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

For more information see the official announcement:

Python 3.1 Release

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