human
Solve the following python programming problem given the following code:
def __cmp__(self, obj) : 
    'Compare Messages, taking into account plural ids' 
    def values_to_compare() : 
        if isinstance (obj, Message) : 
            plural = self.pluralizable 
            obj_plural = obj.pluralizable 
            if (plural and obj_plural) : 
                return (self.id [0], obj.id [0]) 
else : 
                if plural : 
                    return (self.id [0], obj.id) 
else : 
                    if obj_plural : 
                        return (self.id, obj.id [0]) 
return (self.id, obj.id) 
(this, other) = values_to_compare () 
    return cmp (values_to_compare, other) 

    
    

    Fix the buggy line: return cmp (values_to_compare, other)
assistant
#Here is Python code to fix the buggy line: return cmp (values_to_compare, other)
.

return cmp (this, other)