On behalf of the Jython development team, I'm pleased to announce that Jython 2.5.1rc1 is available for download: https://sourceforge.net/projects/jython/files/jython/2.5.1rc1/jython_install.... See the http://wiki.python.org/jython/InstallationInstructions for installation instructions. Jython 2.5.1rc1 fixes a number of bugs, including some major errors when using coroutines and when using relative imports. Please see the NEWS file for detailed release notes. Please report any bugs that you find here http://bugs.jython.org. Thanks!