Thanks, Such methods return None to emphasize that they do not create new lists. i got it. 2012/7/8 Chris Rebert <c...@rebertia.com>
> On Sat, Jul 7, 2012 at 10:23 AM, levi nie <levinie...@gmail.com> wrote: > > 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] > > See http://stackoverflow.com/a/1682601 > list.extend(), list.append(), etc. operate in-place, mutating the > existing list object. Such methods return None to emphasize that they > do not create new lists. > > Regards, > Chris >
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