Guix's python has pip's user dir in its loadpath

[edk]

Dear Guix devs,

While working around this bug:

https://issues.guix.gnu.org/63912

I found that guix's Python will load anything in
.local/lib/python3.10/site-packages/ over any installed package in the
current profile. This makes pip-installed package overshadow guix's.

I'm not sure this is desirable behavior. What I was expecting was for
the host system's python packages to be completely ignored. If I need to
change that, I can explicitely change GUIX_PYTHONPATH.

GUIX_PYTHONPATH is set to:
/home/edouard/.guix-profile/lib/python3.10/site-packages
/gnu/store/avgyacvy2n4x510dpwsf9dzadh7ldnd2-profile/lib/python3.10/site-packages
/home/edouard/.guix-profile/lib/python3.10/site-packages
/home/edouard/.guix-profile/lib/python3.9/site-packages
/home/edouard/.guix-profile/lib/python3.9/site-packages
/home/edouard/.guix-profile/lib/python3.9/site-packages
/home/edouard/.guix-profile/lib/python3.9/site-packages

Therefore loading packages from ~/.local/lib/python3.10/site-packages/
must be hardcoded in the interpreter.

Any thoughts ? Maybe it is a known problem ? If so, my apologies for the
noise.

Cheers,

Edouard.