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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def main():
 """Entrypoint for the console script gcp-devrel-py-tools."""

    parser = argparse.ArgumentParser()
    subparsers = parser.add_subparsers()

    appengine.register_commands(subparsers)
    requirements.register_commands(subparsers)
    pylint.register_commands(subparsers)

    args = parser.parse_args()
    args.func(args)