def sort_untl(self, sort_structure):
        """Sort the UNTL Python object by the index
        of a sort structure pre-ordered list.
        """
        self.children.sort(key=lambda obj: sort_structure.index(obj.tag))
def sort_untl ( self , sort_structure ) : self . children . sort ( key = lambda obj : sort_structure . index ( obj . tag ) )
Sort the UNTL Python object by the index
        of a sort structure pre-ordered list.