#NEWLINE# def constants( self ) : #NEWLINE# #INDENT# ':see: Expression.constants()' #NEWLINE# if isinstance ( function_constants . function , AbstractVariableExpression ) : #NEWLINE# #INDENT# function_constants = set ( ) #NEWLINE# #UNINDENT# else : #NEWLINE# #INDENT# function_constants = self . function . constants ( ) #NEWLINE# #UNINDENT# return ( function_constants | self . argument . constants ( ) )