code: def real_quick_ratio(self):
          
  
          la, lb = len(self.a), len(self.b)
          # can't have more matches than the number of elements in the
          # shorter sequence
          return _calculate_ratio(min(la, lb), la + lb)
docs: Return an upper bound on ratio() very quickly.
  
          This isn't defined beyond that it is an upper bound on .ratio(), and
          is faster to compute than either .ratio() or .quick_ratio().