Python for the Java Platform
Edit By BS Editor: There are numerous alternative languages implemented for the Java VM. The following features help to separate Jython from the rest:

* Dynamic compilation to Java bytecodes - leads to highest possible performance without sacrificing interactivity.
* Ability to extend existing Java classes in Jython - allows effective use of abstract classes.
* Optional static compilation - allows creation of applets, servlets, beans, ...
* Bean Properties - make use of Java packages much easier.
* Python Language - combines remarkable power with very clear syntax. It also supports a full object-oriented programming model which makes it a natural fit for Javas OO design.

What Does Jython Do Well?

* Prototyping
* Java investigation

Jython 2.5.2 Release Notes

The following features have been added and bugs have been repaired for 2.5.2. For a look at the complete roadmap for Jython along with links for the PEPs and other information, please look at the roadmap:
Bugs Fixed
2.5.2-b2

* [ 1327 ] Classloaders cannot GC, which exhausts permgen (partial bug fix)
* [ 1604 ] PyBuiltinCallable.Info should be serializable
* [ 1397 ] Bugs in PyList and PyJavaType.ListIndexDelegate slice setting
* [ 1503 ] Java constructors should take keyword arguments
* [ 1648,1495,1516 ] Incomplete implementation of pep328 for relative imports
* [ 1611 ] Jython bytecode violated JLS, causing NPE on Suns JVM when using -Xcomp option
* [ 1643 ] Tools subdirectory still exists in trunk
* [ 1455 ] Classes loaded dynamically from sys.path do not have their package defined
* [ 1555 ] Jython does not publish MIME types via JSR 223 (ScriptEngine.getFactory().getMimeTypes() is empty).
* [ 1632 ] cPickle.Unpickler does not allow assignment of find_global
* [ 1395 ] PyList.indexOf() and PyTuple.indexOf() do not function properly you can free download Jython 2.5.2 Bulid 2 now.