"""This minimal example shows a problem in Tkinter's wait_variable.
If one closes the root window while wait_variable is executing,
the prompt never comes back. ^C has no effect.
Using atexit does not help.
One can work around the problem by binding to <Destroy>
(see commented out code below).
"""
import Tkinter

root = Tkinter.Tk()
waitVar = Tkinter.BooleanVar()
isDone = False

def trigger():
	global waitVar
	waitVar.set(True)
	
def script():
	global isDone, waitVar
	for count in range(10):
		print "script", count
		if not isDone:
			root.after(1000, trigger)
			root.wait_variable(waitVar)
		else:
			print "script cancelled"
			return
	print "script done"

# uncomment the following to work around the problem:
#def delWin(evt):
#	global isDone
#	print "delWin"
#	isDone = True
#	trigger()
#root.bind("<Destroy>", delWin)

script()

root.mainloop()