小编Coo*_*elp的帖子

这是我的第一个问题,很抱歉......我是python和编码的初学者,我想创建一个名为'Map'的类,它将具有以下类变量:

class Map:
    height = 11  
    width = 21

    top = [['#']*width]
    middle = [['#']+[' ']*(width-2)+['#'] for i in range(height-2)]
    field = top + middle + top

b = Map()

Shell:
>>> middle = [['#']+[' ']*(width-2)+['#'] for i in range(height-2)]
    NameError: name 'width' is not defined

如果我将变量放在类之外就可以了.我究竟做错了什么？？

谢谢您的帮助.