* org-mode, python and unicode
@ 2016-05-18 8:10 Daniele Pizzolli
2016-05-19 22:36 ` William Henney
0 siblings, 1 reply; 2+ messages in thread
From: Daniele Pizzolli @ 2016-05-18 8:10 UTC (permalink / raw)
To: emacs-orgmode
Hello,
I found some problems and workarounds in the use of python (version
2) and org-mode. This applies to:
#+BEGIN_EXAMPLE
Org-mode version 8.3.4 (8.3.4-60-g19cf68-elpa @ /home/vagrant/.emacs.d/elpa/org-20160516/)
#+END_EXAMPLE
Some workaround are not complete, and suggestions are welcome!
Best,
Daniele
* python
** load python support for babel
#+BEGIN_SRC emacs-lisp
(org-babel-do-load-languages
'org-babel-load-languages
'((python . t)))
#+END_SRC
#+RESULTS:
: ((python . t))
** passing utf-8 strings to python
#+NAME: unicode_str
#+BEGIN_EXAMPLE
“this string is not ascii!”
#+END_EXAMPLE
#+NAME: error-in-passing-var
#+BEGIN_SRC python :var data=unicode_str
return data
#+END_SRC
#+RESULTS: error-in-passing-var
Will result in the following message in the buffer =*Org-Babel Error Output*=:
#+BEGIN_EXAMPLE
File "<stdin>", line 3
SyntaxError: Non-ASCII character '\xe2' in file <stdin> on line 3, but no encoding declared; see http://www.python.org/peps/pep-0263.html for details
#+END_EXAMPLE
** passing utf-8 strings to python with workaround
A workaround is to use =:preamble= with wthe value =# -*- coding:utf-8 -*-=
#+NAME: ok-in-passing-var
#+BEGIN_SRC python :preamble "# -*- coding: utf-8 -*-" :var data=unicode_str
return data
#+END_SRC
#+RESULTS: ok-in-passing-var
: “this string is not ascii!”
** passing utf-8 tables to python
#+NAME: unicode_table
| key | value |
|-----+-----------------------------|
| 1 | “this string is not ascii!” |
#+NAME: error-in-passing-table
#+BEGIN_SRC python :var data=unicode_table
return data
#+END_SRC
Will result in the following message in the buffer =*Org-Babel Error Output*=:
#+BEGIN_EXAMPLE
File "<stdin>", line 3
SyntaxError: Non-ASCII character '\xe2' in file <stdin> on line 3, but no encoding declared; see http://www.python.org/peps/pep-0263.html for details
#+END_EXAMPLE
** returning utf-8 tables from python
#+NAME: error-in-returnig-table
#+BEGIN_SRC python :preamble "# -*- coding: utf-8 -*-" :var data=unicode_table :colnames yes
return data
#+END_SRC
Will output the ascii text with escape sequence for unicode
characters. I still do not know the best workaround
#+RESULTS: error-in-returnig-table
| key | value |
|-----+---------------------------------------------------|
| 1 | \xe2\x80\x9cthis string is not ascii!\xe2\x80\x9d |
Please note that the single cell is correctly returned:
#+NAME: returnig-table-cell
#+BEGIN_SRC python :preamble "# -*- coding: utf-8 -*-" :var data=unicode_table
return data[0][1]
#+END_SRC
#+RESULTS: returnig-table-cell
: “this string is not ascii!”
** Undocumented parts
I did not found out:
- how to get the table headers in python
- in general, the magic that org-mode does to pass and retrieve data
structures to various languages is lacking documentation
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: org-mode, python and unicode
2016-05-18 8:10 org-mode, python and unicode Daniele Pizzolli
@ 2016-05-19 22:36 ` William Henney
0 siblings, 0 replies; 2+ messages in thread
From: William Henney @ 2016-05-19 22:36 UTC (permalink / raw)
To: Daniele Pizzolli; +Cc: emacs-org
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Hi Daniel
On Wed, May 18, 2016 at 3:10 AM, Daniele Pizzolli <dan@toel.it> wrote:
>
> I did not found out:
>
> - how to get the table headers in python
>
>
I can answer this small part. Use the (counter-intuitively named)
":colnames no" header argument, see [[info:org#colnames]]. The default
behavior is ":colnames nil", which supposedly strips off the table headers
on input and reattaches them on output. But that doesn't work for me with
python - they are stripped off, but not reattached.
Will
--
Dr William Henney, Instituto de Radioastronomía y Astrofísica,
Universidad Nacional Autónoma de México, Campus Morelia
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