Ways to count player lives.

game.py

class Game:
    
    def __init__(self):
        self.player = Player()
        self.extra_lives = 3
        self.running = False
        
    def run(self):
        self.running = True
        while self.running
            if not self.player.alive:
                self.extra_lives += -1
            if self.extra_lives <= 0:
                self.running = False

game = Game()

game.run()

global.py

running = True
lives = 3

while running:
    run_simulation()
    if is_player_dead():
        lives += -1
    if lives <= 0:
        running = False

player.py

running = True
player = Player()

assert player.lives == 3
while running:
    run_simulation()
    if players.lives <= 0:
        running = False