Terminate async gen example caller to avoid (benign) errors in console output

examples/asynchronous_generators.py

@@ -1,39 +1,41 @@
+from typing import AsyncIterator
 from itertools import repeat
+
 import trio
 import tractor
 
-tractor.log.get_console_log("INFO")
 
+async def stream_forever() -> AsyncIterator[int]:
 
-async def stream_forever():
     for i in repeat("I can see these little future bubble things"):
-        # each yielded value is sent over the ``Channel`` to the
-        # parent actor
+        # each yielded value is sent over the ``Channel`` to the parent actor
         yield i
         await trio.sleep(0.01)
 
 
 async def main():
 
-    # stream for at most 1 seconds
-    with trio.move_on_after(1) as cancel_scope:
+    async with tractor.open_nursery() as n:
 
-        async with tractor.open_nursery() as n:
+        portal = await n.start_actor(
+            'donny',
+            enable_modules=[__name__],
+        )
 
-            portal = await n.start_actor(
-                'donny',
-                enable_modules=[__name__],
-            )
+        # this async for loop streams values from the above
+        # async generator running in a separate process
+        async with portal.open_stream_from(stream_forever) as stream:
+            count = 0
+            async for letter in stream:
+                print(letter)
+                count += 1
 
-            # this async for loop streams values from the above
-            # async generator running in a separate process
-            async with portal.open_stream_from(stream_forever) as stream:
-                async for letter in stream:
-                    print(letter)
+                if count > 50:
+                    break
 
-    # we support trio's cancellation system
-    assert cancel_scope.cancelled_caught
-    assert n.cancelled
+        print('stream terminated')
+
+        await portal.cancel_actor()
 
 
 if __name__ == '__main__':