Re: Setting up a python environment

[Julien Lepiller]

Le 11 mai 2020 10:09:40 GMT-04:00, Roy Lemmon <address@hidden> a écrit :
>Thanks sirgazil. That is very helpful.
>
>Yes, it might be that astropy has many dependencies.
>
>I will take a look at that video and also get a better handle on
>packaging.
>
>Cheers
>Roy.
>
>
>On Mon, 11 May 2020, 14:56 sirgazil, <address@hidden> wrote:
>
>>  ---- On Mon, 11 May 2020 07:34:09 -0500 Roy Lemmon
><address@hidden>
>> wrote ----
>>  > Hi,
>>  >
>>  > I would like to ask about the general philosophy of setting up a
>python
>>  > environment under guix.
>>  >
>>  > For other linux systems I have used pip to manage python packages
>and
>>  > libraries.
>>  >
>>  > In guix is the idea that guix replaces pip for managing packages
>and
>>  > libraries ?
>>
>> I think so, yes, ideally.
>>
>>  > So I would create a python-package for any missing python
>>  > packages ?
>>
>> Yes.
>>
>>  > In the guix package lists, I can find many of the python
>>  > libraries but there are a few missing that I would like, eg.
>astropy -
>> an
>>  > astronomy analysis library. So should I be creating a guix package
>for
>> that
>>  > rather than installing with pip ?
>>
>> That's the idea, yes: to have all Python packages available in Guix.
>That
>> way, if your projects depend on Python packages and non-Python
>packages,
>> you can specify all the requirements of your projects conveniently in
>a
>> Guix manifest file (instead of having a requirements file for pip and
>> another requirements file for some OS package manager, and possibly,
>> another requirements file for another programmnig language used in a
>> project).
>>
>> In practice, though, your projects could require many packages that
>are
>> not yet in Guix. For example, astropy could depend on other packages
>that
>> are not available, and those packages depend on other packages that
>are not
>> available, and so on. To package them all would be a job in itself,
>and you
>> would not have time to work on your project.  So, depending on your
>> specific case, you might still need to use Python virtual
>environments and
>> pip to get things done. For the latter you can use Python's venv, or
>> poetry, or other tools that are already available in Guix for
>managing
>> Python projects and environments.
>>
>> I recommend to watch the https://guix.gnu.org/videos/ for an
>introduction
>> to packaging.
>>
>>
>>
>>
>> ---
>> https://sirgazil.bitbucket.io/
>>
>>
>>
>>

Guix also has a cool import feature that might help you package missing 
paekages. You thould try 'guix import pypi -r astropy'.