Jython

Open-source implementation for JVM written in Java, licensed under Python Software Foundation License. It supports only version 2.7, version 3 is currently being developped.

Differences with CPython:

• Tight integration with JVM.
• Strings are Unicode.
• Does not support extensions for CPython written in C.
• Does not suffer from Global Interpreter Lock.
• Performance is usually lower, though it depends on tests.

Hello World

print "Hello World!"

You can also use Java functions:

from java.lang import System
System.out.println("Hello World!")

External links

• Official website
• Mercurial repository