python - 属性错误 : member not defined python

Question

您好，我正在尝试检测是否按下了“w”键，但我一直收到错误消息，看不出哪里出错了。感谢您的建议。

  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.key 之前，您必须检查 event.type == pygame.KEYDOWN 或 event.type == pygame.KEYUP > 因为并非所有事件都定义了 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