#NEWLINE# def save( self , filename ) : #NEWLINE# #INDENT# '\n        Save this object to filename.nvl.\n\n        :param filename: The name of the file to save.\n        :type filename: :class:`str`\n\n        :returns: The name of the saved file including extension.\n        ' #NEWLINE# file = open ( ( filename + VertexList . ext ) , 'wb' ) #NEWLINE# scipy . io . mmwrite ( file , self . V ) #NEWLINE# file . close ( ) #NEWLINE# return ( filename + VertexList . ext )