Another version of Python is called Jython.

“J” is for “Java”.

Imagine a Python written in Java instead of “C”. This is useful, for example, if you develop large and complex systems written entirely in Java and want to add some Python flexibility to them. The traditional CPython may be difficult to integrate into such an environment, as “C” and Java live in completely different worlds and don’t share many common ideas.

Jython can communicate with existing Java infrastructure more effectively. This is why some projects find it usable and needful.

Note: the current Jython implementation follows Python 2 standards. There is no Jython conforming to Python 3, so far.