_tkinter.TclError: недопустимое имя команды ".54870736.54870896.54871216.54871728"

Question

Моя программа - это приуроченная квитанция о добавлении. Он работает нормально, но это сообщение об ошибке продолжает появляться после ввода неправильного ответа (command = submit_answer). Это все сообщение об ошибке:

Exception in Tkinter callback 
Traceback (most recent call last): 
    File "C:\Users\Maggie\AppData\Local\Programs\Python\Python35-32\lib\tkinter\__init__.py", line 1549, in __call__ 
    return self.func(*args) 
    File "C:\Users\Maggie\AppData\Local\Programs\Python\Python35-32\lib\tkinter\__init__.py", line 596, in callit 
    func(*args) 
    File "C:\Users\Maggie\Documents\python\prototype2.py", line 115, in countdown 
    self.label.configure(text="%d" % self.remaining) 
    File "C:\Users\Maggie\AppData\Local\Programs\Python\Python35-32\lib\tkinter\__init__.py", line 1330, in configure 
    return self._configure('configure', cnf, kw) 
    File "C:\Users\Maggie\AppData\Local\Programs\Python\Python35-32\lib\tkinter\__init__.py", line 1321, in _configure 
    self.tk.call(_flatten((self._w, cmd)) + self._options(cnf)) 
_tkinter.TclError: invalid command name ".54870736.54870896.54871216.54871728" 

Это код моей программы:

class Add(tk.Frame): 

    def __init__(self, parent, controller): 
     tk.Frame.__init__(self, parent, background="blue") 
     button = tk.Button(self, text="Main Menu", font=LARGE_FONT, background="white", 
          command=lambda: controller.show_frame(Main)) 
     button.place(relx=0.83, rely=0.92) 

     self.button4 = tk.Button(self, text="Start Game", font=LARGE_FONT, background="white", 
          command=self.time_start) 
     self.button4.place(relx=0.4, rely=0.8, relheight=0.1, relwidth=0.2) 

     self.after_id = None 

    def time_start(self): 
     self.button4.destroy() 

     self.x = int(random.uniform(1,10)) 
     self.y = int(random.uniform(50,100)) 
     self.z = int(random.uniform(10,50)) 
     print(self.x+self.y+self.z) 

     self.qlabel = tk.Label(self, text= (self.x,"+",self.y,"+",self.z,"=",), font=WORD_FONT, bg="blue") 
     self.qlabel.place(relx=0.25, rely=0.3, relheight=0.05, relwidth=0.3) 

     self.e1 = tk.Entry(self) 
     self.e1.place(relx=0.5, rely=0.3, relheight=0.05, relwidth=0.2) 

     self.ebutton = tk.Button(self, text="Done", font=TITLE_FONT, background="white", 
          command=self.submit_answer) 
     self.ebutton.place(relx=0.35, rely=0.5, relheight=0.2, relwidth=0.3) 

     self.label = tk.Label(self, text="", width=10, font=LARGE_FONT, bg="white") 
     self.label.place(relx=0.1, rely=0.1) 
     self.remaining = 0 
     self.countdown(10) 

    def submit_answer(self): 
     a = (self.x+self.y+self.z) 
     if int(self.e1.get()) == a: 
      answerlabel = tk.Label(self, text="Correct!", font=LARGE_FONT, background="blue") 
      answerlabel.place(relx=0.42, rely=0.1, relheight=0.1, relwidth=0.2) 
      self.label.destroy() 
      self.qlabel.destroy() 
      self.e1.destroy() 
      self.ebutton.destroy() 
      self.after_cancel(self.after_id) 
      self.time_start() 
     else: 
      answerlabel = tk.Label(self, text="Game Over.", font=LARGE_FONT, background="blue") 
      answerlabel.place(relx=0.42, rely=0.1, relheight=0.1, relwidth=0.2) 
      self.ebutton.destroy() 
      self.label.destroy() 
      self.restartbutton = tk.Button(self, text="Reset Game", font=LARGE_FONT, background="white", 
            command= self.reset_game) 
      self.restartbutton.place(relx=0.65, rely=0.92) 

    def countdown(self, remaining = None): 
     if remaining is not None: 
      self.remaining = remaining 
     if self.remaining <= 0: 
      self.after_id = None 
      self.label.configure(text="Time's up!") 
      self.ebutton.destroy()   
     else: 
      self.label.configure(text="%d" % self.remaining) 
      self.remaining = self.remaining - 1 
      self.after_id = self.after(1000, self.countdown) 

    def reset_game(self): 
     self.button4 = tk.Button(self, text="Start Game", font=LARGE_FONT, background="white", 
          command=self.time_start) 
     self.button4.place(relx=0.4, rely=0.8, relheight=0.1, relwidth=0.2) 
     self.label.destroy() 
     self.qlabel.destroy() 
     self.e1.destroy() 
     self.ebutton.destroy() 
     blanklabel = tk.Label(self, background="blue") 
     blanklabel.place(relx=0.42, rely=0.1, relheight=0.1, relwidth=0.2) 
     self.restartbutton.destroy() 

Answer 1

Работа, которая была начата с after пытается изменить виджет после того, что виджет был разрушен.