my_app/app.py

# Copyright 2022 Google LLC
#
# Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
# https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
# <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
# option. This file may not be copied, modified, or distributed
# except according to those terms.

from typing import Callable, Optional
import apache_beam as beam
from apache_beam.options.pipeline_options import PipelineOptions


def run(
    input_text: str,
    beam_options: Optional[PipelineOptions] = None,
    test: Callable[[beam.PCollection], None] = lambda _: None,
) -> None:
    with beam.Pipeline(options=beam_options) as pipeline:
        elements = (
            pipeline
            | "Create elements" >> beam.Create(["Hello", "World!", input_text])
            | "Print elements" >> beam.Map(print)
        )

        # Used for testing only.
        test(elements)