有沒有辦法讓標籤在Python Tkinter中運行一個函數？

Question

因此，我有一個程序，它會接收最近的Outlook電子郵件，並在按下按鈕時顯示它。我想要做的是擺脫按鈕，並讓answer_label自動運行定時器功能以隨時顯示電子郵件。有什麼建議麼？

import win32com.client 
import os 
import threading # use the Timer 
import tkinter 

from tkinter import Tk, Label, Button 

class myGUI: 

    def timer(self): 

     import pythoncom   # These 2 lines are here because COM library 
     pythoncom.CoInitialize() # is not initialized in the new thread 

     outlook = win32com.client.Dispatch("Outlook.Application").GetNamespace("MAPI") 

     inbox = outlook.GetDefaultFolder(6) # "6" refers to the index of a folder - in this case, 
              # the inbox. You can change that number to reference 
              # any other folder 

     messages = inbox.Items 
     message = messages.GetLast() 
     body_content = message.Body 


     self.answer_label['text'] = (body_content) # orginally used body_content.encode("utf-8") to fixed character encoding issue 
          # caused by Windows CMD. But then figured out you can type 'chcp 65001' in cmd 
     threading.Timer(5, self.timer).start() # refresh rate goes here 


    def __init__(self, master): 
     self.master = master 
     master.title("CheckStat") 


     self.answer_label = Label(master, text='') 
     self.answer_label.place(height=300, width=300) 


     self.greet_button = Button(master, text="Start", command=self.timer) 
     self.greet_button.place(height=20, width=100) 


    def greet(self): 
     print("Greetings!") 


root = Tk() 
my_gui = myGUI(root) 
root.mainloop() 

Answer 1

您不需要明確的按鈕來運行您的計時器功能。只需在init中調用它。這段代碼適用於我（它顯示時間而不是電子郵件）。

#!/usr/bin/env python3 
# -*- coding: utf-8 -*- 

import datetime 
import threading # use the Timer 
from tkinter import Tk, Label, Button 

class myGUI: 

    def timer(self): 
     self.answer_label['text'] = datetime.datetime.now() 
     threading.Timer(5, self.timer).start() 

    def __init__(self, master): 
     self.master = master 
     master.title("CheckStat") 

     self.answer_label = Label(master, text='') 
     self.answer_label.place(height=300, width=300) 

     self.timer() 

root = Tk() 
my_gui = myGUI(root) 
root.mainloop() 

在多線程應用程序中使用tkinter時要小心。