sdks/python/apache_beam/examples/snippets/transforms/elementwise/tostring.py

# coding=utf-8
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# The ASF licenses this file to You under the Apache License, Version 2.0
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#    http://www.apache.org/licenses/LICENSE-2.0
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from __future__ import absolute_import
from __future__ import print_function


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

  with beam.Pipeline() as pipeline:
    plants = (
        pipeline
        | 'Garden plants' >> beam.Create([
            ('🍓', 'Strawberry'),
            ('🥕', 'Carrot'),
            ('🍆', 'Eggplant'),
            ('🍅', 'Tomato'),
            ('🥔', 'Potato'),
        ])
        | 'To string' >> beam.ToString.Kvs()
        | beam.Map(print)
    )
    # [END tostring_kvs]
    if test:
      test(plants)


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

  with beam.Pipeline() as pipeline:
    plant_lists = (
        pipeline
        | 'Garden plants' >> beam.Create([
            ['🍓', 'Strawberry', 'perennial'],
            ['🥕', 'Carrot', 'biennial'],
            ['🍆', 'Eggplant', 'perennial'],
            ['🍅', 'Tomato', 'annual'],
            ['🥔', 'Potato', 'perennial'],
        ])
        | 'To string' >> beam.ToString.Element()
        | beam.Map(print)
    )
    # [END tostring_element]
    if test:
      test(plant_lists)


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

  with beam.Pipeline() as pipeline:
    plants_csv = (
        pipeline
        | 'Garden plants' >> beam.Create([
            ['🍓', 'Strawberry', 'perennial'],
            ['🥕', 'Carrot', 'biennial'],
            ['🍆', 'Eggplant', 'perennial'],
            ['🍅', 'Tomato', 'annual'],
            ['🥔', 'Potato', 'perennial'],
        ])
        | 'To string' >> beam.ToString.Iterables()
        | beam.Map(print)
    )
    # [END tostring_iterables]
    if test:
      test(plants_csv)