python - クラスpythonの外でメソッドを呼び出す

Question

私はPythonとOOPに比較的慣れていません。クラスを使用してミニアドベンチャーゲームを作成しようとしていますが、BattleEngineクラスに行き詰まっています。アイデアは、キャラクターと対戦相手の「強さ」と「機知」に基づいて、対戦相手と戦うか裏切るかのオプションを用意することです。ここで攻撃メソッドを呼び出そうとすると、エラーが発生します。

class Armory(Scene):

    def enter(self):
        print "This room appears to be some kind of armory. There are shelves full of weaponry lining"
        print "the walls. You walk around admiring the shiny weapons, you reach out to pick up a"
        print "massive battleaxe. Right as your fingers touch it you hear voices from behind the"
        print "next door. They sound like they're getting closer. As the voices grow nearer you must make"
        print "a decision. Will you stand and fight (enter 'fight') or will you use your wit to outsmart"
        print "your opponent(enter 'wit')?"
        decision = raw_input("> ")
        battle = BattleEngine()
        if decision == "fight":
            attack(self, Player.strength, 3)
            if player_wins:
                print "A man in light armour walks in and sees you with your sword drawn. A look of"
                print "shock and disbelief is on his face. You act quickly and lunge at him."
                print "The soldier struggles to unsheath his sword as you run him through."
                print "He collapses to the ground wearing the same look of disbelief."
                print "Your strength has increased by 1."
                Player.strength += 1
        elif decision == "wit":
            outwit(self, Player.wit, 3)    

BattleEngine クラスを定義した場所は次のとおりです。

class BattleEngine(object):

    def attack(self, player_strength, nonplayer_strength):
        player_roll = randint(1,6)
        nonplayer_roll = randint(1,6)
        if (player_roll + player_strength) >= (nonplayer_roll + nonplayer_strength):
            return player_wins
        else: 
            return 'death'

    def outwit(self, player_wit, nonplayer_wit):
        player_roll = randint(1,6)
        nonplayer_roll = randint(1,6)
        if (player_roll + player_wit) >= (nonplayer_roll + nonplayer_wit):
            return player_wins
        else: 
            return 'death'     

プログラムでこの時点に到達すると、「攻撃のグローバル名が定義されていません」というエラーが表示されます。何が間違っているのか正確にはわかりません。どんな助けでも素晴らしいでしょう！