rediscache.py 文件源码

def incr(self, key, delta=1, version=None):
        """
        Add delta to value in the cache. If the key does not exist, raise a
        ValueError exception.
        """
        key = self.make_key(key, version=version)
        exists = self._client.exists(key)
        if not exists:
            raise ValueError("Key '%s' not found" % key)
        try:
            value = self._client.incr(key, delta)
        except redis.ResponseError:
            value = self.get(key) + delta
            self.set(key, value)
        return value