class Hero:
    def __init__(self,name,hp,attack):
        self.level=1
        self.name=name
        self.hp=hp
        self.attack=attack
def upgrade():
    yase.level=yase.level+1
    yase.hp=yase.hp+50
    yase.attack=yas.attack+4
yase=Hero("亚瑟",300,20)
print("亚瑟的初始血量为：",yase.hp)
upgrade()
upgrade()
print("升级；两次后，亚瑟的血量值为：",yase.hp)