导入pyplay
屏幕=pygame.display.set_mode（（（800,600））

class Bullet(pygame.sprite.Sprite):
def __init__(self, x, y, direction, rect):
    pygame.sprite.Sprite.__init__(self)
    self.speed = 10
    self.image = bullet
    self.rect = rect
    self.rect.center = (x, y)
    self.direction  = direction

bullet_group=pygame。(传说中的)精灵组（）

游戏运行时：

clock.tick(FPS)

draw_bg()

enemy.draw()
enemy.update_animation()

player.update_animation()
player.draw()
player.move(move_left, move_right)

bullet_group.update()
bullet_group.draw(screen)

if player.alive: 
    if shoot:
        bullet = Bullet(player.rect.centerx, player.rect.centery, player.direction, bullerRect)
        bullet_group.add(bullet)
    if player.in_air:
        player.update_action(2)
    elif move_right or move_left:
        player.update_action(1)# 1 is run
    else:
        player.update_action(0)# 0 is idle

for event in pygame.event.get():
    if event.type == pygame.QUIT:
        gameRun = False
    
    if event.type == pygame.KEYDOWN:
        if event.key == pygame.K_a:
            move_left = True
        if event.key == pygame.K_d:
            move_right = True
        if event.key == pygame.K_SPACE:
            shoot = True
        if event.key == pygame.K_w and player.alive:
            player.jump = True
    if event.type == pygame.KEYUP:
        if event.key == pygame.K_a:
            move_left = False
        if event.key == pygame.K_d:
            move_right = False
        if event.key == pygame.K_SPACE:
            shoot = False

pygame.display.update()

错误：

Traceback（最近的调用最后）：

文件“c:\Users\gopal\Desktop\Misc Projects\main.py”，第136行，在

  bullet_group.draw(SCREEN)

文件“C:\Users\gopal\AppData\Local\Programs\Python\39\lib\site packages\pygame\sprite.py”，第546行，在绘图中

 surface.blits((spr.image, spr.rect) for spr in sprites)

TypeError:源对象必须是曲面