How to launch and stop server from Jupyter notebook

[jingxuanlim]

Hello! Just got started on using mesa today. I like it very much.

I do most of my work from a Jupyter notebook. What is the right way to start and stop a server?

Everytime I launch a server, this is what I get:

Interface starting at http://127.0.0.1:8521/
---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)
<ipython-input-2-08d0c78f222e> in <module>
----> 1 server.launch()

~/anaconda3/envs/python37/lib/python3.6/site-packages/mesa/visualization/ModularVisualization.py in launch(self, port, open_browser)
    335             webbrowser.open(url)
    336         tornado.autoreload.start()
--> 337         tornado.ioloop.IOLoop.current().start()

~/anaconda3/envs/python37/lib/python3.6/site-packages/tornado/platform/asyncio.py in start(self)
    197             self._setup_logging()
    198             asyncio.set_event_loop(self.asyncio_loop)
--> 199             self.asyncio_loop.run_forever()
    200         finally:
    201             asyncio.set_event_loop(old_loop)

~/anaconda3/envs/python37/lib/python3.6/asyncio/base_events.py in run_forever(self)
    412         self._check_closed()
    413         if self.is_running():
--> 414             raise RuntimeError('This event loop is already running')
    415         if events._get_running_loop() is not None:
    416             raise RuntimeError(

RuntimeError: This event loop is already running

The server does run, and I can interact with it. However, there's always an error like the one I show above.

I also don't know how to close the server.

Any help appreciated. Thanks!!

[rht]

That's likely because Jupyter itself runs on Tornado, and so it's a nested Tornado process.
For stopping the server, you may try this answer: https://stackoverflow.com/a/8774273 (not sure if it will work). Basically tornado.ioloop.IOLoop.instance().stop().

[jingxuanlim]

I've decided not to pursue this and have been running mesa the recommended way. Thanks though!