python - Python不断显示 'object has no such attribute'

Question

由于某些原因，执行以下代码行时，会出现错误说明:'car'对象没有属性'time_int'该类称为car。

尽管我将方法包括在同一个类中，但是每次尝试调用self.time_int时，上面都会出现错误，这是代码片段:

# the __init__ also has the buttons that connect to other methods, but I just included the relevant one

    class car:


    def __init__(self,master):

        self.helv = tkinter.font.Font(family ="Helvetica", size = 20, weight = 'bold')

        self.master = master

        master.title('RC car controls')
        self.background_image = PhotoImage(file='1.gif') #upload background picture
        self.background_label = Label(master, image=self.background_image)
        self.background_label.image = self.background_image
        self.background_label.place(x=0,y=0,relwidth=1, relheight=1) #placing of background picture
        master.geometry("500x500")
        master.resizable(0, 0)

        self.acl = Button(master, command = lambda:    [self.set_down(),self.set_up()], image = self.img,
                      padx = 4, pady = 4)
        self.acl.place(relx = 0.7, rely = 0.5)


    def set_down(self):
        self.acl.bind('<Button-1>', self.accel_gn)


    def set_up(self):
        self.acl.bind('<ButtonRelease-1>',self.accel_fn)

    def accel_fn(self,accel_fn):  ##### ACCELERATION SLOWS DOWN
        self.start = time()
        print('up')
        self.time_int = (self.start-self.end)
        print(self.time_int)

    def accel_gn(self,accel_gn): ##### ACCELERATION INCREASES
        self.end = time()
        a = speed()
        print('down')
        if 1 > self.time_int > 0:
            print('current motor speed:', a.final_speed())

错误在if语句行的第二种方法 accel_gn(self,accel_gn)中发生。为了明确起见，该按钮基本上检查了按下按钮的时间，并在另一个名为final_speed()的类中调用一个方法。

谢谢

编辑:当我第二次在空闲状态下按下按钮时，它将继续运行，并且错误不会停止它。仅在第一次单击按钮时 pop 错误。

Answer 1

我认为您需要在self.time_int中定义accel_gn