,4,5,6,7,8,9]
2 print l[2:]
3 print l[:2]
4 print l[::2]
5 print l[-2:]
6 print l[:-2]
7 print l[::-2]

python2.7，输出如下：

[3, 4, 5, 6, 7, 8, 9]
[1, 2]
[1, 3, 5, 7, 9]
[8, 9]
[1, 2, 3, 4, 5, 6, 7]
[9, 7, 5, 3, 1]