code: def get_ancestor_class_names(mention):
      
      span = _to_span(mention)
      class_names = []
      i = _get_node(span.sentence)
      while i is not None:
          class_names.insert(0, str(i.get("class")))
          i = i.getparent()
      return class_names
docs: Return the HTML classes of the Mention's ancestors.
  
      If a candidate is passed in, only the ancestors of its first Mention are
      returned.
  
      :param mention: The Mention to evaluate
      :rtype: list of strings