old_contents: #!/usr/bin/env python
  # -*- coding: UTF-8 -*-
  
  
  from cefbrowser import *  # noqa: F401,F403
  
new_contents: #!/usr/bin/env python
  # -*- coding: UTF-8 -*-
  
  
  from .cefbrowser import *  # noqa: F401,F403
  
subject: Fix relative import bug