Re: PYTHONPATH issue analysis - part 3

[ludo@gnu.org (Ludovic Courtès)]

Hello,

Ricardo Wurmus <rekado@elephly.net> skribis:

> 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.

It’s not required because Python modules live at a fixed location, no?

How does pip deal with that?  I suppose it needs to modify the search
path somehow.

> 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.

I agree, though I must say that if PYTHONPATH is not up to the task, I’m
not sure what can be done on our side.

Thanks,
Ludo’.