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Scopes and Nested Functions
So far, I’ve omitted one part of Python’s scope rules on purpose, because it’s relatively rare to encounter it in practice. However, it’s time to take a deeper look at the letter E in the LEGB lookup rule. The E layer is fairly new (it was added in Python 2.2); it takes the form of the local scopes of any and all enclosing function defs. Enclosing scopes are sometimes also called statically nested scopes. Really, the nesting is a lexical one—nested scopes correspond to physically and syntactically nested code structures in your program’s source code.
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