Python: Get relative path from comparing two absolute paths

Question

Say, I have two absolute paths. I need to check if the location referring to by one of the paths is a descendant of the other. If true, I need to find out the relative path

Answer 1

A write-up of jme's suggestion, using pathlib, in Python 3.

from pathlib import Path
parent = Path(r'/a/b')
son = Path(r'/a/b/c/d')            
​
if parent in son.parents or parent==son:
    print(son.relative_to(parent)) # returns Path object equivalent to 'c/d'