Python cards

SUITS=('S','D','C','H')
RANKS=('A',2,3,4,5,6,7,8,9,10,'J','Q','K')

# define card class
class Card:
    def __init__(self, suit, rank):
        if (suit in SUITS) and (rank in RANKS):
            self.suit = suit
            self.rank = rank
        else:
            self.suit = None
            self.rank = None
            print "Invalid card: ", suit, rank

    def __str__(self):
        return "%s%s" % (self.suit, self.rank)

    def get_suit(self):
        return self.suit

    def get_rank(self):
        return self.rank

    # def draw(self, canvas, pos):
    #    card_loc = (CARD_CENTER[0] + CARD_SIZE[0] * RANKS.index(self.rank),
    #                CARD_CENTER[1] + CARD_SIZE[1] * SUITS.index(self.suit))
    #    canvas.draw_image(card_images, card_loc, CARD_SIZE, [pos[0] + CARD_CENTER[0], pos[1] + CARD_CENTER[1]], CARD_SIZE)

# define hand class
class Hand:
    def __init__(self):
        self.hand =[]
        # create Hand object

    def __str__(self):
        s = None
        for card in self.hand:
            print "# adding %s" % str(card)
            if s:
                s = s + "," + str(card)
            else:
                s = str(card)
        return s

    def add_card(self, card):
        print "Adding card %s" % card
        self.hand.append(card)
        # add a card object to a hand

    def get_value(self):
        pass
        #aceval = 1
        #self.val1 = 0
        # count aces as 1, if the hand has an ace, then add 10 to hand value if it doesn't bust
        # compute the value of the hand, see Blackjack video

    # def draw(self, canvas, pos):
    #    pass   # draw a hand on the canvas, use the draw method for cards

card1 = Card("S", 2)
print "Card is %s" % str(card1)
card2 = Card("H", "J")
myHand = Hand()
myHand.add_card(card1)
myHand.add_card(card2)
print "Hand is %s" % str(myHand)