code: def change_host_event_handler(self, host, event_handler_command):
          
          host.modified_attributes |= DICT_MODATTR["MODATTR_EVENT_HANDLER_COMMAND"].value
          data = {"commands": self.commands, "call": event_handler_command}
          host.change_event_handler(data)
          self.send_an_element(host.get_update_status_brok())
docs: Modify host event handler
          Format of the line that triggers function call::
  
          CHANGE_HOST_EVENT_HANDLER;<host_name>;<event_handler_command>
  
          :param host: host to modify event handler
          :type host: alignak.objects.host.Host
          :param event_handler_command: event handler command line
          :type event_handler_command:
          :return: None