Libtcod python 3尝试移动角色时崩溃？

Question

我正在尝试制作一个基本的流氓风格，并遵循本教程：http://www.roguebasin.com/index.php?title=Complete_Roguelike_Tutorial,_using_python3%2Blibtcod,_part_1我尝试使用libtcod让角色对鼠标移动做出响应。我按照教程操作，一切进展顺利，我的角色出现在屏幕上，但由于某种原因，当我试图执行移动命令时，程序崩溃了。作为参考，我的代码如下：

import libtcodpy as tcod

SCREEN_WIDTH = 80
SCREEN_HEIGHT = 50
LIMIT_FPS = 20

font_path = 'arial10x10.png'  # this will look in the same folder as this script
font_flags = tcod.FONT_TYPE_GREYSCALE | tcod.FONT_LAYOUT_TCOD  # the layout may need to change with a different font file
tcod.console_set_custom_font(font_path, font_flags)

window_title = 'Python 3 libtcod tutorial'
fullscreen = False
tcod.console_init_root(SCREEN_WIDTH, SCREEN_HEIGHT, window_title, fullscreen)


playerx = SCREEN_WIDTH // 2
playery = SCREEN_HEIGHT // 2


def handle_keys():

    # movement keys
 key = tcod.console_check_for_keypress()
if tcod.console_is_key_pressed(tcod.KEY_UP):
    playery = playery - 1

elif tcod.console_is_key_pressed(tcod.KEY_DOWN):
    playery = playery + 1

elif tcod.console_is_key_pressed(tcod.KEY_LEFT):
    playerx = playerx - 1

elif tcod.console_is_key_pressed(tcod.KEY_RIGHT):
    playerx = playerx + 1

while not tcod.console_is_window_closed():

   tcod.console_set_default_foreground(0, tcod.white)
   tcod.console_put_char(0, playerx, playery, '@', tcod.BKGND_NONE)

   tcod.console_flush()

   exit = handle_keys()
   if exit:
        break    

我把这个问题发到了另一个论坛上，他们说我应该把playerx和playery定义为全局的，所以我把它添加到了handle_keys()函数中，但它在启动时就崩溃了。

Answer 1

下面是handle_keys函数中的修复方法：

您还缺少全局赋值，并且对键值使用了不正确的检查

def handle_keys():
    global playerx, playery

    # movement keys
    key = tcod.console_check_for_keypress()

    if key.vk == tcod.KEY_UP:
        playery = playery - 1

    elif key.vk == tcod.KEY_DOWN:
        playery = playery + 1

    elif key.vk == tcod.KEY_LEFT:
        playerx = playerx - 1

    elif key.vk == tcod.KEY_RIGHT:
        playerx = playerx + 1

顺便说一句，这里现在有一个更新的python3教程：http://rogueliketutorials.com