无法发射子弹，程序关闭

Question

我是Python的初学者，正在开发一个太空入侵者游戏。我想让船发射子弹，但是当我按下射击键时，没有子弹被击中。多次按下后，程序关闭。

AlienGame.py

import sys
import pygame
from pygame.sprite import Group
from settings import Settings
from ship import Ship
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("TemplAReeb's First Game")
    ship = Ship(ai_settings, screen)
    bullets = Group()
    bg_color = (230, 230, 230)
   while True:
        gf.check_events(ship, bullets)
        ship.update()
        bullets.update()
        gf.update_screen(ai_settings, screen, ship, bullets)
        screen.fill(bg_color)
        ship.blitme()
        pygame.display.flip()
        for event in pygame.event.get():
            if event.type==pygame.QUIT:
                sys.exit()
        screen.fill(bg_color)
        ship.blitme()
        pygame.display.flip()
run_game()

gamefunctions.py

import sys
import pygame
from bullet import Bullet
def check_keydown_events (event, bullets):
    if event.key == pygame.K_SPACE:
        new_bullet = Bullet(ai_settings, screen, ship)
        bullets.add(new_bullet)
def check_events(ship, bullets):
    keys = pygame.key.get_pressed()
    ship.moving_right = keys[pygame.K_RIGHT]
    ship.moving_left = keys[pygame.K_LEFT]
    for event in pygame.event.get():
        if event.type ==  pygame.KEYDOWN:
         check_keydown_events(event, bullets)

def update_screen(ai_settings, screen, ship, bullets):
    bg_color = (230, 230, 230)
    screen.fill(bg_color)
    ship.blitme()
    for bullet in bullets.sprites():
        bullet.draw_bullet()
    pygame.display.flip()

我收到未定义ai_settings的错误

Traceback (most recent call last):
  File "C:/Users/Areeb Irfan/.PyCharmCE2018.3/config/scratches/AlienGame.py", line 32, in <module>
run_game()
  File "C:/Users/Areeb Irfan/.PyCharmCE2018.3/config/scratches/AlienGame.py", line 19, in run_game
gf.check_events(ship, bullets)
  File "C:UsersAreeb Irfan.PyCharmCE2018.3configscratchesgame_functions.py", line 16, in check_events
check_keydown_events(event, bullets)
  File "C:UsersAreeb Irfan.PyCharmCE2018.3configscratchesgame_functions.py", line 7, in check_keydown_events
new_bullet = Bullet(ai_settings, screen, ship)
NameError: name 'ai_settings' is not defined

Answer 1

您的错误来自check_keydown_events中的这一行：

    new_bullet = Bullet(ai_settings, screen, ship)

您尝试将ai_settings传递给 Bullet 构造函数，但它未在当前 check_keydown_events 函数的命名空间中定义。与update_screen不同，您不会将ai_settings作为参数传入。

您可能需要解决此问题。您已经知道如何操作，因为您已经将ai_settings传递给update_screen(当前未使用它的地方，您是否可能将其添加到错误的位置？您只需要将其扩展到 check_events 和 check_keydown_events .