I have written a Tk GUI that upon pressing a button, will launch a subprocess
to open a dos-box "cmd.exe".
I need the GUI to monitor the returncode of this subprocess, so that when
the dos box closes with return code 0, a subroutine can be executed to
handle this event. BUT while the dos box is open, the GUI must still
monitor all other events in mainloop() ( ie. GUI cannot hang ).
snipplet of code: >>>
import subprocess
s= subprocess.Popen( 'cmd.exe' )
# s.poll() ???
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