old_contents: #!/usr/bin/env python
  #coding:utf-8
  
  import pyglet
  import time
  
  song = pyglet.media.load('music/mpthreetest.mp3')
  song.play()
  
  pyglet.app.run()
  
  
  
  
new_contents: #!/usr/bin/env python
  #coding:utf-8
  
  import pyglet
  
  song = pyglet.media.load('music/mpthreetest.mp3')
  song.play()
  
  pyglet.app.run()
  
  
  
  
subject: remove unused import