[mynegation]

This and if you have a large (sometimes legacy) JVM-based (i.e. not just Java, but Scala or Clojure as well) code base that you want to integrate with Python: Hadoop and Weka come to mind.

[KenCochrane]

I see. Can you access/call the java/scala/closure classes from inside of your python code? If so, that is pretty cool.

[benmccann]

Yes.

http://wiki.python.org/jython/WhyJython