Re: python sessions

[John Hendy <jw.hendy@gmail.com>]

On Mon, Mar 25, 2013 at 10:40 AM, Eric Schulte <schulte.eric@gmail.com> wrote:
> John Hendy <jw.hendy@gmail.com> writes:
>
>> On Sun, Mar 24, 2013 at 9:38 PM, Nick Dokos <nicholas.dokos@hp.com> wrote:
>>> Eric Schulte <schulte.eric@gmail.com> wrote:
>>>
>>>> >
>>>> > From participating in evaluating code throughout the discussion and
>>>> > catching the comments throughout, I'd say yes, at least in terms of
>>>> > how other babel languages function. In other words =#+begin_src R
>>>> > :session foo= creates an R session named "foo" whereas doing the same
>>>> > with =python= instead of =R= does not yield a named session.
>>>> >
>>>> > From what others experienced, however, the functionality was working
>>>> > correctly (results were persistent across blocks and two differently
>>>> > names blocks created two different sessions), just not named
>>>> > correctly.
>>>> >
>>>>
>>>> See the cond form starting at line 169 in ob-python.el.  Different
>>>> session functionality is used based on the `org-babel-python-mode'
>>>> variable, and on the version of Emacs in use (prior to 24.1 or not).
>>>>
>>>> The branch taken when `org-babel-python-mode' equals 'python is
>>>> certainly broken, as it never saves the name of the newly created
>>>> buffer, so session re-use and use of multiple named sessions probably
>>>> works only when `org-babel-python-mode' equals 'python-mode.
>>>>
>>>
>>> That's me: org-babel-python-mode's value is python, so it's no wonder
>>> it's broken given what Eric says. I'm on emacs 24.3.50 where there is
>>> python.el but no python-mode.el. I tried the "cheap" workaround of
>>> switching the value to python-mode, but that does a (require
>>> 'python-mode) somewhere, so that option is out as well.
>>
>> I'm on Emacs 24.3.1 and have no python-mode.el, either (only
>> python.el). My setup is working correctly (again, with the caveat of
>> not having named sessions).
>>
>
> It sounds like we have the same setup, and the following un-named
> session example does not work for me.  The first code block evaluates
> successfully, but it doesn't appear to be having any impact on the
> default session (e.g., in the *Python* buffer).
>
>     Returns the value of x as expected.
>
>     #+begin_src python :session
>       x = 1
>       return x
>     #+end_src
>
>     #+RESULTS:
>     : 1
>
>     #+begin_src python :session
>       return x
>     #+end_src
>
>     #+RESULTS:
>
> The second code block /should/ have access to the x variable defined
> previous, but instead it throws an error because x is undefined.
>
> Currently I'd say session support for python is completely broken.

Have *any* changes been made related to python recently? See my
mailing list post with reproducible example:
- http://www.mail-archive.com/emacs-orgmode@gnu.org/msg68238.html

This was definitely working for me with a minimal config and starting
with `emacs -Q`. I cannot reproduce that example anymore. Sessions
don't work any longer, named or un-named for me, and we had two data
points (myself and Ista) for whom it worked (at least for named).

I think something was changed that broke it for my working setup.
Might be nice to figure out what that was.

Is there a way to see one's local git history? Not the git log, but
something like what git versions I've been hopping from/to with each
successive pull? I could try and see what I was at on 3/20 when I
posted that and when I last pulled? I see a change related to
ob-python from Bastien on 3/19... perhaps I could switch to a commit
prior to that and try again?


John

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