human
Solve the following python programming problem given the following code:
@ property 
def normalized_buckets(self) : 
    buckets = self.raw_buckets 
    if b.aggregation.keyed : 
        def _add_key(key, bucket) : 
            bucket ['key'] = key 
            return bucket 
return [_add_key (k, b) for (k, b) in buckets.items ()] 
else : 
        def _add_key(bucket) : 
            key = '{}-{}'.format (bucket.get ('from', '*'), bucket.get ('to', '*')) 
            bucket ['key'] = key 
            return bucket 
return [_add_key (b) for b in buckets] 

    
    

    Fix the buggy line: if b.aggregation.keyed :
assistant
#Here is Python code to fix the buggy line: if b.

if self.aggregation.keyed :