script to generate password tokens of arbitrary length

pass-gen.py

#!/usr/bin/env python3

import secrets
import string
import argparse

def gen_pass(length, symbols=None, no_numbers=False, no_upper=False):
    alphabet = string.ascii_letters
    if no_upper:
        alphabet = string.ascii_lowercase
    if not no_numbers:
        alphabet += string.digits
    if symbols:
        alphabet += symbols
    while True:
        secret = ''.join(secrets.choice(alphabet) for i in range(length))
        cond = (any(c.islower() for c in secret))
        if not no_upper:
            cond = (cond and any(c.isupper() for c in secret))
        if not no_numbers:
            cond = (cond and (sum(c.isdigit() for c in secret) >= 1))
        if symbols:
            cond = (cond and (sum(c in symbols for c in secret) >= 1))
        if cond:
            break
    return secret

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description='Generate secrets')
    parser.add_argument("-n", "--length", type=int, default=12)
    parser.add_argument("-s", "--symbols", nargs="?", const='/-_+!$#^*.,~', type=str, default=None)
    parser.add_argument("--no-numbers", action='store_true', default=False)
    parser.add_argument("--no-upper", action='store_true', default=False)

    args = parser.parse_args()
    print(gen_pass(length=args.length, symbols=args.symbols, no_numbers=args.no_numbers, no_upper=args.no_upper))