4

I have a python code block in an org-file that when executed results in some error. I was expecting to see that error in the #+RESULTS: block, but it doesn't show up. I have to navigate to the python session buffer in order to see whether the evaluation was successful. More over, when a previous code block is unsuccessful, and the next code block depends on it's results, I can continue executing code without any indications that evaluation is failing (except for missing output).

How can I configure org-babel to display such errors/exceptions in the #+RESULTS: block?

How to reproduce

I have this property set at the top of my org file

#+PROPERTY: header-args :session my_py_session

Sample block

#+BEGIN_SRC python r = some_function_which_results_in_a_trace_back() #+END_SRC #+BEGIN_SRC python x = r*2 #+END_SRC

When I do a C-c on both these blocks, Emacs reports something like Code block evaluation complete (took 0.5 secs) in the mini buffer.

But when I open the python session buffer, I see this error. How can I get this error to show in the #+RESULTS: block?

>>> org_babel_python_eoe Traceback (most recent call last): File "<string>", line 17, in __PYTHON_EL_eval File "/var/folders/7k/r1g1zhmx16gbtm1hbllhhk_w0000gs/T/py3Fvne8", line 18, in <module> File "<string>", line 4, in <module> File "<string>", line 2, in <module> NameError: name 'some_function_which_results_in_a_trace_back' is not defined. Did you mean: 'NameError'? >>> org_babel_python_eoe Traceback (most recent call last): File "<string>", line 17, in __PYTHON_EL_eval File "/var/folders/7k/r1g1zhmx16gbtm1hbllhhk_w0000gs/T/pywWfEwY", line 8, in <module> File "<string>", line 1, in <module> NameError: name 'r' is not defined

What I already tried

#+BEGIN_SRC python :results output try: r = some_error() except Exception as e: print(e) #+END_SRC #+RESULTS: : name 'some_error' is not defined
Improve this question
1
  • FYI, you will get it when using python via emacs-jupyter Commented Oct 17, 2023 at 10:51

2 Answers 2

Reset to default
2

Do you want the whole stacktrace? Or are you fine with just the error message?

Override this function to your heart's content:

(advice-add #'org-babel-python-send-string :override #'my/org-babel-python-send-string) (defun my/org-babel-python-send-string (session body) "Pass BODY to the Python process in SESSION. Return output." (with-current-buffer session (let* ((string-buffer "") (comint-output-filter-functions (cons (lambda (text) (setq string-buffer (concat string-buffer text))) comint-output-filter-functions)) (body (format "\ try: %s except Exception as e: # These are the relevant lines to change. print(e) finally: print('%s')" (org-babel-python--shift-right body 4) org-babel-python-eoe-indicator))) (let ((python-shell-buffer-name (org-babel-python-without-earmuffs session))) (python-shell-send-string body)) ;; same as `python-shell-comint-end-of-output-p' in emacs-25.1+ (while (not (and (python-shell-comint-end-of-output-p string-buffer) (string-match org-babel-python-eoe-indicator string-buffer))) (accept-process-output (get-buffer-process (current-buffer)))) (org-babel-chomp (substring string-buffer 0 (match-beginning 0))))))

You'll also need to change:

#+PROPERTY: header-args :session my_py_session

to

#+PROPERTY: header-args :session my_py_session :results output

Insert the appropriate python code if you want the whole stacktrace.

Improve this answer
2
  • thanks very useful. This really should be in org-babel Commented May 5 at 16:26
  • its not working with :async. btw, seems u need to override org-babel-python-evaluate-session instead of org-babel-python-send-string and use (defun my/org-babel-python-send-string (session body &optional result-type result-params graphics-file) ...) Commented Aug 25 at 4:36
0

as of now, pestctrl code should be modified to

(defun my/org-babel-python-evaluate (orig session body &optional result-type result-params preamble async graphics-file) "This is the :around advice." (let ((body (format "\ try: %s except Exception as e: import traceback traceback.print_exc() " (org-babel-python--shift-right body 3)))) (funcall orig session body result-type result-params preamble async graphics-file))) (advice-add #'org-babel-python-evaluate :around #'my/org-babel-python-evaluate)
Improve this answer

Start asking to get answers

Find the answer to your question by asking.

Ask question

Explore related questions

See similar questions with these tags.