test_concurrent_futures.py 文件源码

def test_first_completed(self):
        future1 = self.executor.submit(mul, 21, 2)
        future2 = self.executor.submit(time.sleep, 1.5)

        done, not_done = futures.wait(
                [CANCELLED_FUTURE, future1, future2],
                 return_when=futures.FIRST_COMPLETED)

        self.assertEqual(set([future1]), done)
        self.assertEqual(set([CANCELLED_FUTURE, future2]), not_done)