so Autobahn has supported Python 2 and 3 since the very beginning, and we support running on either Twisted or asyncio on both Python versions.
This flexibility has proven nice and useful … in the past.
Given that Python will now finally retire Python 2 on 2020/01/01
and that Twisted will retire Python 2 support also soonish, we need to decide how we handle this.
Of course the straightforward option would be: follow Python and Twisted, and retire Python 2 support in new versions of Autobahn entirely.