Detecting a GUI session

[Leith Bade]

I would like to know whether my GUI program is being run under python or
pythonw.
 
I would like to know this so I can redirect stderr when their is no
console window (pythonw) otherwise leave it spitting to the console
window (python).
 
This is because I debug using python while the customer release build
uses pythonw.
 
I can see their is sys.executable but a google search turned up various
discussions on what this actually means (e.g when run under an
integrated exe file - which we do for our release builds).
 
Leith Bade
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