For me, an 'is' test works to find out what widget the event is taking place on.
#------------------------------------------------------------------------
import Tkinter
def display_event(e):
print "event received", e.widget, e.widget is t
t = Tkinter.Tk()
t.bind("<Destroy>", display_event)
w = Tkinter.Entry(t)
t.destroy()
#------------------------------------------------------------------------
This program prints:
event received .-1209415348 False
event received . True
if that fails, you could compare str(e.widget) and t._w, though this can
give a false positive if you have multiple Tk() instances---each Tk()
instance is called ".".
Jeff
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