How to use the cgroupspy.trees.Tree function in cgroupspy

def _create_cgroup(self, path):
        """
        Create the specified cgroup.

        :param path: The path of the cgroup to create.
        E.g. cpu/mygroup/mysubgroup
        :return: the Node associated with the created cgroup.
        :rtype: cgroupspy.nodes.Node
        """
        node = trees.Tree().root
        path_split = path.split(os.sep)
        for path_element in path_split:
            # node.name is encoded to bytes:
            # https://github.com/cloudsigma/cgroupspy/blob/e705ac4ccdfe33d8ecc700e9a35a9556084449ca/cgroupspy/nodes.py#L64
            name_to_node = {x.name.decode(): x for x in node.children}
            if path_element not in name_to_node:
                self.log.debug("Creating cgroup %s in %s", path_element, node.path.decode())
                node = node.create_cgroup(path_element)
            else:
                self.log.debug(
                    "Not creating cgroup %s in %s since it already exists",
                    path_element, node.path.decode()
                )
                node = name_to_node[path_element]
        return node