original_docstring: 
          This is invoked on back or cross edges for directed graphs and cross edges
          for undirected graphs.
          
docstring: This is invoked on back or cross edges for directed graphs and cross edges
  for undirected graphs.
docstring_tokens: This is invoked on back or cross edges for directed graphs and cross edges for undirected graphs .
code: def non_tree_edge(self, e):
          """
          This is invoked on back or cross edges for directed graphs and cross edges
          for undirected graphs.
          """
          return
code_tokens: def non_tree_edge ( self , e ) : return
short_docstring: This is invoked on back or cross edges for directed graphs and cross edges
  for undirected graphs.
short_docstring_tokens: This is invoked on back or cross edges for directed graphs and cross edges for undirected graphs .
comment: """
          This is invoked on back or cross edges for directed graphs and cross edges
          for undirected graphs.
          """