pykafka Producer.produce accepts a bytes object as message

参考官方文档生产消息时候
pykafka官方文档

with topic.get_sync_producer() as producer:
    for i in range(4):
        producer.produce("test message"+str(i**2))

报错：

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-31-483c5e25578b> in <module>
      1 with topic.get_sync_producer() as producer:
      2     for i in range(4):
----> 3         producer.produce("test message"+str(i**2))

/opt/python3.6.7/lib/python3.6/site-packages/pykafka/producer.py in produce(self, message, partition_key, timestamp)
    374             if message is not None and type(message) is not bytes:
    375                 raise TypeError("Producer.produce accepts a bytes object as message, but it "
--> 376                                 "got '%s'", type(message))
    377         if timestamp is not None and self._protocol_version < 1:
    378             raise RuntimeError("Producer.produce got a timestamp with protocol 0")

TypeError: ("Producer.produce accepts a bytes object as message, but it got '%s'", <class 'str'>)

• 原因
  producer只能生产bytes消息
• 修改

with topic.get_sync_producer() as producer:
    for i in range(4):
        producer.produce(bytes("test message"+str(i**2),encoding='utf-8'))