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bug#27572: simultaneous installation of python2 and python3 fails

From: Ludovic Courtès
Subject: bug#27572: simultaneous installation of python2 and python3 fails
Date: Fri, 07 Jul 2017 13:27:01 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.2 (gnu/linux)

Hello Diego,

Diego Nicola Barbato <address@hidden> skribis:

> When running the command "guix pull && guix package -i address@hidden python"
> instead of installing the latest version of python2 and python3, as it
> used to do until about four weeks ago, guix gives following error
> message (hash values replaced with ...):
>   guix package: error: profile contains conflicting entries for python:out
>   guix package: error:   first entry: address@hidden:out 
> /gnu/store/...-python-2.7.13
>   guix package: error:   second entry: address@hidden:out 
> /gnu/store/...-python-3.5.3

Indeed, Guix now refuses to install two different versions or variants
of the same package since in general they would conflict.

In this particular case, they do not actually conflict, I think, since
address@hidden provides executables prefixed by “3” whereas address@hidden does 

Perhaps we should rename “python” to “python2” or something like that?

In the meantime, I recommend using separate profiles for your Python 2
and Python 3 development environments.  Is that a viable option for you?


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