python代码报错：'Alien' object is not iterable

最近自学python编程从入门到实践，里面有一个外星人入侵的小游戏项目，完全按照书上来的

alien_invation.py

import pygame
from pygame.sprite import Group
import sys
from settings import Settings
from ship import Ship
from alien import Alien
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 Invation')
    bg_color = (230, 230, 230)
    ship = Ship(ai_settings,screen)
    bullets = Group()
    alien = Alien(ai_settings,screen)
    while True:
        gf.check_events(ai_settings,screen,ship,bullets)
        ship.update()
        bullets.update()
        gf.update_bullets(bullets)
        gf.update_screen(ai_settings,screen,ship,alien,bullets)
run_game()

game_functions.py

import sys
import pygame
from bullet import Bullet

def check_events():
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()





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:
        fire_bullet(ai_settings,screen,ship,bullets)
    elif event.key == pygame.K_q:
        sys.exit()
def fire_bullet(ai_settings,screen,ship,bullets):
    if len(bullets) < ai_settings.bullets_allowed:
        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):
    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,*args):

    screen.fill(ai_settings.bg_color)
    for bullet in bullets:
        bullet.draw_bullet()
    ship.blitme()
    alien.blitme()
    pygame.display.flip()

def update_bullets(bullets):
    bullets.update()
    for bullet in bullets.copy():
        if bullet.rect.bottom <= 0:
            bullets.remove(bullet)

alien.py

import pygame
from pygame.sprite import Sprite
class Alien(Sprite):
    def __init__(self,ai_settings,screen):
        super(Alien,self).__init__()
        self.screen = screen
        self.ai_settings = ai_settings
        self.image = pygame.image.load('images/alien.png')
        self.rect = self.image.get_rect()
        self.rect.x = self.rect.width
        self.rect.y = self.rect.height
        self.x = float(self.rect.x)
    def blitme(self):
        self.screen.blit(self.image,self.rect)

gf.update_screen(ai_settings,screen,ship,alien,bullets) run_game() 这里多了一个参数，alien，目标函数是 def update_screen(ai_settings,screen,ship,bullets,*args): 去掉前面调用地方的 alien即可，否则update_screen 函数里把 alien 当作bulges去for循环迭代，就是你保错的原因。

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