Problem with a dialog

[ast]

"Steven D'Aprano" <steve+comp.lang.python at pearwood.info> a écrit dans le message de 
news:54898820$0$12989$c3e8da3$5496439d at news.astraweb.com...

>
> As I said, most programming languages work like this. But a small minority
> use a different system, called "dynamic scoping". In dynamic scoping, it
> doesn't matter *where* a function is defined, only where it is called. With
> dynamic scoping, your code would have worked correctly.
>

Thank you  very much.

This is my mistake
I knew that a function defined in a scope "knows" the variables defined
in that scope, at least for reading (for writing, it is more complicated).
I didnt realize that my function/class was called, not defined in that
scope.