class Player:
        maxHP = 800.0
        HP = maxHP
        exp = 0.0
        nextlvl = 100.0
        attack = 75.0
        def eattack(self):   #должна изменять HP противника, не работает
                enemy.HP -= self.attack
class SDragon:
        HP = 375.0
        attack = 50.0
        dieexp = 450.0
        def pattack(self):   #должна изменять HP игрока, не работает
                player.HP = player.HP - self.attack
player = Player
isEnemy = False
while True:
    if isEnemy == False:
        enemy = SDragon
        isEnemy = True
    enemy.pattack    #те функции
    player.eattack   #те функции
    print("You've attacked enemy!")
    print("Enemy has attacked you!")
    print("Your HP is", player.HP, "                                     Enemy's HP is", enemy.HP)         #При каждом прогоне цикла HP не изменяется
    x = input("Press ENTER button to continue")