code: def levenshtein_distance(str_a, str_b):
      
      len_a, len_b = len(str_a), len(str_b)
      if len_a > len_b:
          str_a, str_b = str_b, str_a
          len_a, len_b = len_b, len_a
      current = range(len_a + 1)
      for i in range(1, len_b + 1):
          previous, current = current, [i] + [0] * len_a
          for j in range(1, len_a + 1):
              add, delete = previous[j] + 1, current[j - 1] + 1
              change = previous[j - 1]
              if str_a[j - 1] != str_b[i - 1]:
                  change += + 1
              current[j] = min(add, delete, change)
      return current[len_a]
docs: Calculate the Levenshtein distance between string a and b.
  
      :param str_a: String - input string a
      :param str_b: String - input string b
      :return: Number - Levenshtein Distance between string a and b