original_docstring: 
          This is invoked on forward or cross edges in the graph.
          In an undirected graph this method is never called.
          
docstring: This is invoked on forward or cross edges in the graph.
  In an undirected graph this method is never called.
docstring_tokens: This is invoked on forward or cross edges in the graph . In an undirected graph this method is never called .
code: def forward_or_cross_edge(self, e):
          """
          This is invoked on forward or cross edges in the graph.
          In an undirected graph this method is never called.
          """
          return
code_tokens: def forward_or_cross_edge ( self , e ) : return
short_docstring: This is invoked on forward or cross edges in the graph.
short_docstring_tokens: This is invoked on forward or cross edges in the graph .
comment: """
          This is invoked on forward or cross edges in the graph.
          In an undirected graph this method is never called.
          """