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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def __postCallAction(self, event):
 """ Calls the "post" callback. @type event: L{ExceptionEvent} @param event: Breakpoint hit event. """

        aThread = event.get_thread()
        retval  = self._get_return_value(aThread)
        self.__callHandler(self.__postCB, event, retval)