pin_shuffler.py

# pin_shuffler.py - quick 4 digit pin generator written out of boredom.
# slightly revised
from itertools import permutations
from random import seed, shuffle
from time import time
from operator import concat
from functools import reduce

all_pins = [x for x in permutations(range(10), 4)]
seed(time())
shuffle(all_pins)
pin_choice = all_pins[0]
new_pin = reduce(concat, [str(x) for x in pin_choice])
print("your new pin is: %s" % new_pin)

Tweaked to make it a little more efficient.