python外星入侵200行代码小游戏

很高兴听到你对小游戏的兴趣！下面是一个简单的外星入侵游戏，只有200行左右的Python代码：

import pygame
import random

# 初始化Pygame
pygame.init()

# 设置窗口大小
screen_width = 800
screen_height = 600
screen = pygame.display.set_mode((screen_width, screen_height))

# 加载背景图像
background_image = pygame.image.load("background.png")

# 加载玩家图像
player_image = pygame.image.load("player.png")
player_width = player_image.get_width()
player_height = player_image.get_height()

# 加载外星人图像
alien_image = pygame.image.load("alien.png")
alien_width = alien_image.get_width()
alien_height = alien_image.get_height()

# 加载子弹图像
bullet_image = pygame.image.load("bullet.png")
bullet_width = bullet_image.get_width()
bullet_height = bullet_image.get_height()

# 设置字体
font = pygame.font.Font(None, 36)

# 定义玩家类
class Player:
    def __init__(self, x, y):
        self.x = x
        self.y = y

    def draw(self):
        screen.blit(player_image, (self.x, self.y))

    def move_left(self):
        self.x -= 5
        if self.x < 0:
            self.x = 0

    def move_right(self):
        self.x += 5
        if self.x > screen_width - player_width:
            self.x = screen_width - player_width

# 定义外星人类
class Alien:
    def __init__(self, x, y):
        self.x = x
        self.y = y

    def draw(self):
        screen.blit(alien_image, (self.x, self.y))

    def move_down(self):
        self.y += 50

    def reset(self):
        self.x = random.randint(0, screen_width - alien_width)
        self.y = random.randint(-200, -alien_height)

# 定义子弹类
class Bullet:
    def __init__(self, x, y):
        self.x = x
        self.y = y

    def draw(self):
        screen.blit(bullet_image, (self.x, self.y))

    def move_up(self):
        self.y -= 10

# 创建玩家对象
player = Player(screen_width // 2 - player_width // 2, screen_height - player_height - 50)

# 创建外星人对象列表
aliens = []
for i in range(10):
    alien = Alien(random.randint(0, screen_width - alien_width), random.randint(-200, -alien_height))
    aliens.append(alien)

# 创建子弹对象列表
bullets = []

# 设置游戏结束标志
game_over = False

# 设置分数
score = 0

# 设置计时器
clock = pygame.time.Clock()

# 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_LEFT:
                player.move_left()
            elif event.key == pygame.K_RIGHT:
                player.move_right()
            elif event.key == pygame.K_SPACE:
                bullet = Bullet(player.x + player_width // 2 - bullet_width // 2, player.y)
                bullets.append(bullet)

    # 绘制背景
    screen.blit(background_image, (0, 0))

    # 绘制玩家
    player.draw()

    # 绘制外星人
    for alien in aliens:
        alien.draw()

    # 绘制子弹
    for bullet in bullets:
        bullet.draw()

    # 移动外星人
    for alien in aliens:
        alien.move_down()
        if alien.y > screen_height:
            alien.reset()
            score -= 10

    # 移动子弹
    for bullet in bullets:
        bullet.move_up()
        if bullet.y < -bullet_height:
            bullets.remove(bullet)

    # 检测碰撞
    for alien in aliens:
        for bullet in bullets:
            if bullet.x + bullet_width > alien.x and bullet.x < alien.x + alien_width and \
                bullet.y + bullet_height > alien.y and bullet.y < alien.y + alien_height:
                aliens.remove(alien)
                bullets.remove(bullet)
                score += 100

    # 绘制分数
    score_text = font.render("Score: " + str(score), True, (255, 255, 255))
    screen.blit(score_text, (10, 10))

    # 更新屏幕
    pygame.display.update()

    # 设置帧率
    clock.tick(60)

# 退出Pygame
pygame.quit()

你需要准备三张图片：`background.png`、`player.png`、`alien.png`和一张子弹的图片`bullet.png`，并将它们放在同一目录下。这个游戏只有基础功能，但足以作为一个小练习来学习Pygame的基础知识。