old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  """Top-level module for RasterFairy"""
  
  from rasterfairy import *
  from coonswarp import *
  from rfoptimizer import *
  from images2gif import *
  
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  """Top-level module for RasterFairy"""
  
  from .rasterfairy import *
  from .coonswarp import *
  from .rfoptimizer import *
  # from images2gif import *
  
  
subject: Optimize internal imports from python2 to python3.