pwgen

#!/usr/bin/python3

import random
from argparse import ArgumentParser

defaults = {
    'base characters': r'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!@#$%^&*()',
    'length': 25,
    'excluded': '',
    'specials': '',
}

parser = ArgumentParser(description=f'Generate a random password.\n Base characters: {defaults["base characters"]}')
parser.add_argument('-s', '--specials', type=str, nargs='?', default=defaults['specials'], const='',
                    help=f'include special characters. \nDefault: {defaults["specials"]}')
parser.add_argument('-e', '--excluded', type=str, nargs='?', default=defaults['excluded'], const='',
                    help=f'exclude any of the base characters. \nExcluded by default: ')
parser.add_argument('-l', '--length', type=int, default=defaults['length'],
                    help=f'set password length ({defaults["length"]})')


def generate(arguments):
    symbol_set = [character for character in defaults['base characters'] if character not in arguments['excluded']]
    symbol_set.extend(arguments['specials'])
    password = ''.join([random.choice(symbol_set) for _ in range(arguments['length'])])
    return password


if __name__ == '__main__':
    args = vars(parser.parse_args())
    print(generate(args))