problem in import module from other folder

[Gribouillis]

I don't add the path permanently to $PATH because I don't use them very frequently.

Dont mistake the Module Search Path with the environment variable $PATH, they are completely different things.

What you could do is put them in a package that would be permanently available for example

Output:
myPython
└── packages
    └── infrequent
        ├── __init__.py  # add this file to make infrequent a package (an empty file suffices)
        ├── score_oralsOMR.py
        └── ... others.py

Then you permanently add '/home/pedro/myPython/packages/' to sys.path by editing your usercustomize.py module for example, then you can write in your scripts

from infrequent import score_oralsOMR

As for module usercustomize, if it doesn't already exist, create usercustomize.py in the directory returned by the command

Output:
python -c "import site; print(site.getusersitepackages())"

In usercustomize.py, add the lines

import site
site.addsitedir('/home/pedro/myPython/packages')