Issue #20167: Suppress 3.4 specific 'Exception ignored' messages.
Original patch by Tal Einat.
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@ -57,6 +57,13 @@ _modifier_names = dict([(name, number)
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for number in range(len(_modifiers))
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for name in _modifiers[number]])
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# In 3.4, if no shell window is ever open, the underlying Tk widget is
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# destroyed before .__del__ methods here are called. The following
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# is used to selectively ignore shutdown exceptions to avoid
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# 'Exception ignored' messages. See http://bugs.python.org/issue20167
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APPLICATION_GONE = '''\
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can't invoke "bind" command: application has been destroyed'''
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# A binder is a class which binds functions to one type of event. It has two
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# methods: bind and unbind, which get a function and a parsed sequence, as
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# returned by _parse_sequence(). There are two types of binders:
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@ -98,7 +105,12 @@ class _SimpleBinder:
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def __del__(self):
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if self.handlerid:
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self.widget.unbind(self.widgetinst, self.sequence, self.handlerid)
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try:
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self.widget.unbind(self.widgetinst, self.sequence,
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self.handlerid)
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except tkinter.TclError as e:
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if e.args[0] == APPLICATION_GONE:
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pass
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# An int in range(1 << len(_modifiers)) represents a combination of modifiers
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# (if the least significent bit is on, _modifiers[0] is on, and so on).
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@ -227,7 +239,11 @@ class _ComplexBinder:
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def __del__(self):
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for seq, id in self.handlerids:
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self.widget.unbind(self.widgetinst, seq, id)
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try:
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self.widget.unbind(self.widgetinst, seq, id)
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except tkinter.TclError as e:
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if e.args[0] == APPLICATION_GONE:
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break
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# define the list of event types to be handled by MultiEvent. the order is
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# compatible with the definition of event type constants.
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@ -390,8 +406,11 @@ def MultiCallCreator(widget):
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func, triplets = self.__eventinfo[virtual]
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if func:
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for triplet in triplets:
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self.__binders[triplet[1]].unbind(triplet, func)
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try:
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self.__binders[triplet[1]].unbind(triplet, func)
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except tkinter.TclError as e:
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if e.args[0] == APPLICATION_GONE:
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break
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_multicall_dict[widget] = MultiCall
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return MultiCall
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