human
Solve the following python programming problem given the following code:
def __repr__(self) : 
    def pp_att(att) : 
        if (att == 'fg') : 
            return FG_NUMBER_TO_COLOR [self.atts [att]] 
else : 
            if (att == 'bg') : 
                return ('on_' + BG_NUMBER_TO_COLOR [self.atts [att]]) 
else : 
                return att 
atts_out = dict (((k, v) for (k, v) in self.atts.items () if v)) 
    return ((''.join (((pp_att (att) + '(') for att in sorted (atts_out))) + (repr (self.s) if PY3 else repr (self.s) [1 :])) + (')' * len (self))) 

    
    

    Fix the buggy line: return ((''.join (((pp_att (att) + '(') for att in sorted (atts_out))) + (repr (self.s) if PY3 else repr (self.s) [1 :])) + (')' * len (self)))
assistant
#Here is Python program to fix the buggy line: return ((''.

return ((''.join (((pp_att (att) + '(') for att in sorted (atts_out))) + (repr (self.s) if PY3 else repr (self.s) [1 :])) + (')' * len (atts_out)))