[Tutor] Using popen

[Sean 'Shaleh' Perry]

> That's helpful, Sean, yes. However, I still don't understand even in 
> this case, why I got a return of 256. I should have gotten None. At 
> least, that command in the shell returns an exit code of zero with 
> the data I tested. Shouldn't it return the same result in Python with 
> popen? (i.e. in case of exitcode = 0, popen.close() should return 
> None.)
> 
> Still confused...
> 

one can only assume that the authenticate script is unhappy for some reason. 
If you have the source, consider adding some print statements which get logged
to a file.  Look for any 'exit 1' type lines, and see why you would get there.