How to execute Common Lisp code from Python

Question

I would like to execute a Common Lisp (SBCL) code from Python e.g. via shell. Also I need to run a Lisp-library called Shop3 to execute my Lisp code. I tried:

os.system('sbcl && (asdf:load-system "shop3") && (in-package:SHOP-USER) && (load "/Users/kiliankramer/Desktop/Shop-Planer/planner-new")')

But it's not working, it's only starting sbcl but then stop before to load the asdf library "shop3".

Can you tell how to execute my Lisp code or what alternatives I have to run an external Lisp program (including the Lisp library) to execute it?

Thanks in forward. :)

The file I am trying to execute from python is "load "/Users/kiliankramer/Desktop/Shop-Planer/planner-new" but for that I need to load shop3 before. — Kilian Kramer
– Kilian Kramer, Commented May 13, 2021 at 15:12
I'm not familiar with shop. Can it be executed in hylang (github.com/hylang/hy)? — Alexander L. Hayes
– Alexander L. Hayes, Commented May 13, 2021 at 15:18
thanks, I read about Hy, I will try that! :) (ps: SHOP3 - Simple Hierarchical Order Planner is a planner for robotics) — Kilian Kramer
– Kilian Kramer, Commented May 13, 2021 at 15:22
SHOP3 is a system for planning tasks and is written in Common Lisp: github.com/shop-planner/shop3 — Rainer Joswig
– Rainer Joswig, Commented May 13, 2021 at 18:56
See also cl4py, it's supposed to help in this scenario: github.com/marcoheisig/cl4py — Ehvince
– Ehvince, Commented May 13, 2021 at 22:04

sds · Accepted Answer · 2021-05-13 15:46:27Z

5

&& chains shell commands. I.e., it starts sbcl and waits for it to terminate, and if the termination was successful, then it will try to execute (asdf:load-system "shop3") as a shell command (not what you want!)

You need to use sbcl command line arguments:

os.system("sbcl --eval '(asdf:load-system \\"shop3\\")' --eval '(in-package :SHOP-USER)' --load /Users/kiliankramer/Desktop/Shop-Planer/planner-new")

However, you might want to use the more modern interface instead of os.system. It will also avoid the need for escaping quotes &c:

subprocess.run(["sbcl","--eval",'(asdf:load-system "shop3")',
                "--eval",'(in-package :SHOP-USER)',
                "--load","/Users/kiliankramer/Desktop/Shop-Planer/planner-new")

edited May 13, 2021 at 15:46

answered May 13, 2021 at 15:35

sds

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