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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():
 """ This is the main function for the UCSC Precision Immuno pipeline. """

    parser = argparse.ArgumentParser()
    parser.add_argument('--config_file', dest='config_file', help='Config file to be used in the' +
                        'run.', type=str, required=True, default=None)
    Job.Runner.addToilOptions(parser)
    params = parser.parse_args()
    START = Job.wrapJobFn(parse_config_file, params.config_file).encapsulate()
    Job.Runner.startToil(START, params)
    return None