[jira] [Resolved] (BEAM-7060) Design Py3-compatible typehints annotation support in Beam 3.

["Udi Meiri (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-7060?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Udi Meiri resolved BEAM-7060.
-----------------------------
    Resolution: Fixed

> Design Py3-compatible typehints annotation support in Beam 3.
> -------------------------------------------------------------
>
>                 Key: BEAM-7060
>                 URL: https://issues.apache.org/jira/browse/BEAM-7060
>             Project: Beam
>          Issue Type: Sub-task
>          Components: sdk-py-core
>            Reporter: Valentyn Tymofieiev
>            Assignee: Udi Meiri
>            Priority: Major
>             Fix For: 2.16.0
>
>          Time Spent: 15.5h
>  Remaining Estimate: 0h
>
> Existing [Typehints implementaiton in Beam|[https://github.com/apache/beam/blob/master/sdks/python/apache_beam/typehints/
> ] heavily relies on internal details of CPython implementation, and some of the assumptions of this implementation broke as of Python 3.6, see for example: https://issues.apache.org/jira/browse/BEAM-6877, which makes  typehints support unusable on Python 3.6 as of now. [Python 3 Kanban Board|https://issues.apache.org/jira/secure/RapidBoard.jspa?rapidView=245&view=detail] lists several specific typehints-related breakages, prefixed with "TypeHints Py3 Error".
> We need to decide whether to:
> - Deprecate in-house typehints implementation.
> - Continue to support in-house implementation, which at this point is a stale code and has other known issues.
> - Attempt to use some off-the-shelf libraries for supporting type-annotations, like  Pytype, Mypy, PyAnnotate.
> WRT to this decision we also need to plan on immediate next steps to unblock adoption of Beam for  Python 3.6+ users. One potential option may be to have Beam SDK ignore any typehint annotations on Py 3.6+.
> cc: [~udim], [~altay], [~robertwb].



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