import argparse

import sys

def parse_argv():

parser = argparse.ArgumentParser(description='test for argparse')

parser.add_argument(dest='filenames', metavar='filenames', nargs='*')

parser.add_argument('-p', '--pat', metavar='pattern', required=True,

dest='patterns', action='append',

help='text pattern to search for')

parser.add_argument('-v', dest='verbose', action='store_true',

help='verbose mode')

parser.add_argument('-o', dest='outfile', action='store',

help='output file')

parser.add_argument('--speed', dest='speed', action='store',

choices=('slow', 'fast'), default='slow',

help='search speed')

args = parser.parse_args()

print(args.filenames)

print(args.patterns)

print(args.verbose)

print(args.outfile)

print(args.speed)

if __name__ == '__main__':

print(sys.argv)

parse_argv()