Python 3.1 final was released on June 27th, 2009.

Python 3.1 is a continuation of the work started by Python 3.0, the new backwards-incompatible series of Python. Improvements in this release include:

An ordered dictionary type 
Various optimizations to the int type 
New unittest features including test skipping and new assert methods. 
A much faster io module 
Tile support for Tkinter 
A pure Python reference implementation of the import statement 
New syntax for nested with statements
  
http://www.python.org/download/releases/3.1/