tuteng opened a new issue #5618: [Docs]The document of python function description is incorrect URL: https://github.com/apache/pulsar/issues/5618 **Describe the bug** There was an error in the example of using [python function](http://pulsar.apache.org/docs/en/functions-develop/#example) that causes the following exception to be thrown: ``` 2019-11-11 09:48:43 +0000] [ERROR] log.py: Traceback (most recent call last): [2019-11-11 09:48:43 +0000] [ERROR] log.py: File "/pulsar/instances/python-instance/python_instance_main.py", line 211, in <module> [2019-11-11 09:48:43 +0000] [ERROR] log.py: main() [2019-11-11 09:48:43 +0000] [ERROR] log.py: File "/pulsar/instances/python-[instance/python_instance_main.py", line 192, in main [2019-11-11 09:48:43 +0000] [ERROR] log.py: pyinstance.run() [2019-11-11 09:48:43 +0000] [ERROR] log.py: File "/pulsar/instances/python-instance/python_instance.py", line 186, in run [2019-11-11 09:48:43 +0000] [ERROR] log.py: self.input_serdes[topic] = serde_kclass() [2019-11-11 09:48:43 +0000] [ERROR] log.py: TypeError [2019-11-11 09:48:43 +0000] [ERROR] log.py: : [2019-11-11 09:48:43 +0000] [ERROR] log.py: __init__() takes exactly 2 arguments (1 given) ``` Parameters should not appear in the initialization function of class TweetSerDe, messages should come from the topic and should not be assigned during initialization. the document example is wrong, and the correct example should be: ``` class Tweet(object): def __init__(self, username, tweet_content): self.username = username self.tweet_content = tweet_content from pulsar import SerDe class TweetSerDe(SerDe): def __init__(self): pass def serialize(self, input): return bytes("{0}|{1}".format(input.username, input.tweet_content)) def deserialize(self, input_bytes): tweet_components = str(input_bytes).split('|') return Tweet(tweet_components[0], tweet_componentsp[1]) ``` Reference: https://github.com/apache/pulsar/blob/master/pulsar-functions/python-examples/custom_object_function.py **Expected behavior** Fix document **Additional context** Use the correct example on the document
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