Re: [O] Fwd: run python from org, draft

[John Hendy]

On Fri, Mar 29, 2013 at 10:09 AM, Eric Schulte <address@hidden> wrote:

>> with current
>>
>> GNU Emacs 24.3.1 (i686-pc-linux-gnu, GTK+ Version 2.24.14) of 2013-03-05
>>
>> Org-mode version 7.9.3f (release_7.9.3f-17-g7524ef @
>> MY_PATH/emacs-24.3/lisp/org/)
>>
>> python from org-source seems completely broken.
>>
>> For example:
>>
>> #+BEGIN_SRC python
>> 1+2
>> #+END_SRC
>>
>> #+RESULTS:
>> : None
>>
>>
> Weird. With all the testing we did last week, I'm surprised that this is
> the case with me as well. I'm also getting no results with Org 8.0-pre and
> Emacs 24.3.1.
>

Because of quirks of the python language, when executing outside of a
session, it is necessary to explicitly specify a return.

For example.

    #+begin_src python
      return 1+2
    #+end_src

    #+RESULTS:
    : 3

or

    #+begin_src python :return x
      x = 1+2
    #+end_src

    #+RESULTS:
    : 3

This is clearly stated in the Python documentation on Worg.
http://orgmode.org/worg/org-contrib/babel/languages/ob-doc-python.html

This isn't working for me on Org-8.0 (from that Worg page):

#+begin_src python :session

def foo(x):

  if x>0:

    return x+1

  else:

    return x-1

foo(1)

#+end_src

#+RESULTS:

: None

I tend to agree. I don't/haven't used Python, but having now read the ob-doc-python bit, it seems peculiar/undesirable to have to change indenting, line breaking, and return statements depending on :session or not...

John

 

Thanks,

--
Eric Schulte
http://cs.unm.edu/~eschulte