《python编程从入门到实践》12-5练习：'Group' object has no attribute ‘xxx’

《python编程从入门到实践》12-5练习：'Group' object has no attribute ‘xxx’

错误：Traceback (most recent call last):
File "C:/Users/user/PycharmProjects/untitled/qqq/cemiansheji12-5lianxi.py", line 28, in <module>

run_game()

File "C:/Users/user/PycharmProjects/untitled/qqq/cemiansheji12-5lianxi.py", line 24, in run_game

cgf.bullets_update(bullets)

File "C:UsersuserPycharmProjectsuntitledqqqcemiansheji_game_fuctions.py", line 42, in bullets_update

bullets.bullet_update()

AttributeError: 'Group' object has no attribute 'bullet_update'

文件cemiansheji_game_fuctions:

import pygame
import sys
from qqq  import cemiansheji_bullet
def check_KEYDOWN_event(event,spacecraft,bullets,shezhi,screen):
    if event.key == pygame.K_UP:
        spacecraft.moving_up = True
    elif event.key == pygame.K_DOWN:
        spacecraft.moving_down = True
    elif event.key == pygame.K_SPACE:
        fire_bullet(bullets, shezhi, screen, spacecraft)
def check_KEYUP_event(event,spacecraft):
    if event.key == pygame.K_UP:
        spacecraft.moving_up = False
    elif event.key == pygame.K_DOWN:
        spacecraft.moving_down = False
def check_event(spacecraft,bullets,shezhi,screen):
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
        elif event.type == pygame.KEYDOWN:
            check_KEYDOWN_event(event,spacecraft,bullets,shezhi,screen)
        elif event.type == pygame.KEYUP:
            check_KEYUP_event(event,spacecraft)
def screen_update(screen,shezhi,bullets,spacecraft):
    screen.fill(shezhi.background_color)
    spacecraft.draw_spacecraft()
    for bullet in bullets.sprites():
        bullet.draw_bullet()
    pygame.display.flip()
def bullets_update(bullets):
    bullets.bullet_update()
    for bullet in bullets.copy():
        if bullet.rect.right >= 1000:
            bullets.remove(bullet)
def fire_bullet(bullets,shezhi,screen,spacecraft):
    if len(bullets) < shezhi.bullet_allowed:
        new_bullet = cemiansheji_bullet.Bullet(screen,spacecraft,shezhi)
        bullets.add(new_bullet)
##### 主体函数：

import pygame
from qqq import cemiansheji_setting
from qqq import cemiansheji_spacecraft
from qqq import cemiansheji_game_fuctions as cgf
from pygame.sprite import Group

def run_game():

# 初始化游戏并创立一个屏幕对象
pygame.init()
shezhi = cemiansheji_setting.Setting()
screen = pygame.display.set_mode((shezhi.screen_width,shezhi.screen_height))
pygame.display.set_caption("SPACECRAFT")
# 创建一艘宇宙飞船
spacecraft = cemiansheji_spacecraft.Spacecraft(shezhi,screen)
# 创立子弹编组
bullets = Group()
while True:
    # 监视键盘和鼠标事件，有方向按键就往这个方向移动并且实施
    cgf.check_event(spacecraft,bullets,shezhi,screen)
    spacecraft.spacecraft_update()
    cgf.bullets_update(bullets)
    # 每次循环都重绘屏幕
    cgf.screen_update(screen,shezhi,bullets,spacecraft)

run_game()

回答：

bullet_update => bullets_update

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