Method put_if_empty

huey/storage.py:222–233

Atomically write data only if the key is not already set. :param bytes key: Key to check/set. :param bytes value: Arbitrary data. :return: Boolean whether key/value was set.

(self, key, value)

        raise NotImplementedError

    def put_if_empty(self, key, value):
        """
        Atomically write data only if the key is not already set.

        :param bytes key: Key to check/set.
        :param bytes value: Arbitrary data.
        :return: Boolean whether key/value was set.
        """
        if self.has_data_for_key(key):
            return False
        self.put_data(key, value)
        return True

    def incr(self, key, amount=1):
        """