Python Tkinter 弹出窗口运行，但仅有时出现

Question

我的 Tkinter pop_up 方法似乎按预期自行运行，并放置在调用它的方法中的替代行中。但是当放置在需要的地方时，弹出窗口不会显示。它可以看到运行时带有调试打印输出，但不弹出。

   
`  def pop_up(self, instruction):
        root = Tk()
        root.geometry("500x250")
        root.title("Cheese Time")

        def button_command():
            global instruction_exe_time
            t = strptime(entry.get()) # timeobject
            instruction_exe_time= mktime(t) # time in seconds
            self.set_time(instruction[0],instruction_exe_time)
            print(ctime(instruction_exe_time))
            root.destroy() 

        label_instruction = Label(root, text = instruction[1][0], font=('Helvetica 12 bold'))
        label_instruction.pack(pady=20)
        label = Label(root, text = "Enter time of execution:", font= ('Helvetica 10 bold')) 
        label.pack(pady= 10)

        entry = Entry(root, width = 22, font=('Helvetica 14 bold'))
        entry.insert(10,f"{ctime()}")
        entry.pack(pady=10)

        button = Button(root, text= "OK", command=lambda:button_command(), font= ('Helvetica 14 bold'))
        button.pack(pady=20, padx=20)
        root.mainloop()`

    # @threaded              
    def make_cheese(self):
        print("Press enter to continue or 'A' to enter time of execution")
        
        for instruc in self.instructions.items():
            # self.pop_up(instruc) pop_runs when placed here also makes other pop_up calls run
            if instruc[1][1] == True:
                self.sleep_adjust(instruc[0])
                #sleep(10) #instruc[1][2]
                print(instruc[0], ": ", instruc[1][0])
                self.pop_up(instruc) # does not work here 
            else:
               # self.pop_up(instruc) pop_up also runs properly when placed here and makes other pop_ups run
                print(instruc[0], ": ",instruc[1][0])
                input1 = input()
                
                if input1 == "A" or input1 == "a":
                    self.pop_up(instruc) # does not work here
                else:
                    self.set_time(instruc[0],time())
            self.set_done(instruc[0])

将 pop_up 方法放置在调用它的方法的替代部分中时，运行它，然后在需要的地方正确运行其他调用。

是什么阻止了它的显示？

Answer 1

在这里，不要创建

Tk()

的多个实例，因为它只能创建一次。相反，要创建多个窗口，请使用

Toplevel()

创建实例。

希望有帮助！