def _add_handler_for_watch(self, event_handler, watch):
        try:
            self._handlers[watch].add(event_handler)
        except __HOLE__:
            self._handlers[watch] = set([event_handler])
dataset/ETHPy150Open yildizberkay/MongoApp/libs/watchdog/observers/api.py/BaseObserver._add_handler_for_watch