liferoad opened a new issue, #28061: URL: https://github.com/apache/beam/issues/28061
### What would you like to happen? When creating a `DoFn`, if the `process` method returns None, we can issue a warning, such as `no iterator is returned by the process method in DoFn`. This could help users debug whether returning None is expected. Possible code changes could be in `_check_fn_use_yield_and_return` from https://github.com/apache/beam/blob/master/sdks/python/apache_beam/transforms/core.py. ### Issue Priority Priority: 3 (nice-to-have improvement) ### Issue Components - [X] Component: Python SDK - [ ] Component: Java SDK - [ ] Component: Go SDK - [ ] Component: Typescript SDK - [ ] Component: IO connector - [ ] Component: Beam examples - [ ] Component: Beam playground - [ ] Component: Beam katas - [ ] Component: Website - [ ] Component: Spark Runner - [ ] Component: Flink Runner - [ ] Component: Samza Runner - [ ] Component: Twister2 Runner - [ ] Component: Hazelcast Jet Runner - [ ] Component: Google Cloud Dataflow Runner -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
