运行成功后K_SPACE没有生效，但是左右键和退出都可以成功

Question

import sys
import pygame
from bullet import Bullet

def check_events(ai_settings, screen, ship, bullets):
    """响应按键和鼠标事件"""
    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_setting, screen, ship, bullets):
    """更新屏幕上的图像，并切换到新屏幕"""
    # 每次循环时都重新绘制屏幕
    screen.fill(ai_setting.bg_color)
    ship.blitme()
    # 让最近绘制的屏幕可见
    pygame.display.flip()
    # 在飞船和外星人后面重新绘所有子弹
    for bullet in bullets.sprites():
        bullet.draw_bullet()
    ship.blitme()

def check_keydown_events(event, ai_settings, screen, ship, bullets):
    """响应按键"""
    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
        fir_bullet(ai_settings, screen, ship, bullets)
    elif event.key == pygame.K_q:
        sys.exit()


def fir_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):
    """响应松开"""
    if event.key == pygame.K_RIGHT:
        ship.moving_right = False
    elif event.key == pygame.K_LEFT:
        ship.moving_left = False
        
def update_bullets(bullets):
    """更新子弹的位置，并删除已消失的子弹"""
    # 更新子弹的位置
    bullets.update()

    # 删除已消失的子弹
    for bullet in bullets.copy():
        if bullet.rect.bottom <= 0:
            bullets.remove(bullet)

elif event.key == pygame.K_SPACE:
    # 创建一颗子弹，并将其加入到编组bullets中
    fir_bullet(ai_settings, screen, ship, bullets)

运行成功后K_SPACE没有生效，但是左右键和退出都可以成功

Answer 1

找到问题所在了

23行这句代码要放在19行的位置