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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():
 """Create a new Cheroot instance with arguments from the command line."""

    parser = argparse.ArgumentParser(
        description='Start an instance of the Cheroot WSGI/HTTP server.',
    )
    for arg, spec in _arg_spec.items():
        parser.add_argument(arg, **spec)
    raw_args = parser.parse_args()

    # ensure cwd in sys.path
    '' in sys.path or sys.path.insert(0, '')

    # create a server based on the arguments provided
    raw_args._wsgi_app.server(raw_args).safe_start()