How can you prefix a Python pathlib.Path with another path?

I have a pathlib.Path('/etc'). If I need to prefix it with pathlib.Path('/mnt/chroot') and do something like:

Path('/mnt/chroot') / Path('/etc')

I just end up with: PosixPath('/etc'), presumably because both Path‘s are absolute paths, and can’t be concatenated.

I can hack together a solution with something like:

Path('/mnt/chroot') / str(Path('/etc')).removeprefix('/')

But that is long-winded, and hackish. Is there a simpler, proper way to do this?

Answer

You can turn Path('/etc') into a relative path with the relative_to method:

Path('/mnt/chroot') / Path('/etc').relative_to('/')