Perhaps this will do what you want?  When I run org-babel-tangle on the following org file, and then LaTeX the output, the resulting pdf file says: A bit of LATEX code, with the result: 6

* Test org
#+begin_src python 
  x = 6
  f = open('python_results.tex', 'w')
  f.write(str(x))
  f.close()
#+end_src

#+resname:
: None

#+begin_src latex :tangle test_arg_passing
\documentclass{article}
\begin{document}
  A bit of \LaTeX code, with the result: \input{python_results}
\end{document}
#+end_src

HTH,
Tom

Hi Tom
Thanks for sharing this idea. Actually my first (org-babel free) attempt was working like that. However, it becomes fast difficult and complex. On the other hand it solves nicely the problem with the code evaluation in another source block. I just wonder if there is a more comfortable method rather then creating a file.

Thanks again for sharing

Torsten