Jeff Allen <ja.py@farowl.co.uk> added the comment:

That's a very old Jython.

The yield keyword in Python 2.2 was a __future__ feature. (https://docs.python.org/2.2/ref/yield.html)

I've seen documentation somewhere on wlst that led me to believe 2.7.0 is supplied. Is your argparse.py maybe coming from a 2.7 library? Leading to the hope that there's a 2.7 implementation around?

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Jython tracker <report@bugs.jython.org>
<http://bugs.jython.org/issue2704>
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