On Sat, Jan 30, 2010 at 4:32 PM, Dan Brown <fsenz...@gmail.com> wrote: > Why does extending a list with the empty list result in None? It > seems very counterintuitive to me, at least --- I expected ['a'].extend > ([]) to result in ['a'], not None.
Extend is a method of the list. The list itself is changed, it does not return itself: >>> A = [1,2] >>> B = [3,4] >>> C = A.extend(B) >>> C >>> C is None True >>> A [1, 2, 3, 4] Thus, nothing special about extend([]), this is the general behaviour of extend -- André Engels, andreeng...@gmail.com -- http://mail.python.org/mailman/listinfo/python-list
