Javier wrote:

>  Class Data has a class attribute, 'f', defined as an empty string. Check if 
> Data.f is initialized before calling getImg.
>  Also, why initialize with an empty str? Put a None in there or don't define 
> the attribute at all.
>  A tip: in line 126 there is a print Data.f. This will show nothing in this 
> case. When printing for debugging, error reporting or user input, always 
> place quotes around values so that it is easier to spot empty strings or non 
> printable characters.
>  Finally, keep in mind that you can always use pdb to see what's up.
>
>Javier
>  
>

Thanks,
    I'll try to clean up what had gotten past me.

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