Jython gets installed by the STAF installer (http://staf.sourceforge.net/index.php).  I believe that it uses Jython v2.1.

On Fri, Aug 1, 2008 at 11:38 AM, Frank Wierzbicki <report@bugs.jython.org> wrote:

Frank Wierzbicki <fwierzbicki@users.sourceforge.net> added the comment:

You won't find an errno.py since in Jython it is implemented in Java
(see src/org/python/modules/errno.java.  How are you installing Jython?
 I have a local version of 2.5a1 that I installed with the installer,
and it imports errno jsut fine...

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