NameError: global name 'btn_Matlab' is not defined ?

[Steven D'Aprano]

On Tue, 28 Dec 2010 14:34:19 +0100, Stef Mientki wrote:

> hello,
> 
> Never seen this before and I've no explanation whatsoever (Python 2.6)
> 
> I've some dynamic generated code,
> one of objects generated is a wx.Button, called 'btn_Matlab'.

How do you generate the code?

What code is generated? What does it do?


> After the code is generated, I can see that the button is created in the
> local namespace
>  
>    print locals()['btn_Matlab']
> 
> <wx._controls.Button; proxy of <Swig Object of type 'wxButton *' at
> 0x3602d28> >
> 
> but if I try to print the button (at exactly the same location), I get
> an error
> 
>     print btn_Matlab
> 
> NameError: global name 'btn_Matlab' is not defined ?
> 
> Why isn't the compiler first checking the local namespace ? any clues ?


My guess is that you've declared btn_Matlab as global, and then 
dynamically created a local with the same name using exec or similar.



-- 
Steven