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Describe nested scopes in the tutorial. Closes SF bug 500704.

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Raymond Hettinger 2002-08-07 16:09:48 +00:00
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Doc/tut/tut.tex
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@ -3551,12 +3551,17 @@ that an unqualified reference to a name attempts to find the name in
the namespace. the namespace.
Although scopes are determined statically, they are used dynamically. Although scopes are determined statically, they are used dynamically.
At any time during execution, exactly three nested scopes are in use At any time during execution, there are at least three nested scopes whose
(exactly three namespaces are directly accessible): the namespaces are directly accessible: the innermost scope, which is searched
innermost scope, which is searched first, contains the local names, first, contains the local names; the namespaces of any enclosing code
the middle scope, searched next, contains the current module's global blocks (a module, function, or class definition) which are searched starting
names, and the outermost scope (searched last) is the namespace with the nearest enclosing scope; the middle scope, searched next, contains
containing built-in names. the current module's global names; and the outermost scope (searched last)
is the namespace containing built-in names.
If a name is declared global, then all references and assignments go
directly to the middle scope containing the module's global names.
Otherwise, all variables found outside of the innermost scope are read-only.
Usually, the local scope references the local names of the (textually) Usually, the local scope references the local names of the (textually)
current function. Outside of functions, the local scope references current function. Outside of functions, the local scope references