Hartmut Goebel <h.goe...@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

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