如何在python

Question

我正在尝试为python kafka创建一个简单的函数，我在将一个字符串循环传递给producer.send_messages方法时遇到了麻烦。

from kafka import SimpleProducer, KafkaClient
import random
import os

kafka = KafkaClient('localhost:9092')
producer = SimpleProducer(kafka)
x = 0

while x!=1:
        #producer.send_messages(b'test1',b'str(i)') #the program will run with this type of input
        a=random.random()
        message_method= "b"+"'"+topic+"'"+","+"b"+"'"+str(a)+"'"
        producer.send_messages(message_method)

我最终会遇到这个错误，

 File "<stdin>", line 4, in <module>
  File "/usr/lib/python2.7/site-packages/kafka/producer/simple.py", line 52, in send_messages
    partition = self._next_partition(topic)
  File "/usr/lib/python2.7/site-packages/kafka/producer/simple.py", line 36, in _next_partition
    self.client.load_metadata_for_topics(topic)
  File "/usr/lib/python2.7/site-packages/kafka/client.py", line 378, in load_metadata_for_topics
    kafka.common.check_error(topic_metadata)
  File "/usr/lib/python2.7/site-packages/kafka/common.py", line 233, in check_error
    raise error_class(response)
kafka.common.UnknownError: TopicMetadata(topic="b'test1',b'0.595202345912'", error=17, partitions=[])

我感谢任何建议，使其变得更加动态（不需要硬代码b'messages'等）将消息放入kafka。 ：d

Answer 1

您应该以这种方式使用send_message函数：

producer.send_messages('test1', str(a))

我认为这更合适。