code: def tree_label(self):
          '''render tree label like as `root > child > child`'''
          titles = []
          page = self
          while page:
              titles.append(page.title)
              page = page.parent
          return smart_text(' > '.join(reversed(titles))f tree_label(self):
          '''render tree label like as `root > child > child`'''
          titles = []
          page = self
          while page:
              titles.append(page.title)
              page = page.parent
          return smart_text(' > '.join(reversed(titles)))
docs: render tree label like as `root > child > child`