def most_distinctive_terms(self, fieldid, number=5, prefix=None):
        
        return nlargest(number, ((tf * (1.0/df), token)
                                 for token, df, tf
                                 in self.iter_prefix(fieldid, prefix)))
Returns the top 'number' terms with the highest ``tf*idf``
dataset/ETHPy150Open dokipen/whoosh/src/whoosh/reading.py/IndexReader.most_distinctive_terms