John Salerno schrieb:
> Here's a sentence from Learning Python:
>
> "Names not assigned a value in the function definition are assumed to be
> enclosing scope locals (in an enclosing def), globals (in the enclosing
> module's namespace) or built-in (in the predefined __builtin__ names
> module Python provides."
>
> I have trouble reading this sentence. First, I don't understand if the
> word 'enclosing' is a verb or an adjective. The whole flow of the
> sentence seems convoluted.
>
> But my real question is this, which is related to the above:
>
> "Name references search at most four scopes: local, then enclosing
> functions (if any), then global, then built-in."
>
> I understand what global and built-in are, and I thought I understood
> the concept of local too, but when I got to this sentence (and the
> previous sentence), I became confused about the first two scopes. What's
> the difference between 'local' and 'enclosing functions'? I thought that
> the only way to create a local namespace was if there *was* a function
> definition, so now I'm confused by the apparent difference that the
> authors are referring to. What's an example of a local scope without
> having a function definition? Loops and if statements, perhaps?
>
Nested functions, I should think. Absolutely silly, but working example:
>>> def outer():
arg_in = 2
def inner():
x = arg_in * 3
return x
return inner()
>>> outer()
6
Seen from the inside of "inner" x is local, arg_in is in the enclosing
function.
--
Dr. Sibylle Koczian
Universitaetsbibliothek, Abt. Naturwiss.
D-86135 Augsburg
e-mail : [EMAIL PROTECTED]
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