Migrating from python 3.4 to 3.5 error #498

Is everything good here?
http://stackoverflow.com/questions/42546099/python-asyncio-migrate-from-3-4-to-3-5

I met the problem while migrating my script from python 3.4 to 3.5 or 3.6+. It uses asyncio and works good on 3.4 python but when I start it with python3.5+ I got error: RuntimeError: Cannot run the event loop while another loop is running.