[ 
https://issues.apache.org/jira/browse/BEAM-7060?focusedWorklogId=288205&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-288205
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ASF GitHub Bot logged work on BEAM-7060:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 02/Aug/19 19:57
            Start Date: 02/Aug/19 19:57
    Worklog Time Spent: 10m 
      Work Description: udim commented on issue #9223: [BEAM-7060] Introduce 
Python3-only test modules
URL: https://github.com/apache/beam/pull/9223#issuecomment-517826104
 
 
   run python precommit
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 288205)
    Time Spent: 7.5h  (was: 7h 20m)

> 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
>          Time Spent: 7.5h
>  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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