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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Jython tracker <report@bugs.jython.org>
<http://bugs.jython.org/issue1085>
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