my code: aList=[1,2,3,4,5,6,7,8,9,10] xList=[1,2,3] print "now aList is",aList.extend(xList) output: now aList is None what i want is [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3] -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/python-list/attachments/20120708/5711758e/attachment.html>