We currently use web.py + gevent to run our API where I work. It's really easy to work with since it's so tiny and simple, and since we only need JSON in and ou

We currently use web.py + gevent to run our API where I work. It's really easy to work with since it's so tiny and simple, and since we only need JSON in and out for now, it's perfectly sufficient. Before web.py, we were on a scary Tornado implementation. The API was rewritten to web.py in a week with a minimal delta. We won't be on web.py forever, and gevent sometimes kicks up minor fusses, but I think web.py has given us a nice malleable form that helped us get out of a terrible place, and we can easily hop off once we decide where we want to be. RIP aaronsw.