question on Python package path under GNU Guix and GUIX_PYTHONPATH env variable

[Andy Tai]

Hi, I have a question about python under GNU Guix.  I am not a
frequent python user.
Supposedly Guix sets this environment variable GUIX_PYTHONPATH for
python library search paths, like say PATH for the paths for searching
for binary executable in a Guix profile.

However, when I do

guix shell --pure python-numpy

and in the shell if I do

export


I expect to see GUIX_PYTHONPATH defined.   But I don't see it.  Is
this expected?

Thanks for info