gevent is a coroutine -based Python networking library that uses greenlet to provide a high-level synchronous API on top of the libev or libuv event loop.

Features include:

Fast event loop based on libev or libuv.

Lightweight execution units based on greenlets.

API that re-uses concepts from the Python standard library (for examples there are events and queues).

Cooperative sockets with SSL support

Cooperative DNS queries performed through a threadpool, dnspython, or c-ares.

Monkey patching utility to get 3rd party modules to become cooperative

TCP/UDP/HTTP servers

Subprocess support (through gevent.subprocess)

Thread pools