import random, pprint
from itertools import product, combinations

N_DRAW = 9
N_GOAL = N_DRAW // 2

deck = list(product("red green purple".split(),
                    "one two three".split(),
                    "oval squiggle diamond".split(),
                    "solid open striped".split()))

sets = []
while len(sets) != N_GOAL:
    draw = random.sample(deck, N_DRAW)
    sets = [cs for cs in combinations(draw, 3)
            if all(len(set(t)) in [1, 3] for t in zip(*cs))]

print "Dealt %d cards:" % len(draw)
pprint.pprint(draw)
print "\nContaining %d sets:" % len(sets)
pprint.pprint(sets)