looking fo documentation for module files

[Gribouillis]

You can use the -S option to disable the import of the site module. Does the following command give the same prefixes?

Output:
$ python3.8 -S -c "import sys; print(sys.prefix, sys.exec_prefix, sys.base_exec_prefix)"
/usr /usr /usr

i only found "/etc/python3.8/sitecustomize.py"

This looks strange too. There should be a copy in the python library. What is the output of

$ python3.8 -S -c "import sitecustomize; print(sitecustomize)"
<module 'sitecustomize' from '/usr/lib/python3.8/sitecustomize.py'>