sdks/python/apache_beam/yaml/options.py

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from apache_beam.options import pipeline_options


class YamlOptions(pipeline_options.PipelineOptions):
  @classmethod
  def _add_argparse_args(cls, parser):
    parser.add_argument(
        '--yaml_experimental_features',
        dest='yaml_experimental_features',
        action='append',
        default=[],
        help=('Enable yaml features ahead of them being declared stable.'))

  @classmethod
  def check_enabled(cls, pipeline, feature, description=None):
    if feature not in pipeline._options.view_as(cls).yaml_experimental_features:
      raise ValueError(
          f'{description or feature} unsupported because '
          f'{feature} is not set in --yaml_experimental_features option.')