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https://issues.apache.org/jira/browse/FLINK-39741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18083017#comment-18083017
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Vaibhav S Gowda commented on FLINK-39741:
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PR submitted: https://github.com/apache/flink/pull/28216
> Add generic type hints to DataStream functions in functions.py
> --------------------------------------------------------------
>
> Key: FLINK-39741
> URL: https://issues.apache.org/jira/browse/FLINK-39741
> Project: Flink
> Issue Type: Improvement
> Components: API / Python
> Reporter: Vaibhav S Gowda
> Priority: Minor
>
> This improvement adds generic type hints to the core abstract
> function classes in pyflink/datastream/functions.py.
> Changes include:
> - Made MapFunction properly Generic[IN, OUT]
> - Made FlatMapFunction properly Generic[IN, OUT]
> - Made FilterFunction properly Generic[IN]
> - Made KeySelector properly Generic[IN, KEY]
> - Added return type annotations to all abstract methods
> - Fixed docstring typos
> This enables mypy static type checking for users extending
> these classes and improves IDE autocompletion quality.
> PR: https://github.com/apache/flink/pull/28216
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