From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ricardo Wurmus <rekado@elephly.net>
Subject: Re: Python: inputs vs. propagated inputs
Date: Mon, 19 Sep 2016 09:45:14 +0200
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To: Hartmut Goebel <h.goebel@crazy-compilers.com>
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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’d say “python-ccm” is wrong (not only in using “inputs” 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.

~~ Ricardo