old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  from abstract import Abstract
  
  
  __all__ = ['Abstract']
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  from abstract import Abstract
  from json import Json
  
  __all__ = ['Abstract', 'Json']
  
subject: Load pygrapes.serializer.json.Json right inside pygrapes.serializer