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| Date | Sat, 7 Jul 2012 10:35:49 -0700 |
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| Subject | Re: something go wrongly |
| From | Chris Rebert <clp2@rebertia.com> |
| To | levi nie <levinie001@gmail.com> |
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On Sat, Jul 7, 2012 at 10:23 AM, levi nie <levinie001@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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Re: something go wrongly Chris Rebert <clp2@rebertia.com> - 2012-07-07 10:35 -0700
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