A simple random password generator CLI application. Mostly created for the purpose of testing the click package (http://click.pocoo.org/)

pwgen.py

import click
import string
import random
 
 
def _randomize(alphabet, count):
    """Return a random string consisting of characters from the alphabet.
    The length of the returned string should be ``count``.
    """
    rng = random.SystemRandom()
    return ''.join(rng.choice(alphabet) for _ in range(count))
 
 
def _shuffle(password_chars):
    """Shuffle the characters of the given string."""
    password_chars = list(password_chars)
    rng = random.SystemRandom()
    rng.shuffle(password_chars)
    return ''.join(password_chars)
 
 
@click.command()
@click.option('--letters', default=8,
              help='Number of letters in the generated password')
@click.option('--digits', default=4,
              help='Number of digits in the generated password')
@click.option('--punctuation', default=4,
              help='Number of punctuation chars in the generated password')
def generate_password(letters, digits, punctuation):
    """Generates a random password containing the given number of each char
    type.
    """
    password_chars = ''.join([
            _randomize(string.letters[0:52], letters),
            _randomize(string.digits, digits),
            _randomize(string.punctuation, punctuation),
    ])
 
    print _shuffle(password_chars)
 
 
if __name__ == '__main__':
    generate_password()