content: #
  # Licensed to the Apache Software Foundation (ASF) under one or more
  # contributor license agreements.  See the NOTICE file distributed with
  # this work for additional information regarding copyright ownership.
  # 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
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  from __future__ import absolute_import
  
  import unittest
  
  import pandas as pd
  
  import apache_beam as beam
  from apache_beam.dataframe import convert
  from apache_beam.testing.util import assert_that
  
  
  class ConverTest(unittest.TestCase):
    def test_convert(self):
      def equal_to_unordered_series(expected):
        def check(actual):
          actual = pd.concat(actual)
          if sorted(expected) != sorted(actual):
            raise AssertionError(
                'Series not equal: \n%s\n%s\n' % (expected, actual))
  
        return check
  
      with beam.Pipeline() as p:
        a = pd.Series([1, 2, 3])
        b = pd.Series([100, 200, 300])
  
        pc_a = p | 'A' >> beam.Create([a])
        pc_b = p | 'B' >> beam.Create([b])
  
        df_a = convert.to_dataframe(pc_a, proxy=a[:0])
        df_b = convert.to_dataframe(pc_b, proxy=b[:0])
  
        df_2a = 2 * df_a
        df_3a = 3 * df_a
        df_ab = df_a * df_b
  
        # Converting multiple results at a time can be more efficient.
        pc_2a, pc_ab = convert.to_pcollection(df_2a, df_ab)
        # But separate conversions can be done as well.
        pc_3a = convert.to_pcollection(df_3a)
  
        assert_that(pc_2a, equal_to_unordered_series(2 * a), label='Check2a')
        assert_that(pc_3a, equal_to_unordered_series(3 * a), label='Check3a')
        assert_that(pc_ab, equal_to_unordered_series(a * b), label='Checkab')
  
  
  if __name__ == '__main__':
    unittest.main()
  