do_one_iteration is a coroutine

Author: impact27

ipykernel/eventloops.py

@@ -253,6 +253,10 @@ def process_stream_events(stream, *a, **kw):
         app.mainloop()
 
     else:
+        import asyncio
+        import nest_asyncio
+        nest_asyncio.apply()
+
         doi = kernel.do_one_iteration
         # Tk uses milliseconds
         poll_interval = int(1000 * kernel._poll_interval)
@@ -264,7 +268,11 @@ def __init__(self, app, func):
                 self.func = func
 
             def on_timer(self):
-                self.func()
+                loop = asyncio.get_event_loop()
+                try:
+                    loop.run_until_complete(self.func())
+                except Exception:
+                    kernel.log.exception("Error in message handler")
                 self.app.after(poll_interval, self.on_timer)
 
             def start(self):

setup.py

@@ -70,6 +70,7 @@ def run(self):
         'tornado>=4.2,<7.0',
         'matplotlib-inline>=0.1.0,<0.2.0',
         'appnope;platform_system=="Darwin"',
+        'nest_asyncio',
     ],
     extras_require={
         "test": [