给我一个用python写的飞机大战的代码

好的，以下是一个使用Python和Pygame模块编写的简单的飞机大战游戏代码示例：

import pygame
import random

# 初始化Pygame
pygame.init()

# 创建窗口
screen = pygame.display.set_mode((480, 700))

# 设置窗口标题
pygame.display.set_caption("飞机大战")

# 加载游戏背景
bg = pygame.image.load("images/background.png")

# 加载玩家飞机
player_img = pygame.image.load("images/me1.png")
player_rect = player_img.get_rect()
player_rect.centerx = 240
player_rect.bottom = 680

# 加载敌机
enemy_imgs = []
enemy_imgs.append(pygame.image.load("images/e1.png"))
enemy_imgs.append(pygame.image.load("images/e2.png"))
enemy_imgs.append(pygame.image.load("images/e3.png"))
enemies = []

# 加载子弹
bullet_img = pygame.image.load("images/bullet1.png")
bullets = []

# 设置游戏时钟
clock = pygame.time.Clock()

# 设置游戏状态
game_over = False
score = 0

# 游戏循环
while not game_over:
    # 处理事件
    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:
                # 发射子弹
                bullet_rect = bullet_img.get_rect()
                bullet_rect.centerx = player_rect.centerx
                bullet_rect.bottom = player_rect.top
                bullets.append(bullet_rect)

    # 移动玩家飞机
    keys = pygame.key.get_pressed()
    if keys[pygame.K_LEFT]:
        player_rect.centerx -= 5
    elif keys[pygame.K_RIGHT]:
        player_rect.centerx += 5
    elif keys[pygame.K_UP]:
        player_rect.bottom -= 5
    elif keys[pygame.K_DOWN]:
        player_rect.bottom += 5

    # 移动敌机
    if random.randint(0, 50) == 0:
        enemy_rect = enemy_imgs[random.randint(0, 2)].get_rect()
        enemy_rect.centerx = random.randint(0, 480)
        enemy_rect.top = 0
        enemies.append(enemy_rect)
    for enemy_rect in enemies:
        enemy_rect.top += 3

    # 移动子弹
    for bullet_rect in bullets:
        bullet_rect.top -= 5

    # 检测碰撞
    for enemy_rect in enemies:
        if enemy_rect.colliderect(player_rect):
            game_over = True
        for bullet_rect in bullets:
            if bullet_rect.colliderect(enemy_rect):
                score += 10
                bullets.remove(bullet_rect)
                enemies.remove(enemy_rect)

    # 绘制游戏场景
    screen.blit(bg, (0, 0))
    screen.blit(player_img, player_rect)
    for enemy_rect in enemies:
        screen.blit(enemy_imgs[random.randint(0, 2)], enemy_rect)
    for bullet_rect in bullets:
        screen.blit(bullet_img, bullet_rect)

    # 绘制分数
    font = pygame.font.Font(None, 36)
    score_text = font.render("Score: " + str(score), True, (255, 255, 255))
    screen.blit(score_text, (10, 10))

    # 更新屏幕
    pygame.display.flip()

    # 控制游戏帧率
    clock.tick(60)

# 结束游戏
pygame.quit()

请注意，这只是一个简单的示例，缺少某些功能（如声音和更复杂的敌人AI），但它应该可以帮助您了解如何使用Python和Pygame模块来编写2D游戏。