fix

CHANGES/526.feature.rst

@@ -0,0 +1 @@
+Allow the scheduler creation without runninmg event loop.

docs/api.rst

@@ -24,9 +24,6 @@ Scheduler
    jobs could be iterated etc.: ``len(scheduler)``, ``for job in
    scheduler``, ``job in scheduler`` operations are supported.
 
-   Class must be instantiated within a running event loop (e.g. in an
-   ``async`` function).
-
    * *close_timeout* is a timeout for job closing after cancellation,
      ``0.1`` by default. If job's closing time takes more than timeout a
      message is logged by :meth:`Scheduler.call_exception_handler`.

tests/test_scheduler.py

@@ -38,6 +38,8 @@ async def coro() -> None:
 
 
 async def test_spawn_non_bound_loop() -> None:
+    loop = asyncio.get_running_loop()
+
     async def coro() -> None:
         await asyncio.sleep(1)
 
@@ -47,8 +49,10 @@ async def coro() -> None:
     job = await scheduler.spawn(coro())
     assert not job.closed
 
-    assert scheduler._failed_task is not None
-    assert scheduler._failed_task.get_loop() is asyncio.get_running_loop()
+    ft = scheduler._failed_task
+    assert ft is not None
+    scheduler_loop = ft.get_loop()  # type: ignore[unreachable]
+    assert scheduler_loop is loop
 
     assert len(scheduler) == 1
     assert list(scheduler) == [job]