python3-tornado 4.2.1-1ubuntu3.1 (amd64 binary) in ubuntu xenial

 Tornado is an open source version of the scalable, non-blocking
 web server and tools that power FriendFeed. The FriendFeed application
 is written using a web framework that looks a bit like web.py or
 Google's webapp, but with additional tools and optimizations to take
 advantage of the underlying non-blocking infrastructure.
 .
 This is the Python 3 version of the package.