Question

您好，我试图检测＆＃34; w＆＃34;按下键，我不断收到错误，无法查看我出错的地方。感谢你的建议。

  while 1: 
    for event in pygame.event.get():
      if event.type == pygame.QUIT: 
        sys.exit()
      if event.key == pygame.K_w:    #line 82
        player.walkNorthAnimation()
        t.displayTree()

错误是：

Traceback (most recent call last):
  File "unnamed.py", line 91, in <module>
    main()
  File "unnamed.py", line 82, in main
    if event.key == pygame.K_w:
AttributeError: event member not defined

Answer 1

在使用event.type == pygame.KEYDOWN之前，您必须先检查event.type == pygame.KEYUP或event.key，因为并非所有事件都已定义event.key。

while True: 
    for event in pygame.event.get():
        if event.type == pygame.QUIT: 
            sys.exit()
        elif event.type == pygame.KEYDOWN: 
            if event.key == pygame.K_w:    #line 82
                player.walkNorthAnimation()

请参阅PyGame文档：Event

QUIT             none
ACTIVEEVENT      gain, state
KEYDOWN          unicode, key, mod
KEYUP            key, mod
MOUSEMOTION      pos, rel, buttons
MOUSEBUTTONUP    pos, button
MOUSEBUTTONDOWN  pos, button
JOYAXISMOTION    joy, axis, value
JOYBALLMOTION    joy, ball, rel
JOYHATMOTION     joy, hat, value
JOYBUTTONUP      joy, button
JOYBUTTONDOWN    joy, button
VIDEORESIZE      size, w, h
VIDEOEXPOSE      none
USEREVENT        code

Answer 2

使用dir(event)显示事件的属性，以查看event.key是否确实存在。

属性错误：成员未定义python

2 个答案: