How to import a Python module if it is not in the same script folder?

Question

Python

In the root folder there is a module and a folder with a script, tell me, please, is there a simple and elegant solution to import the module into the script?
root_folder/
subfolder/script.py
module.py

Answer 1

In subfolder you create an empty file with the expansion __init__.py (two underscores before and after init) and after that you can import it like this:
import subfolder.script

Answer 2

I solved the problem through environment variables, but as I understand it, the script will not run on another computer, maybe there is a more universal option

Answer 3

import sys
sys.path.append('..')

import module

There is such an option.