Tal Einat added the comment:
I put the try/except outside of the loop on purpose. If calling the widget's
unbind() method fails once, it will fail forever afterwards.
If you prefer a different spelling, move the try/except into the loop, and
break out of the loop in case of an exception:
for seq, id in self.handlerids:
try:
self.widget.unbind(self.widgetinst, seq, id)
except _tkinter.TclError:
break
As for avoiding the exception in the first place, I'm sure figuring out how
IDLE shuts down would be a lot of work, and I honestly don't think it's
necessary. Note that this problem is triggered in a __del__() method; making
sure these are called at a proper time is problematic because the timing
depends on the GC.
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<http://bugs.python.org/issue20167>
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