Pygame:"Setting object has no attribute bullet"?

Question

和之前有的朋友一样参照书本做的飞船游戏，检查了函数实参。
但是在执行程序时，飞船可以正常左右移动，但是一按空格键就会弹出“setting has no attribute bullet”，想请问一下原因。

First game.py

import game_functions as gf
def run_game():
    pygame.init
    ai_settings=Settings()
    
    screen=pygame.display.set_mode((ai_settings.screen_width,ai_settings.screen_height))
    pygame.display.set_caption("Alien Invasion")
    ship=Ship(ai_settings,screen)
    bullets=Group()
    
    while True:
        
        gf.check_events(ai_settings,screen,ship,bullets)
        ship.update()
        bullets.update()
        gf.update_screen(ai_settings,screen,ship,bullets)
run_game()

Setting.py

class Settings():
    def __init__(self):
        
        self.ship_speed_factor=1.5
        
        self.screen_width=800
        self.screen_height=600
        self.bg_color=(230,230,230)
        
        
        self.bullet_speed_factor=1
        self.bullet_width       =3
        self.bullet_height      =15
        self.bullet_color       =60,60,60

bullet.py

import pygame
from pygame.sprite import Sprite

class Bullet(Sprite):
    
    def __init__(self,ai_settings,screen,ship):
        
        super(Bullet,self).__init__()
        self.screen=screen
        
        self.rect        =pygame.Rect(0,0,ai_settings.bullet_width,ai_settings.bullet.height)
        self.rect.centerx=ship.rect.centerx
        self.rect.top    =ship.rect.top
        
        self.y=float(self.rect.y)
        
        self.color       =ai_settings.bullet_color
        self.speed_factor=ai_settings.bullet_speed_factor
        
    def update(self):
        self.y     -=self.speed_factor
        self.rect.y=self.y
        
    def draw_bullet(self):
        pygame.draw.rect(self.screen,self.color,self.rect)

game_function.py

import sys
import pygame
from bullet import Bullet


def check_key_down_events(event,ai_settings,screen,ship,bullets):        
        
    if event.key==pygame.K_RIGHT:
        ship.moving_right=True
    if event.key==pygame.K_LEFT:
        ship.moving_left=True
    elif event.key==pygame.K_SPACE:
        new_bullet=Bullet(ai_settings,screen,ship)
        bullets.add(new_bullet)
        
def check_key_up_events(event,ship):    
        
    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):
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
        elif event.type == pygame.KEYDOWN:
            check_key_down_events(event,ai_settings,screen,ship,bullets)
        elif event.type == pygame.KEYUP:
            check_key_up_events(event,ship)
            
def update_screen(ai_settings,screen,ship,bullets):
    
    for bullet in bullets.sprites():
        bullet.draw_bullet()
        
    screen.fill(ai_settings.bg_color)
    ship.blitme()
    
    pygame.display.flip()

ship.py

import pygame

class Ship():
    def __init__(self,ai_settings,screen):
        self.screen=screen
        self.ai_settings=ai_settings
        
        self.image=pygame.image.load('E:\Superman.bmp')
        self.rect=self.image.get_rect()
        self.screen_rect=screen.get_rect()
        
        self.rect.centerx=self.screen_rect.centerx
        self.rect.bottom=self.screen_rect.bottom
        
        self.center=float(self.rect.centerx)
        
        self.moving_right=False
        self.moving_left =False
        
    def update(self):
        
        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
            
        self.rect.centerx=self.center
            
    def blitme(self):
        self.screen.blit(self.image,self.rect)

第一次发帖不太懂格式，请大家指正，谢谢大家了。

Answer 1

setting has no attribute bullet (ai_settings.bullet.height)

self.rect = pygame.Rect(0,0,ai_settings.bullet_width,ai_settings.bullet.height)

写错了，改成

self.rect = pygame.Rect(0,0,ai_settings.bullet_width,ai_settings.bullet_height)   

Answer 2

self.rect =pygame.Rect(0,0,ai_settings.bullet_width,ai_settings.bullet.height)
改成 self.rect = pygame.Rect(0, 0, ai_settings.bullet_width, ai_settings.bullet_height)
后面那个不是. 是 _