Quickly generate random numeric PINs

makepin.py

#!/usr/bin/env python3

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

import secrets
import sys

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

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