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跟着小甲鱼敲的代码,哪里的问题啊 
- import pygame
 
 - import sys
 
 - import traceback
 
 - from pygame.locals import *
 
  
- pygame.init()
 
 - pygame.mixer.init()
 
  
- bg_size = width,height = 480,700
 
 - screen = pygame.display.set_mode(bg_size)
 
 - pygame.display.set_caption("飞机大战")
 
  
- background = pygame.image.load("images/background.png").convert
 
  
- #载入游戏音乐
 
 - pygame.mixer.music.load("sound/game_music.ogg")
 
 - pygame.mixer.music.set_volume(0.2)
 
 - bullet_sound = pygame.mixer.Sound("sound/bullet.wav")
 
 - bullet_sound.set_volume(0.2)
 
 - bomb_sound = pygame.mixer.Sound("sound/use_bomb.wav")
 
 - bomb_sound.set_volume(0.2)
 
 - supply_sound = pygame.mixer.Sound("sound/supply.wav")
 
 - supply_sound.set_volume(0.2)
 
 - get_bomb_sound = pygame.mixer.Sound("sound/get_bomb.wav")
 
 - get_bomb_sound.set_volume(0.2)
 
 - get_bullet_sound = pygame.mixer.Sound("sound/get_bullet.wav")
 
 - get_bullet_sound.set_volume(0.2)
 
 - upgrade_sound = pygame.mixer.Sound("sound/upgrade.wav")
 
 - upgrade_sound.set_volume(0.2)
 
 - enemy3_fly_sound = pygame.mixer.Sound("sound/enemy3_flying.wav")
 
 - enemy3_fly_sound.set_volume(0.2)
 
 - enemy1_down_sound = pygame.mixer.Sound("sound/enemy1_down.wav")
 
 - enemy1_down_sound.set_volume(0.2)
 
 - enemy2_down_sound = pygame.mixer.Sound("sound/enemy2_down.wav")
 
 - enemy2_down_sound.set_volume(0.2)
 
 - enemy3_down_sound = pygame.mixer.Sound("sound/enemy3_down.wav")
 
 - enemy3_down_sound.set_volume(0.5)
 
 - me_down_sound = pygame.mixer.Sound("sound/me_down.wav")
 
 - me_down_sound.set_volume(0.2)
 
  
- def main():
 
 -     pygame.mixer.music.play(-1)
 
  
-     clock = pygame.time.Clock()
 
  
-     running = True
 
  
-     while running:
 
 -         for event in pygame.event.get():
 
 -             if event.type == QUIT:
 
 -                 pygame.quit()
 
 -                 sys.exit()
 
  
-         screen.blit(background, (0,0))
 
  
-         pygame.display.flip()
 
  
-         clock.tick(60)
 
  
- if __name__ == "__main__":
 
 -     try:
 
 -         main()
 
 -     except SystemError:
 
 -         pass
 
 -     except:
 
 -         traceback.print_exc()
 
 -         pygame.quit()
 
 -         input()
 
  复制代码 
显示异常:TypeError: argument 1 must be pygame.Surface, not builtin_function_or_method  
怎么办,我好慌,说第一个参数是Surface对象,不是内置函数或方法欸
background = pygame.image.load("images/background.png").convert() 
convert漏了括号 
 
 
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