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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 parse_config(args=sys.argv):
 """Parse the args using the config_file pattern Args: args: sys.argv Returns: The populated namespace object from parser.parse_args(). Raises: TBD """

    parser = argparse.ArgumentParser(
        description='Read in the config file')
    parser.add_argument(
        'config_file',
        help='Configuration file.',
        metavar='FILE', type=extant_file)
    return parser.parse_args(args[1:])