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https://issues.apache.org/jira/browse/BEAM-9012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17001281#comment-17001281
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Brian Hulette commented on BEAM-9012:
-------------------------------------
The gotcha is that pytype won't let you specify just a return type (see
https://github.com/google/pytype/issues/480). The only workaround I've found is
to include a full type annotation for the function, like {{#type: (int, str,
float) -> None}}, which can be ugly, particularly for Pipeline :/
> Include `-> None` on Pipeline and PipelineOptions `__init__` methods for
> pytype compatibility
> ---------------------------------------------------------------------------------------------
>
> Key: BEAM-9012
> URL: https://issues.apache.org/jira/browse/BEAM-9012
> Project: Beam
> Issue Type: Improvement
> Components: sdk-py-core
> Reporter: Brian Hulette
> Assignee: Brian Hulette
> Priority: Major
> Fix For: 2.19.0
>
>
> mypy [made a decision|https://github.com/python/mypy/issues/604] to allow
> init methods to omit {{\-> None}} return type annotations, but pytype has no
> such feature. I think we should include {{\-> None}} annotations for pytype
> compatibility.
> cc: [~chadrik]
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