On Tue, 28 Sep 2010 20:11:51 +0100, Rog wrote: > On Tue, 28 Sep 2010 11:59:08 -0700, geremy condra wrote: > >> On Tue, Sep 28, 2010 at 11:44 AM, Rog <r...@pynguins.com> wrote: >>> Hi all, >>> Have been grappling with a list problem for hours... a = [2, 3, 4, >>> 5,.....] >>> b = [4, 8, 2, 6,.....] >>> Basicly I am trying to place a[0], b[0] in a seperate list IF a[2] and >>> b[2] is present. >>> I have tried sets, zip etc with no success. I am tackling Euler >>> projects with Python 3.1, with minimal knowledge, and having to tackle >>> the language as I progress. Enjoyable frustration :) >> >> I'm not clear on what your actual problem is, could you restate it? >> >> It sounds like you want to copy the ith element out of a and b into >> some other list- call it c- when the (i+2)th element meets some >> condition. What's the condition? >> >> Geremy Condra > > The condition is that the i-th element is inverted, but not equal. eg > 4,2 - 2,4 , 34,5 - 5,34 etc. > Hope that is clearer.
Clear as mud. Perhaps you should given an example. Given input a = [2, 3, 4, 5, 6, 7] b = [4, 8, 2, 6, 10, 42] what output are you expecting, and how would you work it out by hand? -- Steven -- http://mail.python.org/mailman/listinfo/python-list