code: def similarity(self, other):
          
          numerator, denominator = sorted((self.value, other.value))
          try:
              ratio = float(numerator) / denominator
          except ZeroDivisionError:
              ratio = 0.0 if numerator else 1.0
          similarity = self.Similarity(ratio)
          return similarity
docs: Get similarity as a ratio of the two numbers.