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

[Andreas Röhler]

Am 29.03.2013 21:10, schrieb Gary Oberbrunner:
> On Fri, Mar 29, 2013 at 11:29 AM, Andreas Röhler <
> address@hidden> wrote:
>
> > IMO org-babel should be able to run source code as is.
> > If an org-mode specific modification is required at such a trivial form,
> > what to expect wrt complex environments?
> >
> > BTW this fails also:
> >
> > #+begin_src python
> > print "Hello, world!"
> > #+end_src python
> >
> > #+RESULTS:
> > : None
>
> As the worg doc says, if you want to capture stdout rather than a value,
> you need :results output.  The default is :results value (which in session
> mode is the last expression executed, and in non-session mode is whatever
> you return().)
>
> I agree it is a little odd, but given how python works it's not clear to me
> how to improve it.

Hi Gary,

if someone wants the value of the last expression returned, it's much simpler 
to write Python/native
language, than cryptic, lately documented org-mode flags.
That's a kind of re-inventing a programming-language, also redundant.

 Specifically, in non-session mode, the python
> interpreter is run as a separate process and fed the input (with some stuff
> around it).  There is no way for python to get "the last value" in
> non-interactive mode,

No? Any program may output any of it's values.

> so instead ob-python wraps your code in a function,
> then calls it, and writes the return value of that function to the temp
> file.  Conversely in session mode, each block is talking to the same
> interactive python interpreter, just what you get if you type 'python' at
> the shell.  So using return() there doesn't make any sense, and wouldn't
> work.

The use of "return" doesn't depend from interactive mode.
It's related to a function.

Seen from org-user, IMO any back-ends interactive mode or not is not of 
interest.
":session" mimics and/or probably uses it, but it would also possible to 
implement it as a file, loading
previous values from a storage.

I don't see any way to make them both behave the same way.
>

Probably most useful at this list is to define which feature/behavior is most 
convenient.
Why people use this mode, what they want to do.

Cheers,

Andreas