You should check out the sets module:
http://docs.python.org/lib/module-sets.html
>
> The problem asks to create a "compareandremove" so that you can use it on a
> string, to remove the words from the string that are contained in un_words.
>
> The remaining words then need to be compared to the alterns list and either
> bring back the word if no matches or bring back the list. To better explain
> that i'll use an example.
>
> If i do compareandremove('notepad a pencil with desk')
>
> I need it so it removes words contained in un_words, so "a" and "with";
> then compares the remaining words to alterns to find a match.
>
> This should bring back:
>
> ['notepad', 'book', 'textbook', 'pencil', 'pen', 'pacer', 'desk']
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