Tulip is a Python project aiming to add asynchronous I/O support to the Python 3 standard library. The reference implementation is the Tulip project. Its name has changed for asyncio.
On the 12th December, 2012, asyncio was proposed as an enhancement of Python.
"As of October 20th 2013, the asyncio package has been checked into the Python 3.4 repository and released with Python 3.4-alpha-4, with "provisional" API status."
As of the 16th March, 2014, asyncio is available part of the Python 3.4 branch.