Actually, this may or may not be much help but you could write a script which created a Java class for each Python class, including method stubs, placing the Python implementation of the method inside the Javadoc

In fact, this is probably pretty easy to knock up in Python.

I worked for a company which undertook a port to Java of a huge Smalltalk (similar-ish to Python) system and this is exactly what they did. Filling in the methods was manual but invaluable, because it got you to really think about what was going on. I doubt that a brute-force method would result in nice code.

Here's another possibility: can you convert your Python to Jython more easily? Jython is just Python for the JVM. It may be possible to use a Java decompiler (e.g. JAD) to then convert the bytecode back into Java code (or you may just wish to run on a JVM). I'm not sure about this however, perhaps someone else would have a better idea.

If you want to translate java code to python you have to translate it manually. Automatic conversion generally does not have the appropriate quality. It looks like there are some tools out e.g. java2python but the author states

The generated Python code is not guaranteed to run, nor is guaranteed to be syntactically valid Python.

Converting a library to another programming language is never an easy task.

If you simply want to use a java library in a application that you want to write in python you could give jython a try.