liferoad commented on code in PR #25743:
URL: https://github.com/apache/beam/pull/25743#discussion_r1132912439


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CHANGES.md:
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@@ -68,6 +68,7 @@
 
 ## Breaking Changes
 
+* Python SDK now does not allow mixing the yield and return statements in 
`DoFn.process()` ([#22969](https://github.com/apache/beam/issues/22969)). 
`yield` is recommended for emitting elements and `yield from` for iterators.

Review Comment:
   I added this to the warning message. The current doc indeed has this 
information here: https://beam.apache.org/documentation/programming-guide/#pardo



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