I am a beginner level programmer and recently I started learning OOP,so I made a simple war gameimport randomcardsstart = 4 * range(2, 15)cardsstart.extend([15, 15]);random.shuffle(cardsstart)cardslen = len(cardsstart)/2class cards:    def __init__(self):        intializes a set of cards(deck) to the object                global cards        self.deck = [cardsstart.pop() for i in range(cardslen)]    def take(self, crd):        appends the card given to the object's list deck        crd = [crd] if type(crd) is not list else crd        self.deck.extend(crd)        random.shuffle(self.deck)    def give(self, crd):        removes the card given from the object's list deck        crd = [crd] if type(crd) is not list else crd        for i in crd:            self.deck.remove(i)player = cards()enemy = cards()while True:    raw_input()    if len(player.deck) == 0:        print 'rival won'        break    elif len(enemy.deck) == 0:        print 'you won'        break    print 'player shown his', player.deck[0]    print 'rival shown his', enemy.deck[0]    if player.deck[0] > enemy.deck[0]:        print 'player took rival\'s card'        player.take(enemy.deck[0])        enemy.give(enemy.deck[0])    elif player.deck[0] == enemy.deck[0]:        print 'WAR'        n = 3        while True:            print 'the war is on. player ruling card is {} and rival ruling card is {}'.format(player.deck[n], enemy.deck[n])            if player.deck[n] > enemy.deck[n]:                print 'player won the war'                player.take(enemy.deck[0:n])                enemy.give(enemy.deck[0:n])                break            elif player.deck[n] == enemy.deck[n]:                print 'cards are equal!another war round starting'                n += 3            else:                print 'rival won the war'                enemy.take(player.deck[0:n])                player.give(player.deck[0:n])                break    else:        print 'rival took player\'s card'        enemy.take(player.deck[0])        player.give(player.deck[0])Looking for advice on how to make it better? Any other tips?
War Games whOOP
python;beginner;game