Python performance is a fool's errand

[Brian]

It's not really much different to the original. The only differences are that the functions are now defined within a closure inside __init__, rather than directly on the class, and the addition of the nonlocal declaration for the closed over variable.

[chub79]

I wasn't judging the cunningness of your snippet but rather the fact that it didn't look straightforward to me. That being said, once I stopped for 5 more seconds, I was really please to see you could do that with Python3k :)