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Willem Broekema <>


LLGPL (Lisp Lesser GNU Public License)

CLPython - an implementation of Python in Common Lisp

CLPython is an open-source implementation of Python written in Common Lisp. With CLPython you can run Python programs in a Lisp environment. Libraries written in Lisp are available to Python code, and Python libraries can be accessed by Lisp code. Also Python and Lisp code can be mixed.

For rough documentation, please see the Introduction and Manual on

To install using QuickLisp: (ql:quickload "clpython") (require ASDF 3.3 or higher).

CLPython is developed by Willem Broekema and is released as open source under the LLGPL. The project was started in 2006, and is since 2013 not under active development anymore.

See the build status on Travis-CI, and the coverage status on Coveralls:

Common Lisp ImplementationBuild + Test Status
ABCL 1.5.0Build StatusFails due to ClassCastException: StandardObject cannot be cast to LispClass
Allegro CL 10.1Build Status
Clozure CL 1.11Build Status
CLISP 2.49Build StatusFails due to stack overflow
ECL 16.1.3Build Status
LispWorks 6.1.1Manually verified
SBCL 1.5.4Build Status Coverage Status

Dependencies (4)

  • cl-fad
  • closer-mop
  • cl-yacc
  • ptester

Dependents (0)

    • GitHub
    • Quicklisp