3

I've tried this and this with no success, in both cases when I C-c C-p I still get python2.7..

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You have to change the python interpreter that emacs is using with the command

(setq python-shell-interpreter "python3")

you should set it to whatever the command is that you want. It can also be ipython in which case you would need 

(setq python-shell-interpreter "ipython"
      python-shell-interpreter-args "-i")

where the ipython command calls the python 3.5 version of ipython

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2

The above solution did not work for me. What did work was:

(setq py-shell-name "python3")

According to py-choose-shell in python-mode.el, it chooses the shell via the following methods:

This does the following:

  • look for an interpreter with `py-choose-shell-by-shebang'
  • examine imports using `py--choose-shell-by-import'
  • look if Path/To/File indicates a Python version
  • if not successful, return default value of `py-shell-name'
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