Custom Python shell for Emacs python-mode

Question

What does it take to replace regular /usr/bin/python with a custom python shell in Emacs' python-mode?

Basically I have a binary /usr/bin/mypython which does some initializations before starting python interpreter prompt, and for all interaction purposes, the resulting interpreter shell is equivalent to /usr/bin/python.

However, if I specify this binary in "python-python-command" (using python.el in Emacs 23.3), I get "Only Python versions >=2.2 and < 3.0 are supported"

Charlie Martin · Accepted Answer · 2011-06-08 02:01:49Z

5

I'm about to read the elisp to check, but I'd bet if you added a --version flag that gave the save results as /usr/bin/python, emacs would be happy.

Update

Here's the code in python.el line 1555 et seq in EMACS 23.3.1:

(defvar python-version-checked nil)
(defun python-check-version (cmd)
  "Check that CMD runs a suitable version of Python."
  ;; Fixme:  Check on Jython.
  (unless (or python-version-checked
          (equal 0 (string-match (regexp-quote python-python-command)
                     cmd)))
    (unless (shell-command-to-string cmd)
      (error "Can't run Python command `%s'" cmd))
    (let* ((res (shell-command-to-string
                 (concat cmd
                         " -c \"from sys import version_info;\
print version_info >= (2, 2) and version_info < (3, 0)\""))))
      (unless (string-match "True" res)
    (error "Only Python versions >= 2.2 and < 3.0 are supported")))
    (setq python-version-checked t)))

What it's doing is running a one-liner

from sys import version_info;
print version_info >= (2, 2) and version_info < (3, 0)

that just prints "True" or "False". Fix your script to handle the -c flag and you should be fine.

Alternatively, you could take the hacker's way out and force the value of python-version-checked to t, and it'll never do the check.

edited Jun 8, 2011 at 2:01

answered Jun 8, 2011 at 1:48

Charlie Martin

113k27 gold badges198 silver badges268 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Yaroslav Bulatov Over a year ago

Thanks for the pointer, looking through file I found another problem -- "-i" flag is hardwired (so removing it from python-python-command-args will not prevent it from being passed)

Charlie Martin Over a year ago

Well, that's why they give you the sources. But that, in particular, sounds like a bug to me; change it and submit a patch.

cjm · Accepted Answer · 2011-06-08 01:57:22Z

1

The easiest way to defeat the check is to lie and tell python-check-version that it's already checked:

(setq python-version-checked t)

answered Jun 8, 2011 at 1:57

cjm

62.2k9 gold badges133 silver badges179 bronze badges

Comments

Andreas Röhler · Accepted Answer · 2012-07-22 18:51:39Z

0

with python-mode.el just do

M-x MY-PYTHON RET

given the Python version is installed

https://launchpad.net/python-mode

answered Jul 22, 2012 at 18:51

Andreas Röhler

4,83216 silver badges20 bronze badges

1 Comment

Bo Persson Over a year ago

Welcome to StackOverflow! I see that you are enthusiastic and have a favorite tool. However, recommending or linking to the same site in all your posts, and 10 times during your first day alone, risks triggering the "potential spam" signals on this site. So take care! Just a friendly advice.

Collectives™ on Stack Overflow

Custom Python shell for Emacs python-mode

3 Answers 3

2 Comments

Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

2 Comments

Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related