old_contents: #!/usr/bin/env python
  
  class OriginData(object):
  
      def dictionary(self):
          attributes_dictionary = {}
          for key, value in self.__dict__.items():
              if key.startswith("_"):
                  continue
              else:
                  if key not in ["observers", "selected_room"]:
                      attributes_dictionary[key] = value
  
          return attributes_dictionary
  
new_contents: #!/usr/bin/env python
  
  class OriginData(object):
  
      def dictionary(self):
          attributes_dictionary = {}
          for key, value in self.__dict__.items():
              if key.startswith("_"):
                  continue
              else:
                  attributes_dictionary[key] = value
  
          return attributes_dictionary
  
subject: remove control in dictionary()