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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def find(self, path, mode='node'):
 """ Find the closest node or path to an the arbitrary path that is supplied down the tree from the given node. The mode argument may be either 'node' or 'path' which determines the return type. """

        path = path.split('.') if isinstance(path, str) else list(path)
        item = self

        for child in path:
            escaped_child = sanitize_identifier(child, escape=False)
            matching_children = [c for c in item.children
                                 if child.endswith(c) or escaped_child.endswith(c)]
            matching_children = sorted(matching_children, key=lambda x: -len(x))
            if matching_children:
                item = item[matching_children[0]]
            else:
                continue
        return item if mode == 'node' else item.path