[BEAM-7840] Create MapTuple and FlatMapTuple to ease migration to Python 3.

• Type: Test
• Status: Resolved
• Priority: P2
• Resolution: Fixed
• Fix Version/s: 2.15.0
• Component/s: sdk-py-core
• Assignee: Robert Bradshaw
• Reporter: Robert Bradshaw
• Created: 29/Jul/19 13:36
• Updated: 29/Jul/20 08:00
• Resolved: 31/Jul/19 08:12

Description

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))

Issue Links

• links to: GitHub Pull Request #9168