def _store(self, messages, response, *args, **kwargs):
        for storage in self.storages:
            if messages:
                messages = storage._store(messages, response,
                                          remove_oldest=False)
            # Even if there are no more messages, continue iterating to ensure
            # storages which contained messages are flushed.
            elif storage in self._used_storages:
                storage._store([], response)
                self._used_storages.remove(storage)
        return messages
Stores the messages, returning any unstored messages after trying all
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/django/contrib/messages/storage/fallback.py/FallbackStorage._store