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

["Valentyn Tymofieiev (JIRA)" <ji...@apache.org>]

Valentyn Tymofieiev created BEAM-7060:
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             Summary: 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: Bug
          Components: sdk-py-core
            Reporter: Valentyn Tymofieiev


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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