Method set_exception

Lib/concurrent/futures/_base.py:552–565

Sets the result of the future as being the given exception. Should only be used by Executor implementations and unit tests.

(self, exception)

        self._invoke_callbacks()

    def set_exception(self, exception):
        """Sets the result of the future as being the given exception.

        Should only be used by Executor implementations and unit tests.
        """
        with self._condition:
            if self._state in {CANCELLED, CANCELLED_AND_NOTIFIED, FINISHED}:
                raise InvalidStateError('{}: {!r}'.format(self._state, self))
            self._exception = exception
            self._state = FINISHED
            for waiter in self._waiters:
                waiter.add_exception(self)
            self._condition.notify_all()
        self._invoke_callbacks()

    __class_getitem__ = classmethod(types.GenericAlias)