Using pyenv to switch between two system versions of Python

Question

Is it possible to have pyenv switch between two system versions of Python? I have recently installed Ubuntu 14.04 on my laptop, and it comes shipped with both python2 (v2.7.6) and python3 (v3.4.0) commands. (And the command python links to python2).

After installing pyenv, and typing pyenv versions it shows only one entry with * system, which is apparently the python2 version..

Do I need to install Python3 with pyenv, in order for it to be able to switch between Python2 and Python3? (I hope it is not necessary since I already have it installed)

Note: I know that I could just type python3 prog.py to run Python3, or I could insert an alias python=python3 in my ~/.bashrc but this is not what I am looking for. I am more interested to have programs with the #! /usr/bin/env python shebang to run with the Python3 interpreter..

I suspect you can do this in Ubuntu with update-alternatives. — Daniel Roseman
– Daniel Roseman, Commented Dec 22, 2014 at 13:28

Vladimir Zakharov · Accepted Answer · 2015-04-16 11:32:44Z

3

There is a plugin just for this case: pyenv-register.

answered Apr 16, 2015 at 11:32

Vladimir Zakharov

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