[Tutor] Redirecting output

[John Murray]

I'm building a tkinter front end for an existing command line program. When 
this is started from the cl it prints out a couple of lines of text to 
indicate that it has started OK etc. I'd like to redirect this to a label 
widget or similar in the front end. However, when I start it from the cl with 
stdout or stderr (or both) redirected to a text file, the output doesn't 
appear on screen (this is normal) but the file created remains empty. Where 
is the output going? Redirecting stdout from shell commands works normally. 
A bit off-topic I know but hoping someone can help.
                         Cheers
                            John