Robert Bradshaw created BEAM-7840:
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Summary: 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
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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