Question

我无法在课程中传递/分配值。这是我的班级定义，基本上我想根据tod（时间）改变颜色。

class Meter(tk.Canvas):

    def __init__(self,master,*args,**kwargs):
        super(Meter,self).__init__(master,*args,**kwargs)

        self.tod=tod
        self.layoutparams(tod)
        self.graphics()
        self.createhand()
        self.setrange()


    def layoutparams(self,tod):
        # set parameters that control the layout
        height = int(self['height'])
        width = int(self['width'])


        # find a square that fits in the window
        if(height*2 > width):
            side = width
        else:
            side = height*2

        # set axis for hand
        self.centrex = side/2
        self.centrey = side/2

        # standard with of lines
        self.linewidth = 2

        # outer radius for dial
        self.radius = int(0.40*float(side))

        # set width of bezel
        self.bezel = self.radius/15
        self.bezelcolour1 = 'green'
here is where i change the colour
        if (tod=='day'):
            self.bezelcolour2 = 'black'
        else:
            self.bezelcolour2 = 'white'
        self.bezelcolour3 = 'red'

        # set lengths of ticks and hand
        self.majortick = self.radius/8
        self.minortick = self.majortick/2

以下是我如何做实例

    w=Meter(self,height = 400,width = 400)
    w.tod='day'

我收到此错误

line 27, in __init__
    self.tod=tod
NameError: name 'tod' is not defined

有什么问题？

Answer 1

问题正是错误告诉你的。您将MyModel._meta.get_all_related_objects() [ f for f in MyModel._meta.get_fields() if (f.one_to_many or f.one_to_one) and f.auto_created ]的值分配给tod，但您没有名为self.tod的变量。

Answer 2

你必须写：

w=Meter(self,height = 400,width = 400, tod='day')

最好写一下：

if (self.tod=='day'):

您可能还应该添加一个函数changeTod。

Python无法在类

2 个答案: