Welcome to Jython 2.1 ======================= Important: The format of both compiled ($py.class) and frozen module has changed from version 2.0. It is necesary to delete existing $py.class files and recompile frozen applications when upgrading to Jython-2.1. Other backward incompatible changes include: - The case of module names are now important, even on case ignoring filesystems like windows. This matches CPython behaviour. - The way .zip and .jar files is added to sys.path is changed from 2.1a3. Use the form: sys.path.append("/path/to/file.zip/Lib") to search for modules with the zipped named of "Lib/module.py"