Tulip was 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 12 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 16 March 2014, asyncio is available part of the Python 3.4 branch.