import argparse


def _GetOptionsParser():
    """Get the options parser."""
    parser = argparse.ArgumentParser(description='Process some integers.')

    parser.add_argument(
        '--greeting',
        dest='greeting',
        action='store',
        help=('If specified, use this input instead of asking.')
    )
    return parser

args = _GetOptionsParser().parse_args()

greeting = args.greeting

print greeting

if not greeting:
    greeting = raw_input("Give me the greeting. ")

print "The greeting is: ", greeting