Probleme augmentation variable self

from main import nombre_tour

class player :

    def __init__(self , pseudo , health , attack , attack_increase ):
        self.pseudo = pseudo
        self.health = health
        self.attack = attack
        self.attack_increase = attack_increase

    def get_pseudo(self):
        return self.pseudo

    def get_health(self):
        return self.health

    def get_attack_value(self):
        return self.attack

    def damage(self , damage):
        self.health -= damage

    def attack_player(self , target_player):
        target_player.damage(self.attack)

    def attack_increase(self , attack_increase):
        if nombre_tour >= 6 :
         self.attack += attack_increase