def add_string(self, key, str1, str2):
        dist = string_dist(str1, str2)
        self.add(key, dist)


# Structures that compose all the information for a candidate match.
Get a flat list of relatives, either upstream or downstream.
dataset/ETHPy150Open beetbox/beets/beets/autotag/hooks.py/Distance.add_string--crossover with--dataset/ETHPy150Open airbnb/airflow/airflow/models.py/BaseOperator.get_flat_relatives