herywang opened a new issue, #889:
URL: https://github.com/apache/rocketmq-clients/issues/889
### Programming Language of the Client
Python
### Is Your Feature Request Related to a Problem?
There are some problems with using a traditional method to start a
background thread consumer in our program, such as this code snippet:
```python
import threading
def start_consumer():
# Refer to simple_consumer_example.py to create a simple consumer
# Starting a background consumer:
t = threading.Thread(target=start_consumer)
t.start()
```
Using the above writing method, you will get the following error message in
your `~/logs/rocketmq_python/rocketmq_client.log`
such as: `update topic route error, topic: xxxxxx, 'NoneType' object has no
attribute 'encode'`
such as: `subscribe exception: 'NoneType' object has no attribute 'encode'`
such as: `There is no topic to receive the message`
### Describe the Solution You'd Like
I will submit an example to start a simple rocketmq consumer in a background
thread.
### Describe Alternatives You've Considered
Using `asyncio` to start a backgroun consumer to resolve above error.
### Additional Context
_No response_
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