A python spaceship game written according to the book. The code is also written according to the book, but I don’t know where the problem lies.

AttributeError: 'Ship' object has no attribute 'bullet_width'

There is no problem when running the spacecraft to move left and right, but when it comes to creating bullets and triggering, problems arise
The following is the specific code:

alien_invasion.py

import sys import pygame from pygame.sprite import Group from settings import Settings from ship import Ship import game_functions as gf def run_game(): #初始化pygame、设置和屏幕对象 pygame.init() ai_settings = Settings() screen = pygame.display.set_mode((ai_settings.screen_width, ai_settings.screen_hight)) pygame.display.set_caption("Alien Invavsion") #设置背景色 bg_color=(230,230,230) #创建一艘飞船 ship = Ship(ai_settings, screen) #创建一个用于存储子弹的编组 bullets = Group() #开始游戏的主循环 while True: #监视键盘和鼠标事件 gf.check_events(ai_settings, screen, ship, bullets) ship.update() bullets.update() gf.updata_screen(ai_settings, screen, ship, bullets) run_game()

settings.py

class Settings(): """存储《外星人入侵》的所有设置的类""" def __init__(self): """初始化游戏的设置""" #屏幕设置 self.screen_width = 1200 self.screen_hight = 700 self.bg_color = (250,250,250) #飞船的位置 self.ship_speed_factor = 1.5 #子弹设置 self.bullet_speed_factor = 1 self.bullet_width = 3 self.bullet_height = 15 self.bullet_color = 60, 60, 60

game_functions.py

import sys from bullet import Bullet import pygame def check_keydown_events(event, ai_settings, screen, ship, bullets): """响应按键""" if event.key == pygame.K_RIGHT: ship.moving_right = True elif event.key == pygame.K_LEFT: ship.moving_left = True elif event.key == pygame.K_SPACE: #创建一颗子弹，并将其加入到编组bullets中 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 = False elif event.key == pygame.K_LEFT: ship.moving_left = False def check_events(ai_settings, screen, ship, 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, ship, screen, bullets, ai_settings) elif event.type == pygame.KEYUP: check_keyup_events(event,ship) def updata_screen(ai_settings, screen, ship, bullets): """更新屏幕上的图像，并切换到新屏幕""" # 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() # 让最近绘制的屏幕可见 pygame.display.flip()

ship.py

import pygame class Ship(): def __init__(self, ai_settings, screen): """初始化飞船并设置其初始位置""" self.screen=screen self.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.centerx self.rect.bottom = self.screen_rect.bottom #在飞船的属性center中存储小数值 self.center = float(self.rect.centerx) #移动标志 self.moving_right = False self.moving_left = False def update(self): """根据移动标志调整飞船的位置""" #更新飞船的center值，而不是rect if self.moving_right and self.rect.right < self.screen_rect.right: self.center += self.ai_settings.ship_speed_factor if self.moving_left and self.rect.left > 0: self.center -= self.ai_settings.ship_speed_factor #根据self.centerx跟新的rect对象 self.rect.centerx = self.center def blitme(self): """在指定位置绘制飞船""" self.screen.blit(self.image, self.rect)

bullet.py

import pygame from pygame.sprite import Sprite class Bullet(Sprite): """一个对飞船发射子弹的进行管理的类""" def __init__(self, ai_settings, screen, ship): """在飞船所处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移动的矩形，再设置正确的位置 self.rect = pygame.Rect(0, 0, ai_settings.bullet_width, ai_settings.bullet_height) self.rect.conterx = ship.rect.centerx self.rect.top = ship = 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_color self.speed_factor = ai_settings.bullet_speed_factor def 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.y def draw_bullet(self): """在屏幕上绘制子弹""" pygame.draw.rect(self.screen, self.color, self.rect)

That’s all the procedures so far. Can anyone give me some advice? Thank you.

def check_keydown_events(event, ai_settings, screen, ship, bullets): new_bullet = Bullet(ai_settings, screen, ship)