我一直在學習Python3，希望有一天能開發游戲。所以我在做一些項目來練習。我遇到麻煩了class bs:

turn = 0

def battle():

if player.hp and monster.hp > 0:

def playerattack():

monster.hp - (player.att - monster.dfn)

print("You attack! Monster has " + monster.hp + "hp")

def monsterattack():

player.hp - (monster.att - player.dfn)

print("You have been hit! You have " + player.hp + "hp")

if turn == 0:

print("It is your turn what will you do? 1) Attack!")

if input == 1:

playerattack()

else:

print("That is not a valid option..")

else:

print("It is your opponent's turn..")

monsterattack()

elif monster.hp < 1:

print(" You have won the battle!")

monster.reward()

player.lvlup()

elif player.hp < 1:

print(" You lose!")Traceback (most recent call last):

File "/home/necrosynth/test.py", line 39, in

class bs:

File "/home/necrosynth/test.py", line 40, in bs

turn == 0

NameError: name 'turn' is not defined

我想為一個游戲做一個基本的戰斗系統。。當回合為0時，是玩家回合，1回合是怪物回合

請幫我修正這個錯誤。如果你有任何建議，請隨時發表意見。謝謝！在

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