>>> list=[1,2,3,4,5,6,7,8,9] >>> list[9:0:-2] [9, 7, 5, 3] >>> list[10:0:-2] [9, 7, 5, 3] I want to know whether they have some difference. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/tutor/attachments/20130820/7aa5cee3/attachment-0001.html>