def set_exception(self, exception):
        with self._condition:
            self._exception = exception
            self._state = FINISHED
            for waiter in self._waiters:
                waiter.add_exception(self)
            self._condition.notify_all()
        self._invoke_callbacks()
Sets the result of the future as being the given exception.
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/concurrent/concurrent/futures/_base.py/Future.set_exception