code: def to_shorthand(self):
          
          if self.octave < 3:
              res = self.name
          else:
              res = str.lower(self.name)
          o = self.octave - 3
          while o < -1:
              res += ','
              o += 1
          while o > 0:
              res += "'"
              o -= 1
          return res
docs: Give the traditional Helmhotz pitch notation.
  
          Examples:
          >>> Note('C-4').to_shorthand()
          "c'"
          >>> Note('C-3').to_shorthand()
          'c'
          >>> Note('C-2').to_shorthand()
          'C'
          >>> Note('C-1').to_shorthand()
          'C,'