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bug#27572: simultaneous installation of python2 and python3 fails

From: Diego Nicola Barbato
Subject: bug#27572: simultaneous installation of python2 and python3 fails
Date: Mon, 10 Jul 2017 17:59:34 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.2 (gnu/linux)

Hello Ludo,

Thanks for your reply.

address@hidden (Ludovic Courtès) writes:

> 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 not.
> 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?

Using separate profiles seems like a reasonable option. I also tried
using guix environment with the --ad-hoc flag.

> Thanks,
> Ludo’.



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