Hi Mateus!

Indeed, when using virtualenv's numpy, this

    python3 -c 'import numpy'

fails with the error you posted. I seem to have been able to make numpy
happy by instead running Python like

    LD_LIBRARY_PATH=/gnu/store/8qv5kb2fgm4c3bf70zcg9l6hkf3qzpw9-zlib-1.2.11/lib/ python3 -c 'import numpy'

If you use the `--container` and `--emulate-fhs` options to
`guix shell`, it is also possible to instead do

    LD_LIBRARY_PATH=/usr/lib/ python3 -c 'import numpy'

The `libz` guix package still needs to be included among the packages
passed to `guix shell` in this last case.

Also, given you're using virtualenv, you might find the `--network`
option to `guix shell` useful :)

I hope there isn't any dumb mistake in my solution... Good luck :)

Wojtek

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On Tue, 29 Nov 2022 16:42:14 +0000
mprodrigues@posteo.net wrote:

> Hello,
> 
> I've been using a guix shell with a couple of python packages and it 
> works fine,
> however I'd also like to keep the option of using a virtualenv if 
> possible, the
> thing is I'm having problem running modules like numpy, that depend on 
> non
> python dependencies. The error I get when I try to load numpy in a venv 
> is:
> 
> Importing the numpy C-extensions failed. This error can happen for many 
> reasons,
> often due to issues with your setup or how NumPy was installed.
> 
> and in the end:
> 
> Original error was: libz.so.1: cannot open shared object file: No such 
> file or
> directory
> 
> I have tried installing zlib directly, also tried to add my default 
> profile libs
> path to the venv PATH, but to no avail until now.  How can I solve this? 
> Or
> maybe someone can point me in the direction that I have to take to 
> properly
> debug this.
> 
> Best regards,
> Mateus Rodrigues
>