Comment by eeZi

Lots of incentives for us:

- clean Unicode support which prevents mistakes which used to bite us in production

- native async syntax, compatible with Tornado

- asynchronous generators (yield from a coroutine!)

- pathlib and os.scandir

- type annotations

- matrix multiplication

- chained exceptions

- faster dicts, ordered by default

So many useful features, and with the latest Python 3 releases porting has become really easy thanks to improved compatibility with the old syntax.