makepasswd

#!/usr/bin/env python3
import argparse
import random
import string

BASE_CHOICES = frozenset(set(string.ascii_letters + string.digits + string.punctuation) - set('''lIoO1"'&$.,:='''))


def main(length, choices):
    return ''.join(random.choice(choices) for _ in range(length))


if __name__ == '__main__':
    # Parse the cmdline.
    parser = argparse.ArgumentParser(description='Password generator.')
    parser.add_argument('-D', '--exclude-digits', dest='digits', action='store_false', help='Exclude digit characters.')
    parser.add_argument('-P', '--exclude-punct', dest='punctuation', action='store_false', help='Exclude punctuation characters.')
    parser.add_argument('-E', '--exclude', type=str, help='Explicitly specify the charcters to exclude.')
    parser.add_argument('-l', '--length', type=int, default=64, help='The length of the password to generate.')
    parser.set_defaults(digits=True, punctuation=True)
    args = parser.parse_args()

    # Construct the set of characters to chose from.
    choices = set(BASE_CHOICES)
    if not args.digits:
        choices -= set(string.digits)
    if not args.punctuation:
        choices -= set(string.punctuation)
    if args.exclude:
        choices -= set(args.exclude)

    password = main(args.length, tuple(choices))
    print(password)