old_contents: if __name__ == "__main__":
      __version__ = "0.13.0"
  else:
      import animatedsprite
      import collisionsprite
      import tilemap
      import layers
      import camera
  
new_contents: if __name__ == "__main__":
      __version__ = "0.13.0"
  else:
      from . import animatedsprite
      from . import collisionsprite
      from . import tilemap
      from . import layers
      from . import camera
  
subject: fix for python 3