I think async and aiohttp are game changes for Python 3.5. After working with Twisted callbacks for over a decade, it's a pleasure to write async code that does not use the callback approach (granted Twisted is a mature environment with lots to offer).
I've switched to Python3.5 and aiohttp for all new web service applications. The coding style is clean, enjoyable to write, and easy to debug.
Plus, I've never once been stymied for speed. I know there's applications out there where people expect to to be handling zillions of connections -- but the bulk of my use cases think 100 transactions per second is a huge through-put, and aiohttp handles that with ease.
Have you used eventlet or gevent? I thought they were game changers. Gevent has been working very well for me for quite a while, without callback hell.
I've switched to Python3.5 and aiohttp for all new web service applications. The coding style is clean, enjoyable to write, and easy to debug.
Plus, I've never once been stymied for speed. I know there's applications out there where people expect to to be handling zillions of connections -- but the bulk of my use cases think 100 transactions per second is a huge through-put, and aiohttp handles that with ease.