Using yaml src block in following python src block

Question

I am trying to use multiple src blocks to explain a yaml config file usage in python. Below is my org file,

#+name: config.yaml
#+begin_src yaml 
name: john
why: check

# below is a dict example
# see it allows comments too
full_name:
  first_name: john
  last_name: smith
#+end_src

Now, let us load this into a python script
#+begin_src python :var input=config.yaml
import yaml

with open(input, 'r') as f:
    cfg = yaml.load(f, Loader=yaml.FullLoader)

print(cfg)
#+end_src

#+RESULTS:

But when I do C-c C-c, I see No org-babel-execute function for yaml!. Can anyone help me identify the error and how to fix it?

Environment: macOs, doom emacs

Answer 1

It looks like yaml as a language is not supported in source code blocks. At least it is not listed in the Languages Section of the org-manual.

The error message usually means that the language is not loaded by org-babel and you have to load it in your emacs config file (.emacs or init.el) like so:

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

Adding an option (yaml . t) did not work for me.

I might be wrong here, so correct me if I'm wrong. I'm curious though, did execution of a yaml source code block ever work for you or is it simply not working in the context above?

Answer 2

Not an exact solution, but I was able to get around with shell src block printing the yaml text which then was consumed by the python src block as a variable.

Here are the contents of my org file now.

#+name: config.yaml
#+begin_src sh :exports results :results output
echo """
name: john
why: check

# below is a dict example
# see it allows comments too
full_name:
  first_name: john
  last_name: smith
"""
#+end_src

Now, let us load this into a python script
#+begin_src python :var zzz=config.yaml :results output
import yaml

x = yaml.load(zzz)
print(x)
#+end_src

 #+RESULTS:
: {'name': 'john', 'why': 'check', 'full_name': {'first_name': 'john', 'last_name': 'smith'}}