Importing modules from a neighbouring folder in Python

Question

I have put the question in the figure below:

EDIT The question put next to the figure is:

How do I make script_A1 import a function from script_B2?

Similar questions have been asked before. But most answers suggest to add the module/script/package(whatever) to the PATH variable. For example:

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

But adding the module to the PATH variable just feels so wrong. I do not want to alter my system in any way. When my application closes, I want my Python environment to be clean and 'untouched'. I'm afraid that adding uncontrolled modules to the PATH variables on my system will cause headaches later on.

Thank you for helping me out :-)

Answer 1

You can use a trick of adding the top folder to path:

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

You can also use imp.load_source if you prefer.