How to use the memorious.core.conn.set function in memorious

def set_tag(self, key, value):
        data = dump_json(value)
        key = make_key(self.crawler, "tag", key)
        return conn.set(key, data, ex=self.crawler.expire)

def save(self):
        session = pickle.dumps(self.session)
        session = codecs.encode(session, 'base64')
        key = sha1(session).hexdigest()[:15]
        key = make_key(self.context.run_id, "session", key)
        conn.set(key, session, ex=QUEUE_EXPIRE)
        self.context.state[self.STATE_SESSION] = key

def operation_start(cls, crawler, stage, run_id):
        if not conn.sismember(make_key(crawler, "runs"), run_id):
            conn.sadd(make_key(crawler, "runs"), run_id)
            conn.set(make_key("run", run_id, "start"), pack_now())
        conn.incr(make_key("run", run_id))
        conn.incr(make_key("run", run_id, "total_ops"))
        conn.incr(make_key(crawler, stage))
        conn.incr(make_key(crawler, "total_ops"))
        conn.set(make_key(crawler, "last_run"), pack_now())
        conn.set(make_key(crawler, "current_run"), run_id)

def operation_start(cls, crawler, stage, run_id):
        if not conn.sismember(make_key(crawler, "runs"), run_id):
            conn.sadd(make_key(crawler, "runs"), run_id)
            conn.set(make_key("run", run_id, "start"), pack_now())
        conn.incr(make_key("run", run_id))
        conn.incr(make_key("run", run_id, "total_ops"))
        conn.incr(make_key(crawler, stage))
        conn.incr(make_key(crawler, "total_ops"))
        conn.set(make_key(crawler, "last_run"), pack_now())
        conn.set(make_key(crawler, "current_run"), run_id)

def operation_end(cls, crawler, run_id):
        conn.set(make_key(crawler, "last_run"), pack_now())
        pending = conn.decr(make_key("run", run_id))
        if unpack_int(pending) == 0:
            conn.set(make_key("run", run_id, "end"), pack_now())