Boris Borcic <[EMAIL PROTECTED]> writes: > >> For example, if I have x=[ [1,2], [3,4] ] > >> > >> What I want is a new list of list that has four sub-lists: > >> > >> [[1,2], [f(1), f(2)], [3,4], [f(3), f(4)]] > > [[a, map(f,a)] for a in x] > > no, that one will be [[[1,2], [f(1), f(2)]], [[3,4], [f(3), f(4)]]] > eg two sublists instead of four.
Oh ugh, I misread the original request and thought the extra brackets were there. I think the following works and is reasonably intuitive: from itertools import chain y = list(chain(*([a, map(f,a)] for a in x))) But the original request itself seems a bit weird. -- http://mail.python.org/mailman/listinfo/python-list