Generate a password/passphrase that is just many words strung together

nwordspass.py

"""Generate n-word (default n=5) passwords separated by sep (default '-').

Uses your friendly neighborhood words file by default.
Simple Use: `python nwordspass.py`
Help: `python nwordspass.py --help`
"""

import argparse
import random

parser = argparse.ArgumentParser(
    description='Generate n-word passwords separated by sep.')
parser.add_argument('-n', type=int, default=5,
                    help='Number of words (default 5)')
parser.add_argument('-s', '--sep', type=str, default='-',
                    help='Separator for words (default "-")')
parser.add_argument(
    '--wf', type=str,
    default='/usr/share/dict/words',
    help='Path to words file (default "/usr/share/dict/words")')

args = parser.parse_args()
n, sep, wf = args.n, args.sep, args.wf

with open(wf) as f:
    lines = f.readlines()

words = set(line.strip().lower() for line in lines)
result = sep.join(random.sample(words, n))
print(result)