Jython 2.2a1

7/17にリリースされてました。

This release includes many major changes since the last full release:

- new-style classes
- Java Collections integration
- PEP 302 implementation
- iterators
- generators
- __future__ division
- support for running on JDK1.5
- new installer
- a significant number of features to bring Jython in line with CPython
- many, many bugfixes