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https://issues.apache.org/jira/browse/BEAM-7840?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Bradshaw resolved BEAM-7840.
-----------------------------------
Resolution: Fixed
> Create MapTuple and FlatMapTuple to ease migration to Python 3.
> ---------------------------------------------------------------
>
> Key: BEAM-7840
> URL: https://issues.apache.org/jira/browse/BEAM-7840
> Project: Beam
> Issue Type: Test
> Components: sdk-py-core
> Reporter: Robert Bradshaw
> Assignee: Robert Bradshaw
> Priority: Major
> Fix For: 2.15.0
>
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> These are like Map and FlatMap but expand out tuple input elements across
> several arguments. This will be useful as tuple argument unpacking has been
> removed in Python 3. Instead of having to convert
> Map(lambda (k, v): expresion(k, v))
> into
> Map(lambda k_v: expression(k_v[0], k_v[1]))
> one can now write
> MapTuple(lambda k, v: expression(k, v))
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