def most_distinctive_terms(self, fieldid, number=5, prefix=None):
        """Returns the top 'number' terms with the highest ``tf*idf``
        scores as a list of (score, text) tuples.
        """
        
        return nlargest(number, ((tf / (1.0/df), token)
                                 for token, df, tf
                                 in self.iter_prefix(fieldid, prefix)))
dataset/ETHPy150Open dokipen/whoosh/src/whoosh/reading.py/IndexReader.most_distinctive_terms/operator `*` -> `/`