Quickly generate random numeric PINs

makepin.py

#!/usr/bin/env python3

# Usage: ./makepin.py [number of digits, default 4]

import secrets
import sys

if len(sys.argv) < 2:
    digit_count = 4
else:
    digit_count = int(sys.argv[1])

pin = secrets.randbelow(10**digit_count)
pin_format = "{{:0{}}}".format(digit_count)
print(pin_format.format(pin))