code: def diff(s1, s2):
      
      return levenshtein(s1, s2) / max(len(s1), len(s2))
docs: Return a normalised Levenshtein distance between two strings.
  
      Distance is normalised by dividing the Levenshtein distance of the
      two strings by the max(len(s1), len(s2)).
  
      Examples:
  
          >>> text.diff("foo", "foo")
          0
  
          >>> text.diff("foo", "fooo")
          1
  
          >>> text.diff("foo", "")
          1
  
          >>> text.diff("1234", "1 34")
          1
  
      Arguments:
  
          s1 (str): Argument A.
          s2 (str): Argument B.
  
      Returns:
  
          float: Normalised distance between the two strings.