code: def hamming_distance(word1, word2):
      
      from operator import ne
      if len(word1) != len(word2):
          raise WrongLengthException('The words need to be of the same length!')
  
      return sum(map(ne, word1, word2))
docs: Computes the Hamming distance.
  
      [Reference]: https://en.wikipedia.org/wiki/Hamming_distance
      [Article]: Hamming, Richard W. (1950), "Error detecting and error correcting codes",
          Bell System Technical Journal 29 (2): 147–160