code: def serialize(self):
          
          res = super(Notification, self).serialize()
  
          if res['command_call'] is not None:
              if not isinstance(res['command_call'], string_types) and \
                      not isinstance(res['command_call'], dict):
                  res['command_call'] = res['command_call'].serialize()
          return res
docs: This function serialize into a simple dict object.
          It is used when transferring data to other daemons over the network (http)
  
          Here we directly return all attributes
  
          :return: json representation of a Timeperiod
          :rtype: dict