Pyxmi is a project mainly written in ..., it's free.
Create XML Metadata Interchange files (for importing into modelling tools) from Python source
pyxmi Copyright (c) 2004-2010 Doug Winter [email protected]
This script will generate XMI files from your python source, suitable for importing into UML Modelling tools. I've only tried it with MagicDraw, which is my tool of choice.
This is hugely kludgy and barely past proof-of-concept stage, however I've used it successfully for many years. YMMV.
To use the files in magicdraw, you should use the File->Import menu option.