old_contents: # -*- coding: utf-8 -*-
  
  
  class IOwner:
  
      def get_user_info(self, scopes):
          raise NotImplementedError
  
new_contents: # -*- coding: utf-8 -*-
  
  
  class IOwner:
  
      def get_user_info(self, scopes):
          raise NotImplementedError
  
      def get_sub(self):
          raise NotImplementedError
  
subject: update interfaces