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From: Neil Cerutti <neilc@norwich.edu>
Newsgroups: comp.lang.python
Subject: Re: First attempt at a Python prog (Chess)
Date: 15 Feb 2013 16:17:02 GMT
Organization: Norwich University
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On 2013-02-15, Oscar Benjamin <oscar.j.benjamin@gmail.com> wrote:
> if score > best_score or best_score is None:

You need the None check first to avoid an exception from the
comparison.

if best_score is None or score > best_score:

-- 
Neil Cerutti