ASF GitHub Bot logged work on BEAM-8156:

                Author: ASF GitHub Bot
            Created on: 12/Sep/19 00:02
            Start Date: 12/Sep/19 00:02
    Worklog Time Spent: 10m 
      Work Description: udim commented on pull request #9509: [BEAM-8156] Add 
URL: https://github.com/apache/beam/pull/9509
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Issue Time Tracking

            Worklog Id:     (was: 311091)
    Remaining Estimate: 502h 20m  (was: 502.5h)
            Time Spent: 1h 40m  (was: 1.5h)

> Finish migration to standard Python typing
> ------------------------------------------
>                 Key: BEAM-8156
>                 URL: https://issues.apache.org/jira/browse/BEAM-8156
>             Project: Beam
>          Issue Type: Improvement
>          Components: sdk-py-core
>            Reporter: Robert Bradshaw
>            Assignee: Udi Meiri
>            Priority: Major
>   Original Estimate: 504h
>          Time Spent: 1h 40m
>  Remaining Estimate: 502h 20m
> We should migrate all Python uses of types to the standard typing module, and 
> make the typehints.* ones aliases of the Python ones. 
> There are three places where we use custom typehints behavior: 
> (1) is_compatible_with
> (2) bind_type_variables/match_type_variables
> (3) trivial type inference. 
> I would propose that each of these be adapted to a (internal) public 
> interface that accepts and returns standard typing types, and internally 
> converts to our (nowhere else exposed) typehints types, performs the logic, 
> and converts back. Each of these in turn can then be updated, as needed and 
> orthogonally, to operate on the typing types natively (possibly via deference 
> to a third-party library). 
> I think coder inference could be easily adopted to use typing types directly, 
> but it may be a fourth place where we do internal conversion first. Another 
> gotcha is special care may need to be taken if we ever need to pickle these 
> types (which IIRC may have issues). 

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