按照书上的编写的一个python的飞船游戏 代码也都是按照书上的编写的 但就不知道问题出在哪里

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

到运行飞船左右移动的时候都是没有问题的，但是到了创建子弹和发生的时候就出现问题了

下面是具体代码：

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)

到这里为止就是全部的程序了，请问哪位大佬可以指点一下，谢谢?