在pygame中重新开始游戏

import pygame
import random

# 初始化pygame
pygame.init()

# 设置游戏窗口大小
screen_width = 800
screen_height = 600
screen = pygame.display.set_mode((screen_width, screen_height))
pygame.display.set_caption("My Game")

# 游戏状态
score = 0
game_over = False

# 加载资源
player_image = pygame.image.load("player.png")
enemy_image = pygame.image.load("enemy.png")
bullet_image = pygame.image.load("bullet.png")
background_image = pygame.image.load("background.png")

# 玩家初始位置
player_x = screen_width // 2
player_y = screen_height - 100

# 敌人初始位置
enemy_x = random.randint(0, screen_width)
enemy_y = random.randint(50, 200)

# 子弹初始位置和状态
bullet_x = player_x
bullet_y = player_y
bullet_state = "ready"

# 游戏循环
running = True
while running:
    # 事件处理
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_SPACE:
                # 发射子弹
                if bullet_state == "ready":
                    bullet_x = player_x
                    bullet_y = player_y
                    bullet_state = "fire"

    # 更新游戏状态
    if not game_over:
        # 玩家移动逻辑，省略...
        # 敌人移动逻辑，省略...
        # 子弹移动逻辑，省略...

        # 碰撞检测逻辑，省略...
        # 更新得分逻辑，省略...
        # 游戏结束逻辑，省略...

    # 绘制游戏界面
    screen.blit(background_image, (0, 0))
    screen.blit(player_image, (player_x, player_y))
    screen.blit(enemy_image, (enemy_x, enemy_y))
    screen.blit(bullet_image, (bullet_x, bullet_y))

    # 显示得分，省略...
    # 显示游戏结束文本，省略...

    pygame.display.flip()

# 游戏结束后，重新开始逻辑
if game_over:
    score = 0
    game_over = False
    player_x = screen_width // 2
    player_y = screen_height - 100
    enemy_x = random.randint(0, screen_width)
    enemy_y = random.randint(50, 200)
    bullet_x = player_x
    bullet_y = player_y
    bullet_state = "ready"

# 退出游戏
pygame.quit()