【Python】《外星人入侵》代码照着书敲的，但是没有子弹打出来,求助 : 找不到指定的模块。

Question

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_height))    
    pygame.display.set_caption("Alien Invasion")
    
    #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()
    
    #设置背景色
    bg_color=(230,230,230)
    
    #开始游戏的主循环
    while True:
        gf.check_events(ai_settings,screen,ship,bullets)
        ship.update()
        bullets.update()
        gf.update_screen(ai_settings,screen,ship,bullets)
        
run_game()

#-*-coding:gb2312-*-
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_height=800
        self.bg_color=(230,230,230)
        
        #飞船设置
        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
        

#-*-coding:gb2312-*-
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.png')
        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.center更新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)

#-*-coding:gb2312-*-
import sys
import pygame
from bullet import Bullet

def check_keydown_events(event,ai_settings,screen,ship,bullets):
    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):
    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):
    """响应案件和鼠标事件"""
    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)
            
def update_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，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()

#-*-coding:gb2312-*-
import pygame
from pygame.sprite import Sprite

class 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)处创建一个标识子弹的矩形，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.centerx
        self.rect.top = ship.rect.top
        
        #存储用小数表示的子弹的位置
        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)

报错：

bullet.draw_bullet()

File "c:UsersmikeDocumentsPythonWorkSpacePygamebullet.py", line 18, in draw_bullet

pygame.draw.rect(self.screen, self.color, self.rect)

File "E:pythonlibsite-packagespygame__init__.py", line 100, in getattr

raise NotImplementedError(missing_msg)

NotImplementedError: draw module not available (ImportError: DLL load failed: 找不到指定的模块。)

Answer 1

defupdate_screen(ai_settings, screen, ship, bullets):

    screen.fill(ai_settings.bg_color)

for bullet in bullets.sprites():#代码位置换了一下就好了

        bullet.draw_bullet()

    ship.blitme()

    pygame.display.flip()