首先安装PIP

在Python3.6及更新的版本中，PIP已经捆绑安装了，不需要再单独安装

可以PIP升级

python -m install pip --upgrade pip

安装Pygame
打开cmd
输入

python -m pip install pygame --user

然后就开始游戏项目了
注意一下 游戏中要用到的飞船和外星人文件在(ituring.cn/book/1861)可以找到
alien_invasion.py

import pygame
from pygame.sprite import Group
from settings import Settings
from game_stats import GameStats
from scoreboard import Scoreboard
from button import Button
from ship import Ship
import game_functions as gfdef run_game():# 初始化游戏 设置并创建一个屏幕对象pygame.init()ai_settings = Settings()screen = pygame.display.set_mode((ai_settings.screen_width, ai_settings.screen_height))pygame.display.set_caption("Alien Invasion")# 创建play按钮play_button = Button(ai_settings, screen, "play")# 创建一个用于储存游戏统计信息的实例，并创建记分牌stats = GameStats(ai_settings)sb = Scoreboard(ai_settings, screen, stats)# 创建一艘飞船、一个子弹和一个外星人编组ship = Ship(ai_settings, screen)# 创建一个用于储存子弹的编组bullets = Group()aliens = Group()# 创建外星人群gf.create_fleet(ai_settings, screen, ship, aliens)#开始游戏的主循环while True:gf.check_events(ai_settings, screen, stats, sb, play_button, ship,aliens, bullets)if stats.game_active:ship.update()gf.update_bullets(ai_settings, screen, stats, sb, ship,aliens, bullets)gf.update_aliens(ai_settings, screen, stats, sb, ship,aliens, bullets) gf.update_screen(ai_settings, screen, stats, sb, ship, aliens,bullets, play_button)run_game()

settings.py

class Settings():"""存储 《《外星人入侵》》的所有设置的类"""def __init__(self):"""初始化游戏的静态设置"""# 屏幕设置self.screen_width = 1200self.screen_height = 800self.bg_color = (230, 230, 230)# 飞船的设置self.ship_limit = 3# 子弹设置self.bullet_width = 3self.bullet_height = 15self.bullet_color = 60, 60, 60self.bullets_allowed = 3# 外星人设置self.fleet_drop_speed = 10# 加游戏节奏的速度self.speedup_scale = 1.1# 外星人点数的提高速度self.score_scale = 1.5self.initialize_dynamic_settings()def initialize_dynamic_settings(self):"""初始化随游戏进行而变化的设置"""self.ship_speed_factor = 1.5self.bullet_speed_factor = 3self.alien_speed_factor = 1# fleet_direction为1表示向右移， 为-1表示向左移self.fleet_direction = 1# 记分self.alien_points = 50def increase_speed(self):"""提高速度设置和外星人点数"""self.ship_speed_factor *= self.speedup_scaleself.bullet_speed_factor *= self.speedup_scaleself.alien_speed_factor *= self.speedup_scaleself.alien_points = int(self.alien_points * self.score_scale)

ship.py

import pygame
from pygame.sprite import Spriteclass Ship(Sprite):def __init__(self, ai_settings, screen):"""初始化飞船并设置其初始位置"""super(Ship, self).__init__()self.screen = screenself.ai_settings = ai_settings# 加载飞船图像并获取其外接矩形self.image = pygame.image.load('images/ship.bmp')self.rect = self.image.get_rect()self.screen_rect = screen.get_rect()# 将每艘新飞船放在屏幕底部中央self.rect.centerx = self.screen_rect.centerxself.rect.bottom = self.screen_rect.bottom# 在飞船的属性center中存储小数指self.center = float(self.rect.centerx)# 移动标致self.moving_right = Falseself.moving_left = Falsedef update(self):"""根据移动标致调整飞船位置"""# 更新飞船的center值， 而不是rectif self.moving_right and self.rect.right < self.screen_rect.right:self.center += self.ai_settings.ship_speed_factorif self.moving_left and self.rect.left > 0:self.center -= self.ai_settings.ship_speed_factor# 根据self.center更新rect对象self.rect.centerx = self.centerdef blitme(self):"""在指定位置绘制飞船"""self.screen.blit(self.image, self.rect)def center_ship(self):"""让飞船在屏幕上居中"""self.center = self.screen_rect.centerx

game_functions.py

import sys
from time import sleep
import pygame
from bullet import Bullet
from alien import Aliendef check_keydown_events(event, ai_settings, screen, ship, bullets):"""响应按键"""if event.key == pygame.K_RIGHT:ship.moving_right = Trueelif event.key == pygame.K_LEFT:ship.moving_left = Trueelif event.key == pygame.K_SPACE:fire_bullet(ai_settings, screen, ship, bullets)elif event.key == pygame.K_q:sys.exit()		
def fire_bullet(ai_settings, screen, ship, bullets):"""如果还没有达到限制， 就发射一颗子弹"""# 创建新子弹， 并将其加入到编组bullets中if len(bullets) <= ai_settings.bullets_allowed:new_bullet = Bullet(ai_settings, screen, ship)bullets.add(new_bullet)def check_keyup_events(event, ship):"""响应松开"""if event.key == pygame.K_RIGHT:ship.moving_right = Falseelif event.key == pygame.K_LEFT:ship.moving_left = Falsedef check_events(ai_settings, screen, stats, sb, play_button, ship, aliens,bullets):"""响应按键和鼠标事件"""for event in pygame.event.get():if event.type == pygame.QUIT:sys.exit()elif event.type == pygame.KEYDOWN:check_keydown_events(event, ai_settings, screen, ship, bullets)elif event.type == pygame.KEYUP:check_keyup_events(event, ship)elif event.type == pygame.MOUSEBUTTONDOWN:mouse_x, mouse_y = pygame.mouse.get_pos()check_play_button(ai_settings, screen, stats, sb, play_button,ship, aliens, bullets, mouse_x, mouse_y)def check_play_button(ai_settings, screen, stats, sb, play_button, ship, aliens, bullets, mouse_x, mouse_y):"""在玩家单击play按钮时开始新游戏"""button_clicked = play_button.rect.collidepoint(mouse_x, mouse_y)if button_clicked and not stats.game_active:# 重置游戏设置ai_settings.initialize_dynamic_settings()# 隐藏光标pygame.mouse.set_visible(False)# 重置游戏统计信息stats.reset_stats()stats.game_active = True# 重置记分牌图像sb.prep_score()sb.prep_high_score()sb.prep_level()sb.prep_ships()# 清空外星人列表和子弹列表aliens.empty()bullets.empty()# 创建一群新的外星人，并将飞船居中create_fleet(ai_settings, screen, ship, aliens)ship.center_ship()def update_screen(ai_settings, screen, stats, sb, ship, aliens, bullets,play_button):"""更新屏幕上的图像， 并切换到新屏幕上"""# 每次循环时都重绘屏幕screen.fill(ai_settings.bg_color)# 在飞船和外星人后面重绘所有子弹for bullet in bullets.sprites():bullet.draw_bullet()ship.blitme()aliens.draw(screen)# 显示得分sb.show_score()# 如果游戏处于非活动状态，就绘制play按钮if not stats.game_active:play_button.draw_button()# 让最近绘制的屏幕可见pygame.display.flip()def update_bullets(ai_settings, screen, stats, sb, ship, aliens, bullets):"""更新子弹的位置， 并删除已消失的子弹"""# 更新子弹的位置bullets.update()# 删除已消失的子弹for bullet in bullets.copy():if bullet.rect.bottom <= 0:bullets.remove(bullet)check_bullet_alien_collisions(ai_settings, screen, stats, sb, ship,aliens, bullets)def check_bullet_alien_collisions(ai_settings, screen, stats, sb,ship, aliens, bullets):"""响应子弹和外星人的碰撞"""# 删除发生碰撞的子弹和外星人collisions = pygame.sprite.groupcollide(bullets, aliens, True, True)if collisions:for aliens in collisions.values():stats.score += ai_settings.alien_points * len(aliens)sb.prep_score()check_high_score(stats, sb)if len(aliens) == 0:# 如果整群外星人都被消灭，就提高一个等级bullets.empty()ai_settings.increase_speed()# 提高等级stats.level += 1sb.prep_level()create_fleet(ai_settings, screen, ship, aliens)def get_number_aliens_x(ai_settings, alien_width):# 计算一行可容纳多少个外星人# 外星人间距为外星人的宽度available_space_x = ai_settings.screen_width - 2 * alien_widthnumber_aliens_x = int(available_space_x / (2 * alien_width))return number_aliens_xdef get_number_rows(ai_settings, ship_height, alien_height):"""计算屏幕可容纳多少行外星人"""available_space_y = (ai_settings.screen_height - (3 * alien_height) - ship_height)number_rows = int(available_space_y / (2 * alien_height))return number_rows	def create_alien(ai_settings, screen, aliens, alien_number, row_number):# 创建一个外星人并将其加入当前行alien = Alien(ai_settings, screen)alien_width = alien.rect.widthalien.x = alien_width + 2 * alien_width * alien_numberalien.rect.x = alien.xalien.rect.y = alien.rect.height + 2 * alien.rect.height * row_numberaliens.add(alien)		def create_fleet(ai_settings, screen, ship, aliens):"""创建外星人群"""# 创建一个外星人， 并计算每行可容纳多少个外星人alien = Alien(ai_settings, screen)number_aliens_x = get_number_aliens_x(ai_settings, alien.rect.width)number_rows = get_number_rows(ai_settings, ship.rect.height, alien.rect.height)# 创建第一行外星人for row_number in range(number_rows):for alien_number in range(number_aliens_x):create_alien(ai_settings, screen, aliens, alien_number,row_number)def check_fleet_edges(ai_settings, aliens):"""有外星人到达边缘时采取相应措施"""for alien in aliens.sprites():if alien.check_edges():change_fleet_direction(ai_settings, aliens)breakdef change_fleet_direction(ai_settings, aliens):"""将整群外星人下移， 并改变他们的方向"""for alien in aliens.sprites():alien.rect.y += ai_settings.fleet_drop_speedai_settings.fleet_direction *= -1def ship_hit(ai_settings, screen, stats, sb, ship, aliens, bullets):"""响应被外星人撞到的飞船"""if stats.ships_left > 0:# 将ships_left减1stats.ships_left -= 1# 更新记分牌sb.prep_ships()# 清空外星人列表和子弹列表aliens.empty()bullets.empty()# 创建一群新的外星人，并将飞船放到屏幕底端中央create_fleet(ai_settings, screen, ship, aliens)ship.center_ship()# sleep(0.5)else:stats.game_active = Falsepygame.mouse.set_visible(True)def check_aliens_bottom(ai_settings, screen, stats, sb, ship, aliens,bullets):"""检查是否有外星人到达屏幕底端"""screen_rect = screen.get_rect()for alien in aliens.sprites():if alien.rect.bottom >= screen_rect.bottom:# 像飞船被撞到一样进行处理ship_hit(ai_settings, screen, stats, sb, ship, aliens, bullets)breakdef update_aliens(ai_settings, screen, stats, sb, ship, aliens, bullets):"""检查是否有外星人位于屏幕边缘，更新外星人群中所有外星人的位置"""check_fleet_edges(ai_settings, aliens)aliens.update()# 检测外星人和飞船之间的碰撞if pygame.sprite.spritecollideany(ship, aliens):ship_hit(ai_settings, screen, stats, sb, ship, aliens, bullets)# 检查是否有外星人到达屏幕底端check_aliens_bottom(ai_settings, screen, stats, sb, ship, aliens, bullets)def check_high_score(stats, sb):"""检查是否诞生了最高得分"""if stats.score > stats.high_score:stats.high_score = stats.scoresb.prep_high_score()

bullet.py

import pygame
from pygame.sprite import Spriteclass Bullet(Sprite):"""一个对飞船发射的子弹进行管理的类"""def __init__(self, ai_settings, screen, ship):"""在飞船所在处的位置创建一个子弹对象"""super(Bullet, self).__init__()self.screen = screen# 在(0,0)处创建一个表示子弹的矩形， 再设置正确的位置self.rect = pygame.Rect(0, 0, ai_settings.bullet_width,ai_settings.bullet_height)self.rect.centerx = ship.rect.centerxself.rect.top = ship.rect.top# 存储用小数表示的子弹位置self.y = float(self.rect.y)self.color = ai_settings.bullet_colorself.speed_factor = ai_settings.bullet_speed_factordef update(self):"""向上移动子弹"""# 更新表示子弹位置的小数值self.y -= self.speed_factor# 更新表示子弹的rect的位置self.rect.y = self.ydef draw_bullet(self):"""再屏幕上绘制子弹"""pygame.draw.rect(self.screen, self.color, self.rect)

alien.py

import pygame
from pygame.sprite import Spriteclass Alien(Sprite):"""表示单个外星人的类"""def __init__(self, ai_settings, screen):"""初始化外星人并设置其初始位置"""super(Alien, self).__init__()self.screen = screenself.ai_settings = ai_settings# 加载外星人的图像， 并设置其rect属性self.image = pygame.image.load('images/alien.bmp')self.rect = self.image.get_rect()# 每个外星人最初都是在左上角附近self.rect.x = self.rect.widthself.rect.y = self.rect.height# 存储外星人的准确位置self.x = float(self.rect.x)def blitme(self):"""在指定位置绘制外星人"""self.screen.blit(self.image, self.rect)def check_edges(self):"""如果外星人外星人位于屏幕边缘， 就返回True"""screen_rect = self.screen.get_rect()if self.rect.right >= screen_rect.right:return Trueelif self.rect.left <= 0:return Truedef update(self):"""向左或向右移动外星人"""self.x += (self.ai_settings.alien_speed_factor * self.ai_settings.fleet_direction)self.rect.x = self.x

game_stats.py

class GameStats():"""跟踪游戏的统计信息"""def __init__(self, ai_settings):"""初始化统计信息"""self.ai_settings = ai_settingsself.reset_stats()# 游戏刚启动时处于非活动状态self.game_active = False# 在任何情况下都不应该重置最高得分self.high_score = 0def reset_stats(self):"""初始化在游戏运行期间可能变化的统计信息"""self.ships_left = self.ai_settings.ship_limitself.score = 0self.level = 1

button.py

import pygame.fontclass Button():def __init__(self, ai_settings, screen, msg):"""初始化按钮的属性"""self.screen = screenself.screen_rect = screen.get_rect()# 设置按钮的尺寸和其他属性self.width, self.height = 200, 50self.button_color = (0, 255, 0)self.text_color = (255, 255, 255)self.font = pygame.font.SysFont(None, 48)# 创建按钮的rect对象， 并使其居中self.rect = pygame.Rect(0, 0, self.width, self.height)self.rect.center = self.screen_rect.center# 按钮的标签只需创建一次self.prep_msg(msg)def prep_msg(self, msg):"""将msg渲染为图像， 并使其在按钮上居中"""self.msg_image = self.font.render(msg, True, self.text_color,self.button_color)self.msg_image_rect = self.msg_image.get_rect()self.msg_image_rect.center = self.rect.centerdef draw_button(self):# 绘制一个用颜色填充的按钮，在绘制文本self.screen.fill(self.button_color, self.rect)self.screen.blit(self.msg_image, self.msg_image_rect)

scoreboard.py

import pygame.font
from pygame.sprite import Groupfrom ship import Shipclass Scoreboard():"""显示得分信息的类"""def __init__(self, ai_settings, screen, stats):"""初始化显示得分涉及的属性"""self.screen = screenself.screen_rect = screen.get_rect()self.ai_settings = ai_settingsself.stats = stats# 显示得分信息时使用的字体设置self.text_color = (30, 30, 30)self.font = pygame.font.SysFont(None, 48)# 准备包含最高得分和当前得分的图像self.prep_score()self.prep_high_score()self.prep_level()self.prep_ships()def prep_score(self):"""将得分转化为一副渲染的图像"""rounded_score = int(round(self.stats.score, -1))score_str = "{:,}".format(rounded_score)self.score_image = self.font.render(score_str, True, self.text_color,self.ai_settings.bg_color)# 将得分放在屏幕右上角self.score_rect = self.score_image.get_rect()self.score_rect.right = self.screen_rect.right - 20self.score_rect.top = 20def show_score(self):"""在屏幕上显示飞船和得分"""self.screen.blit(self.score_image, self.score_rect)self.screen.blit(self.high_score_image, self.high_score_rect)self.screen.blit(self.level_image, self.level_rect)# 绘制飞船self.ships.draw(self.screen)def prep_high_score(self):"""将最高得分转换为渲染的图像"""high_score = int(round(self.stats.high_score, -1))high_score_str = "{:,}".format(high_score)self.high_score_image = self.font.render(high_score_str, True,self.text_color, self.ai_settings.bg_color)#将最高得分放在屏幕顶部中央self.high_score_rect = self.high_score_image.get_rect()self.high_score_rect.centerx = self.screen_rect.centerxself.high_score_rect.top = self.score_rect.topdef prep_level(self):"""将等级转换为渲染的图像"""self.level_image = self.font.render(str(self.stats.level), True,self.text_color, self.ai_settings.bg_color)# 将等级放在得分下方self.level_rect = self.level_image.get_rect()self.level_rect.right = self.score_rect.rightself.level_rect.top = self.score_rect.bottom + 10def prep_ships(self):"""显示还余下多少艘飞船"""self.ships = Group()for ship_number in range(self.stats.ships_left):ship = Ship(self.ai_settings, self.screen)ship.rect.x = 10 + ship_number * ship.rect.widthship.rect.y = 10self.ships.add(ship)

然后游戏就可以运行了~
哈哈虽然有点简陋，但还是可以玩的…