python-string-similarity/similarity/string_distance.py

class StringDistance:

    def distance(self, s0, s1):
        raise NotImplementedError()


class NormalizedStringDistance(StringDistance):

    def distance(self, s0, s1):
        raise NotImplementedError()


class MetricStringDistance(StringDistance):

    def distance(self, s0, s1):
        raise NotImplementedError()