code: def dist_abs(self, src, tar, qval=2, alphabet=None):
          r
          return super(self.__class__, self).dist_abs(
              src, tar, qval, float('inf'), False, alphabet
          )
docs: r"""Return the Chebyshev distance between two strings.
  
          Parameters
          ----------
          src : str
              Source string (or QGrams/Counter objects) for comparison
          tar : str
              Target string (or QGrams/Counter objects) for comparison
          qval : int
              The length of each q-gram; 0 for non-q-gram version alphabet
          alphabet : collection or int
              The values or size of the alphabet
  
          Returns
          -------
          float
              The Chebyshev distance
  
          Examples
          --------
          >>> cmp = Chebyshev()
          >>> cmp.dist_abs('cat', 'hat')
          1.0
          >>> cmp.dist_abs('Niall', 'Neil')
          1.0
          >>> cmp.dist_abs('Colin', 'Cuilen')
          1.0
          >>> cmp.dist_abs('ATCG', 'TAGC')
          1.0
          >>> cmp.dist_abs('ATCG', 'TAGC', qval=1)
          0.0
          >>> cmp.dist_abs('ATCGATTCGGAATTTC', 'TAGCATAATCGCCG', qval=1)
          3.0