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Re: [O] named python session

From: Andreas Leha
Subject: Re: [O] named python session
Date: Thu, 13 Aug 2015 14:12:32 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (darwin)

Hi Ken,

Ken Mankoff <address@hidden> writes:
> Hi Andreas,
> On 2015-08-12 at 08:06, Andreas Leha <address@hidden> wrote:
>> How do I associate that with the python process in *mypy*?
>> I am asked to start python when I run python-shell-send-region.
> I have set up my system so that Org asks for a buffer name every time 
> =org-edit-special= is called. This may be helpful to you.
>   -k.
> *** Custom Python Session Names
> https://github.com/jorgenschaefer/elpy/issues/383
> I want each python session to optionally have a unique name, so that I
> can run multiple sessions in multiple windows/buffers/directories and
> not have them interact/interfere.
> Here I've copied =elpy-shell-get-or-create-process= from =elpy.el= and
> modified it. I also have to modify =python-shell-get-process-name=.
> This all is fairly easy, except when executing from Org it gets more
> complicated, hence the special case if a function called from
> =org-ctrl-c-ctrl-c=. 
> #+BEGIN_SRC emacs-lisp :results none
>   (defun elpy-shell-get-or-create-process ()
>     "Get or create an inferior Python process for current buffer and return 
> it.
>     Customized by KDM to make dedicated sessions"
>     (let* ((bufname (format "*%s*" (python-shell-get-process-name t)))
>            (proc (get-buffer-process bufname)))
>       (if proc
>           proc
>         (run-python (python-shell-parse-command) t nil) ;; DEDICATED!
>         (get-buffer-process bufname))))
>   (defun python-shell-get-process-name (dedicated)
>     (if (equal this-command 'org-ctrl-c-ctrl-c)
>         (kdm/orig-py-sh-get-proc-name dedicated)
>       (kdm/my-py-sh-get-proc-name dedicated)))
>   (defun kdm/orig-py-sh-get-proc-name (dedicated)
>     "Calculate the appropriate process name for inferior Python process.
>        If DEDICATED is t returns a string with the form
>        `python-shell-buffer-name'[variable `buffer-name']."
>     (let ((process-name
>            (if (and dedicated
>                     (buffer-name))
>                (format "%s[%s]" python-shell-buffer-name (buffer-name))
>              (format "%s" python-shell-buffer-name))))
>       process-name))
>   (defun kdm/my-py-sh-get-proc-name (dedicated)
>     (if (boundp 'py-buf-proc-name)
>         (format "%s" py-buf-proc-name)
>       (setq-local py-buf-proc-name
>                   (format "%s"
>                           (completing-read "Python session name: "
>                                            nil nil nil (buffer-name) nil 
> (buffer-name)))
>                   )))

Thanks a lot for setting me on the right track!  I am quite surprised
(coming from ess as my interface to R) that multiple named sessions
aren't supported out of the box for python.

I use your code now, which in my use-case works great.  Only slight
variation: I set the default python process-name to the session name
using these two functions:

#+BEGIN_SRC emacs-lisp :results none
(defun al-org-babel-get-session (&optional arg info)
  "Return the :session of the current source-code block.
Will return
- nil if :session is given but not named
- \"none\" if no :session argument is specified
- the session name otherwise"
  (if (org-src-edit-buffer-p)
      (let ((beg org-src--beg-marker))
        (with-current-buffer (org-src--source-buffer)
          (goto-char beg)
    (let* ((info (or info (org-babel-get-src-block-info)))
           (params (nth 2 info))
           (session (cdr (assoc :session params))))

(defun kdm/my-py-sh-get-proc-name (dedicated)
  (let* ((sessionname (al-org-babel-get-session))
         (defaultname (or sessionname (if (equalp sessionname "none")
    (if (boundp 'py-buf-proc-name)
        (format "%s" py-buf-proc-name)
      (setq-local py-buf-proc-name
                  (format "%s"
                          (completing-read "Python session name: "
                                           nil nil nil defaultname nil 

Thanks again,

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