list problem...

[Rog]

On Tue, 28 Sep 2010 11:59:08 -0700, geremy condra wrote:

> On Tue, Sep 28, 2010 at 11:44 AM, Rog <rog at 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.
Thanks for the response.
-- 
Rog
http://www.rog.pynguins.com