gen_test.py 文件源码

def test_replace_yieldpoint_exception(self):
        # Test exception handling: a coroutine can catch one exception
        # raised by a yield point and raise a different one.
        @gen.coroutine
        def f1():
            1 / 0

        @gen.coroutine
        def f2():
            try:
                yield f1()
            except ZeroDivisionError:
                raise KeyError()

        future = f2()
        with self.assertRaises(KeyError):
            yield future
        self.finished = True