#NEWLINE# def fdiff( self , argindex = 1 ) : #NEWLINE# #INDENT# arg = arg . args [ 0 ] #NEWLINE# if ( argindex == 1 ) : #NEWLINE# #INDENT# return ( S . One / log ( arg ) ) #NEWLINE# #UNINDENT# else : #NEWLINE# #INDENT# raise ArgumentIndexError ( self , argindex )