I'd like to run two instances of IPython in Emacs at the same time, one with Python 2, and the other Python 3: is it something doable or there's something in the way python.el is designed that would prevent it?
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Yes, that's possible. Add the following code to your init-file (note that you might have to adapt /usr/bin/ipython2 and /usr/bin/ipython to point to appropriate executables for IPython 2 and IPython 3, respectively):
(defun run-python2 ()
(interactive)
"Run IPython with Python 2."
(let ((python-shell-buffer-name "Python 2"))
(run-python "/usr/bin/ipython2 -i" nil t)))
(defun run-python3 ()
"Run IPython with Python 3."
(interactive)
(let ((python-shell-buffer-name "Python 3"))
(run-python "/usr/bin/ipython -i" nil t)))
(global-set-key (kbd "C-c C-2") 'run-python2)
(global-set-key (kbd "C-c C-3") 'run-python3)
With this in place you can launch IPython 2 via C-c C-2 and IPython 3 via C-c C-3. (You can of course change these bindings to your liking.)
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Minor detail: would you happen to also know if it's possible to have different prompt colors for each REPL?– cjauvinMar 13 '15 at 17:25
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@cjauvin You're welcome :) As for your follow-up question: I'm pretty sure it's possible to have different prompt colors for each REPL. However, ANSI colors are not my area of expertise... I suggest you ask a separate question about changing prompt colors ("How to change prompt color in Python REPL?"). If someone can outline a general approach, I can certainly help you integrate the solution into
run-python2andrun-python3.– itsjeydMar 14 '15 at 20:12 -
Thanks! I found a simple solution: simply adding
if sys.version_info[0] < 3: c.PromptManager.in_template = r'{color.Green}In [\#{color.Green}]: 'in my~/.ipython/profile_default/ipython_config.py.– cjauvinMar 15 '15 at 16:04 -
@cjauvin That's great -- a non-Emacs solution, but hey, if it gets the job done... ;)– itsjeydMar 15 '15 at 16:18