How can i get a path relative from an other?

I have a path1 relative from a path2 and I want to get this path1 from my script which isn't path1 or path2. I know the absolute path of path2.

Solution

made my own funtion

import pathlib

def convert_path(path, org_path):
    org_path = pathlib.Path(org_path).parent # need the folder where my file is
    for element in path.split(os.path.sep):
        if element == "..":
            org_path = org_path.parent
        else:
            org_path = org_path.joinpath(element)
    return str(org_path)