# coding=utf-8
#
# Licensed to the Apache Software Foundation (ASF) under one or more
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# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
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# pytype: skip-file
# pylint:disable=line-too-long

# beam-playground:
#   name: KvSwap
#   description: Demonstration of KvSwap transform usage.
#   multifile: false
#   default_example: false
#   context_line: 40
#   categories:
#     - Core Transforms
#   complexity: BASIC
#   tags:
#     - transforms
#     - pairs


def kvswap(test=None):
  # [START kvswap]
  import apache_beam as beam

  with beam.Pipeline() as pipeline:
    plants = (
        pipeline
        | 'Garden plants' >> beam.Create([
            ('🍓', 'Strawberry'),
            ('🥕', 'Carrot'),
            ('🍆', 'Eggplant'),
            ('🍅', 'Tomato'),
            ('🥔', 'Potato'),
        ])
        | 'Key-Value swap' >> beam.KvSwap()
        | beam.Map(print))
    # [END kvswap]
    if test:
      test(plants)


if __name__ == '__main__':
  kvswap()
