code: def dist_hamming(src, tar, diff_lens=True):
      
      return Hamming().dist(src, tar, diff_lens)
docs: Return the normalized Hamming distance between two strings.
  
      This is a wrapper for :py:meth:`Hamming.dist`.
  
      Parameters
      ----------
      src : str
          Source string for comparison
      tar : str
          Target string for comparison
      diff_lens : bool
          If True (default), this returns the Hamming distance for those
          characters that have a matching character in both strings plus the
          difference in the strings' lengths. This is equivalent to extending the
          shorter string with obligatorily non-matching characters. If False, an
          exception is raised in the case of strings of unequal lengths.
  
      Returns
      -------
      float
          The normalized Hamming distance
  
      Examples
      --------
      >>> round(dist_hamming('cat', 'hat'), 12)
      0.333333333333
      >>> dist_hamming('Niall', 'Neil')
      0.6
      >>> dist_hamming('aluminum', 'Catalan')
      1.0
      >>> dist_hamming('ATCG', 'TAGC')
      1.0