diff --git a/Lib/test/test_asyncio/test_tasks.py b/Lib/test/test_asyncio/test_tasks.py index 609ccdbfdb2b289..110cd0936c007c9 100644 --- a/Lib/test/test_asyncio/test_tasks.py +++ b/Lib/test/test_asyncio/test_tasks.py @@ -2733,6 +2733,18 @@ async def main(): self.assertEqual(name, "example") await t + def test_eager_start_true_no_loop(self): + # gh-154695: eager_start must use the resolved loop, not loop=None. + async def asyncfn(): + return 42 + + async def main(): + t = self.__class__.Task(asyncfn(), eager_start=True) + self.assertTrue(t.done()) + self.assertEqual(await t, 42) + + asyncio.run(main(), loop_factory=asyncio.EventLoop) + def test_eager_start_false(self): name = None diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2026-07-25-17-35-14.gh-issue-154695.aQWLLv.rst b/Misc/NEWS.d/next/Core_and_Builtins/2026-07-25-17-35-14.gh-issue-154695.aQWLLv.rst new file mode 100644 index 000000000000000..6e147cf7f31a882 --- /dev/null +++ b/Misc/NEWS.d/next/Core_and_Builtins/2026-07-25-17-35-14.gh-issue-154695.aQWLLv.rst @@ -0,0 +1,2 @@ +Fix :class:`asyncio.Task` raising :exc:`AttributeError` when created with +``eager_start=True`` and no explicit *loop* argument. diff --git a/Modules/_asynciomodule.c b/Modules/_asynciomodule.c index 9c29eb8232ed3f9..0cd41d0b4c4d0dc 100644 --- a/Modules/_asynciomodule.c +++ b/Modules/_asynciomodule.c @@ -2364,7 +2364,9 @@ _asyncio_Task___init___impl(TaskObj *self, PyObject *coro, PyObject *loop, _PyObject_SetMaybeWeakref((PyObject *)self); #endif if (eager_start) { - PyObject *res = PyObject_CallMethodNoArgs(loop, &_Py_ID(is_running)); + // gh-154695: loop may be None here, future_init() resolved it into task_loop. + PyObject *res = PyObject_CallMethodNoArgs(self->task_loop, + &_Py_ID(is_running)); if (res == NULL) { return -1; }