new_contents: # encoding: utf-8
  
  class IntIds:
  
      _id_obj = {}
      _obj_id = {}
      
      def __init__(self):
          self._id_obj = {}
          self._obj_id = {}
          
      def get_id(self, obj):
          return self._obj_id[obj]
          
      def get_object(self, id):
          return self._id_obj[id]
  
subject: Create intids.py