test.py

class Node:
    def __init__(self, parent, name):
        self.parent = parent
        self.name = name

    def get(self, name):
        return Node(self, ".".join([self.name, name]))

    def root(self):
        node = self

        while node.parent != None:
            node = node.parent

        return node

a = Node(None, "a")
b = a.get("b")
c = b.get("c")
d = c.get("d")

droot = d.root()

if droot != a or droot.name != "a":
    print("something went wrong!")
else:
    print("all good")