Learning Python, 3rd Edition by Mark Lutz

Author:Mark Lutz
Language: eng
Format: epub, azw3
ISBN: 9780596158217
Publisher: O'Reilly Media, Inc.
Published: 2008-03-30T16:00:00+00:00

Nested Scope Details

With the addition of nested function scopes, variable lookup rules become slightly more complex. Within a function:

An assignment (X = value) creates or changes the name X in the current local scope, by default. If X is declared global within the function, it creates or changes the name X in the enclosing module's scope instead.

A reference (X) looks for the name X first in the current local scope (function); then in the local scopes of any lexically enclosing functions in your source code, from inner to outer; then in the current global scope (the module file); and finally in the built-in scope (the module _ _builtin_ _). global declarations make the search begin in the global (module file) scope instead.

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