给我用python写一个飞机大战小游戏

好的，以下是Python的飞机大战小游戏示例代码：

import pygame
import random

# 初始化 pygame
pygame.init()

# 创建游戏窗口
width, height = 480, 700
screen = pygame.display.set_mode((width, height))

# 设置游戏窗口标题
pygame.display.set_caption("飞机大战")

# 载入游戏背景图像
bg_img = pygame.image.load("images/background.png")

# 载入游戏音乐
pygame.mixer.music.load("sounds/game_music.ogg")
pygame.mixer.music.play(-1) # 循环播放

# 载入游戏音效
bullet_sound = pygame.mixer.Sound("sounds/bullet.wav")
enemy1_down_sound = pygame.mixer.Sound("sounds/enemy1_down.wav")
game_over_sound = pygame.mixer.Sound("sounds/game_over.wav")

# 字体设置
font = pygame.font.Font(None, 36)
gameover_font = pygame.font.Font(None, 48)

# 定义颜色变量
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
GREEN = (0, 255, 0)
RED = (255, 0, 0)

# 定义玩家飞机类
class Player(pygame.sprite.Sprite):
    def __init__(self):
        super().__init__()
        self.image = pygame.image.load("images/player.png").convert_alpha()
        self.rect = self.image.get_rect()
        self.rect.left = (width - self.rect.width) // 2
        self.rect.top = height - self.rect.height - 50
        self.speed = 5
        self.bullets = pygame.sprite.Group()

    def update(self):
        keys = pygame.key.get_pressed()
        if keys[pygame.K_UP] and self.rect.top > 0:
            self.rect.top -= self.speed
        if keys[pygame.K_DOWN] and self.rect.bottom < height:
            self.rect.bottom += self.speed
        if keys[pygame.K_LEFT] and self.rect.left > 0:
            self.rect.left -= self.speed
        if keys[pygame.K_RIGHT] and self.rect.right < width:
            self.rect.right += self.speed

    def shoot(self):
        bullet = Bullet(self.rect.centerx, self.rect.top)
        self.bullets.add(bullet)
        bullet_sound.play()

# 定义子弹类
class Bullet(pygame.sprite.Sprite):
    def __init__(self, x, y):
        super().__init__()
        self.image = pygame.image.load("images/bullet.png").convert_alpha()
        self.rect = self.image.get_rect()
        self.rect.centerx = x
        self.rect.bottom = y
        self.speed = -10

    def update(self):
        self.rect.top += self.speed
        if self.rect.bottom < 0:
            self.kill()

# 定义敌机类
class Enemy(pygame.sprite.Sprite):
    def __init__(self):
        super().__init__()
        self.image = pygame.image.load("images/enemy1.png").convert_alpha()
        self.rect = self.image.get_rect()
        self.rect.left = random.randint(0, width - self.rect.width)
        self.rect.bottom = 0
        self.speed = random.randint(2, 6)

    def update(self):
        self.rect.top += self.speed
        if self.rect.top > height:
            self.kill()

# 创建精灵组
all_sprites = pygame.sprite.Group()
player = Player()
enemies = pygame.sprite.Group()

# 将玩家飞机和敌机加入精灵组
all_sprites.add(player)

# 设置游戏时钟
clock = pygame.time.Clock()

# 设置游戏结束标志位
game_over = False

# 游戏主循环
while not game_over:

    # 事件循环
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            game_over = True
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_SPACE:
                player.shoot()

    # 更新所有精灵
    all_sprites.update()

    # 检测子弹是否击中敌机
    hits = pygame.sprite.groupcollide(player.bullets, enemies, True, True)
    for hit in hits:
        enemy1_down_sound.play()
        enemies.add(Enemy())
    
    # 检测玩家飞机是否撞上敌机
    hits = pygame.sprite.spritecollide(player, enemies, True)
    if hits:
        game_over_sound.play()
        game_over = True
    
    # 生成新的敌机
    if len(enemies) < 5:
        enemies.add(Enemy())

    # 绘制游戏画面
    screen.blit(bg_img, (0, 0))

    all_sprites.draw(screen)
    for enemy in enemies:
        screen.blit(enemy.image, enemy.rect)
    
    score_txt = font.render("Score: {}".format(len(player.bullets)), True, WHITE)
    screen.blit(score_txt, (10, 10))

    # 更新窗口内容
    pygame.display.update()

    # 限制游戏帧数为60帧
    clock.tick(60)

# 游戏结束
gameover_txt = gameover_font.render("Game Over", True, RED)
screen.blit(gameover_txt, ((width - gameover_txt.get_width()) // 2, (height - gameover_txt.get_height()) // 2))
pygame.display.update()

# 等待2秒
pygame.time.wait(2000)

# 退出游戏
pygame.quit()

提示：代码中需要用到一些图片和音频文件，可以按照代码中指定的路径放置文件。也可以自行调整路径。