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usage of guix import / adding a package

From: Zelphir Kaltstahl
Subject: usage of guix import / adding a package
Date: Fri, 17 Jul 2020 00:10:36 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Icedove/68.8.0

Hello Guix Users!

I read on

"The guix import command is useful for people who would like to add a
package to the distribution with as little work as possible—a legitimate
demand. The command knows of a few repositories from which it can
“import” package metadata. The result is a package definition, or a
template thereof, in the format we know (see Defining Packages)."

I've recently tried this, for example for MyPy:

guix import pypi -r mypy

This will result in Guile code printed to my terminal. However, I do not
understand how to make use of that code. I do not understand how I can
load it. For example I tried using the -l argument with guix environment:

guix import pypi -r mypy > additional_file.scm
guix environment --pure --load=additional_file.scm --ad-hoc python@3.8.2
/home/user/dev/Python/additional_file.scm:2:2: error: package: unbound variable
hint: Did you forget `(use-modules (guix packages))'?

So that seems to be the wrong way of trying to make use of it.

Do I need to provide a patch to the project of the Guix package manager
to add this to Guix packages in general and then be able to use it in my
local setup?

I do not find the info, how I can now use MyPy inside an environment or
add it to the available packages on any of the following pages:



makes me think, that perhaps I need to submit it as patch to be able to
use MyPy.

If so, how would I test, whether guix import did its thing correctly? I
could try running MyPy in an environment, but for that I would have to
somehow make use of what guix import gives me, before submitting a patch.

Also, if I need to submit a patch adding the guix import output
somewhere, is there a guide on how to create such a patch for the Guix



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