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Recently I started to use guix as my operating system.

I installed python3 for my user via guix install python3.

python itself is not available in the package repository, which I verified by running guix search python. I want to get started with org-mode and evaluate python snippets (or probably later other code-snippets as well in org-mode).

This is what I have in my init.el:

(org-babel-do-load-languages
 'org-babel-load-languages
 '(
   (emacs-lisp . t)
   (python . t)))

I evaluate the buffer to make sure the changes apply.

So here my actual question:

When I press C-c C-c above the python script, which looks like this:

#+begin_src python :results output
  print("Hello, Seaman!")
#+end_src

I get prompted to evaluate this python expression. I write "yes" and this is what comes out.

/gnu/store/295aavfhzcn1vg9731zx9zw92msgby5a-bash-5.1.16/bin/bash: line 1: python: command not found
[ Babel evaluation exited with code 127 ]

Babel is not able to find python, because I have python3 installed. Changing python to python3 in my init.el didn't help, because it displays the following after evaluating the buffer in the echo area:

Cannot open load file: No such file or directory, ob-python3. Not sure what to do here. Any help is welcome, thanks!

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2 Answers 2

Reset to default
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Set the Python interpreter to python3 by inserting:

  (setq org-babel-python-command "python3")

in your init.el

Emacs uses a default “python” executable, which might no be present on your system. Setting (setq org-babel-python-command "python3") points it to your installed python3 binary.

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(use-package ob-python
  :custom (org-babel-python-command "python3"))


#+begin_src emacs-lisp :exports results :results none
(use-package ob-python
  :custom (org-babel-python-command "python3"))
#+end_src

#+begin_src python :exports results :results output
import sys
print(sys.version)
#+end_src

#+RESULTS:
: 3.11.8 (main, Mar 26 2024, 12:26:07) [GCC 13.2.0]
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7
  • Thanks for the answer. I currently can't find the package in the melpa repository. Where is ob-python located. Also: Why did you assume that I use use-package? It was indeed a good guess. But I never mentioned it, which I probably should have. Commented Apr 7, 2024 at 14:20
  • Note also that I installed ob-ipython, which introduced some conflicts with org-roam, as one can see here:github.com/syl20bnr/spacemacs/issues/12375 Commented Apr 7, 2024 at 17:20
  • ob-python is part of Org mode and is installed in the same place that all the Org mode libraries are installed. use-package has nothing to do with MELPA. All that you need to ensure is that your Emacs can find the ob-python library to load it: IOW, set your load-path variable correctly (if it is not already set up correctly). Commented Apr 8, 2024 at 0:56
  • BTW, you don't have to use use-package. Customizing org-babel-python-command and setting it to "python3" in your init file should be enough. Commented Apr 8, 2024 at 1:05
  • @NickD Could you clarify how to do that? I'm not an advanced emacs user yet. So I did not install Orgmode, therefore I don't know where the Org libraries are installed. Where are those by default? How do you mean without use-package? Could you also provide the exact command? Thanks! Commented Apr 8, 2024 at 19:13

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