From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: Python: inputs vs. propagated inputs
Date: Mon, 03 Oct 2016 18:13:45 +0200
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In-Reply-To: <87r38gmiyd.fsf@elephly.net> (Ricardo Wurmus's message of "Mon,
	19 Sep 2016 09:45:14 +0200")
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To: Ricardo Wurmus <rekado@elephly.net>
Cc: Guix-devel <guix-devel@gnu.org>

Hi,

Ricardo Wurmus <rekado@elephly.net> skribis:

> Hartmut Goebel <h.goebel@crazy-compilers.com> writes:
>
>> Hi,
>>
>> I still do not get whether python packages required at run-time need to
>> be inputs or propagated inputs.
>>
>> The part about inputs, native-inputs and propagated-inputs in section
>> "package Reference" explicitly states Python as an example where
>> propagated-inputs are needed. Neither the section about the
>> python-build-system nor the python packaging guidelines give any other
>> hints.
>>
>> In gnu/packages/python.scm there are modules using only inputs (e.g.
>> python-ccm), some are using propagated-inputs (e.g.
>> python-scikit-image), some using both (e.g. python-paramiko). I can not
>> see any clear rule being followed.
>
> I=E2=80=99d say =E2=80=9Cpython-ccm=E2=80=9D is wrong (not only in using =
=E2=80=9Cinputs=E2=80=9D but also in
> its description).
>
> The exception are Python *applications*.  Those usually have a wrapper
> to set the PYTHONPATH appropriately.  For Python modules we need
> propagated-inputs for everything that must be available at runtime.

I concur.

Hartmut: if you have ideas on how to clarify this in the manual, that
would be welcome!  Probably under =E2=80=9CPython Modules=E2=80=9D?

Thanks,
Ludo=E2=80=99.