code: def measure(note1, note2):
      
      res = notes.note_to_int(note2) - notes.note_to_int(note1)
      if res < 0:
          return 12 - res * -1
      else:
          return res
docs: Return an integer in the range of 0-11, determining the half note steps
      between note1 and note2.
  
      Examples:
      >>> measure('C', 'D')
      2
      >>> measure('D', 'C')
      10