old_contents: # -*- coding: utf-8 -*-
  
  __author__ = 'Chia-Jung, Yang'
  __email__ = 'jeroyang@gmail.com'
  __version__ = '0.1.0'
  
new_contents: # -*- coding: utf-8 -*-
  from __future__ import (absolute_import, division,
                          print_function, unicode_literals)
  from builtins import *
  
  from .retools import *
  
  __author__ = 'Chia-Jung, Yang'
  __email__ = 'jeroyang@gmail.com'
  __version__ = '0.1.0'
  
  
  
subject: change import statement