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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 __call(self):
 """ Calls the callback method """

        try:
            if self.__callback is not None:
                self.__callback(self.__successes, self.__errors)
        except Exception as ex:
            self.__logger.exception("Error calling back count down "
                                    "handler: %s", ex)
        else:
            self.__called = True