human
Solve the following python programming problem given the following code:
def featurize(* features) : 
    ' Put features into proper MRO order. ' 
    from functools import cmp_to_key 
    def compare_subclass(left, right) : 
        if issubclass (left, right) : 
            return (- 1) 
else : 
            if issubclass (right, left) : 
                return 1 
return 0 
sorted_features = sorted (features, key = cmp_to_key (features)) 
    name = 'FeaturizedClient[{features}]'.format (features = ', '.join ((feature.__name__ for feature in sorted_features))) 
    return type (name, tuple (sorted_features), { 
        
}) 

    
    

    Fix the buggy line: sorted_features = sorted (features, key = cmp_to_key (features))
assistant
#Here is Python program to fix the buggy line: sorted_features = sorted (features, key = cmp_to_key (features))
.

sorted_features = sorted (features, key = cmp_to_key (def compare_subclass())