Cross platform Python file handleing

Question

I have three python file and two text files file in respective folders.

• A.py in folder A, which is the main file
• B.py and b_results.txt in folder B
• C.py and c_results.txt in folder C

Intentions:

1. File A.py will call a Class b_class() in B.py (via from B import b_class)
2. b_class will work with text form b_results.txt and a call Class c_class in C.py (b.py has top level import from C import * )
3. c_class need some data form c_results.txt it dose its thing and returns value to b_class
4. Then b_class will DoSomeThing with both results and spit it to A.py. Where the results are displayed.

Prob: What's happening is each file is being executing perfectly in it's respective folder. C.py is reading c_results.txt and B.py is reading b_results.txt since c_class is called as an instance in b_class. c_class is looking for file c_results. txt in folder B.

Tried methods:

• Relative paths in [OS, phatlib] : No such file or directory: 'c_results.txt'
• Absolute paths in [OS, phatlib] : Not working in other machine (Windows/ Mac/ linux)
• init.py (included .py and .txt) : Not working in cross platform

Pictorial representation of the struggle

I understand it's calling an instance of a class but I'm not able to find a method to make it work in a professional way (by this i mean writing everything in one.py and copy the respective contents to the cwd() then remove() them before exit).

Can someone tell me how it's done.