<a href="http:&#x2F;&#x2F;www.whatisthought.com&#x2F;eric.html#economies" rel="nofollow">http:&#x2F;&#x2F;www.whatisthought.com&#x2F;eric.html#economies</a> could be described that way (except the code&#x27;s not in Python AFAIK). It&#x27;s pretty interesting, though I haven&#x27;t seen any follow-on work.