From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: multiple versions
Date: Sat, 16 Jul 2016 22:49:19 +0200
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	(Vincent Legoll's message of "Sat, 16 Jul 2016 15:57:38 +0200")
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To: Vincent Legoll <vincent.legoll@gmail.com>
Cc: help-guix@gnu.org

Hi,

Vincent Legoll <vincent.legoll@gmail.com> skribis:

> I m trying to get python3 & python2 installed for the same user
>
> guix package -i python@2 -i python@3
>
> but that does not look like it will do what I want:
>
> vince@guixsd ~/guix-packages$ guix package -i python@2 python@3
> The following package will be downgraded:
>    python    3.4.3 =E2=86=92 2.7.10
> /gnu/store/7fm1qk703x47qzb9p6xg08cxgb009akz-python-2.7.10
>
> The following package will be upgraded:
>    python    3.4.3 =E2=86=92 3.4.3
> /gnu/store/dsp685maxqc1i6qcib77449g2b6b7qah-python-3.4.3

This is impossible.  A profile can contain at most one package of a
given name.

However, what you can do is create separate profiles:

  guix package -p pytwo -i python@2
  guix package -p pythree -i python@3

=E2=80=A6 or use =E2=80=98guix environment=E2=80=99:

  guix environment --ad-hoc python@2

HTH!

Ludo=E2=80=99.