Re: PYTHONPATH issue analysis - part 3

[Ricardo Wurmus <rekado@elephly.net>]

Ludovic Courtès <ludo@gnu.org> writes:

> I may well have missed something (sorry about that!), but what are “the
> problems related to how Guix is using PYTHONPATH”?
>
> My first reaction is that Guix is not doing anything special with
> PYTHONPATH, and only defining it as documented by upstream.

The problem might be that we are using PYTHONPATH at all.  On other
distributions this is usually not required and thus doesn’t cause any
problems.

As outlined in my first email in this thread, our use of PYTHONPATH in
wrappers seems to not have the desired effect in the presence of
incompatible packages that are *later* in the PYTHONPATH.

We also have problems when PYTHONPATH includes modules for both Python 2
and 3, which happens automatically when these modules are installed into
the same Guix profile.  Since merely installing packages for different
Python versions is not a problem on traditional distros (on my Fedora
workstation I have site-packages directories for 4 different versions of
Python) I think we should do better here.

--
Ricardo

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