Both Python 2 and 3 in Emacs

Question

I have been using Emacs to write Python 2 code. Now I have both Python 2.6 and 3.0 installed on my system, and I need to write Python 3 code as well.

Here is how the

Answer 1

The answer is yes. If you can distinguish Python 2 from Python 3, then it is a Simple Matter Of Programming to get emacs to do what you want.

(define run-python (&optional buffer)
    (with-current-buffer (or buffer (current-buffer))
        (if (is-python3-p)
              (run-python3)
            (run-python2))))

(define-key python-mode-map (kbd "C-c C-c") #'run-python)

All that's left to do is implement is-python3-p and run-python3 (etc.)