original_docstring: 
          This is invoked when a vertex is encountered for the first time.
          
docstring: This is invoked when a vertex is encountered for the first time.
docstring_tokens: This is invoked when a vertex is encountered for the first time .
code: def discover_vertex(self, v):
          """
          This is invoked when a vertex is encountered for the first time.
          """
          return
code_tokens: def discover_vertex ( self , v ) : return
short_docstring: This is invoked when a vertex is encountered for the first time.
short_docstring_tokens: This is invoked when a vertex is encountered for the first time .
comment: """
          This is invoked when a vertex is encountered for the first time.
          """