Simple Names: Global Unless Assigned

Unqualified simple names follow the LEGB lexical scoping rule outlined for functions in Chapter 17:

Assignment (X = value)

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Makes names local: creates or changes the name X in the current local scope, unless declared global.

Reference (X)

Looks for the name X in the current local scope, then any and all enclosing functions, then the current global scope, then the built-in scope.