I’m not going to spend much time describing what gevent is. I think the one sentence overview from its web site does a better job than I could:
gevent is a coroutine-based Python networking library that uses greenlet to provide a high-level synchronous API on top of libevent event loop.
What follows are my experiences using gevent for an internal project here at Mixpanel. I even whipped up some performance numbers specifically for this post!