mkpw: rewriting in python 3

[nilamo]

Here's something basic:

import random, string, sys

rand = random.SystemRandom()
chars = string.ascii_letters + string.digits + string.punctuation
length = int(sys.argv[1])

# if the entire password needs to be unique, just set this to 0
allowed_repetition = 2
min_unique = length - allowed_repetition

pword = ""
while not len(set(pword)) >= min_unique:
   pword = "".join(rand.choice(chars) for _ in range(length))
print(pword)