I have Lython! I want to make sure that anybody else who wants it can access it, so, unless Mr. Egan objects, I'm hosting it here: http://home.comcast.net/~faulkner612/programming/python/lython.zip I had to patch it a bit because the number of arguments to compiler.ast.Function.__init__ changed between 2.3 and 2.4, when decorators were introduced. I haven't tested it on 2.5 because the last time I upgraded python, my gentoo died. I also took the liberty of adding some features such as primitive interactivity, a '-c code' option, a '-h' option, an rc file '~/.lythonrc.ly', and a '-o file' option which dumps bytecode to file. I've slated developing support for *args, **kwargs, default arguments, += and -= etc., reader macros ala common lisp, classes, try...except...finally, and raise. For the curious, here are some other implementations of lisp in python: http://ibiblio.org/obp/py4fun/lisp/lisp.html http://hkn.eecs.berkeley.edu/~dyoo/python/pyscheme/ http://www.xs4all.nl/~yduppen/site/psyche.html http://www.biostat.wisc.edu/~annis/creations/PyLisp/ These implementations are great, but Lython has macro capabilities, generates python byte code, and demonstrates the use of spark, a fantastic parsing package.