Brett Cannon added the comment:

https://docs.python.org/3/tutorial/classes.html for the docs that Roscoe is 
talking about.

So the sentence is technically correct, it just takes careful reading to grasp 
what's being said. There are "at least three nested scopes", but there can be 
*up to* four scopes. Since "the scopes of any enclosing functions" is not 
necessarily true for all code scopes, you end up with at least three, but 
possibly four scopes.

Obviously the wording could be clearer, so if you want to sign the CLA, Roscoe, 
and propose a rewording that would be appreciated!

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nosy: +brett.cannon

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