tree.py

    def test_get_top_menu_page(self):
        def render_wholetree(tree, parent, level=0):
            yield '%s<ul>' % ('   ' * level)
            for child in tree[parent]:
                yield '%s<li>%s</li>' % ('   ' * (level+1), child)
                if child in tree:
                    yield from render_wholetree(tree, child, level+1)
            yield '%s</ul>' % ('   ' * level)

        def render_tree(pages, parent):
            tree = collections.defaultdict(list)
            for page in pages:
                tree[page.get_parent().id].append(page.id)
            import pprint; pprint.pprint(dict(tree))
            return '\n'.join(render_wholetree(tree, parent.id))

        root = Page.objects.get(url_path='/')
        pages_tree = root.get_descendants()
        tree_html = render_tree(pages_tree, root)
        print(tree_html)