tkMessageBox在定時器程序中有額外的窗口

Question

我在Python中做一個計時器，但是當定時器停止時，我的代碼最終顯示兩個對話框而不是一個。我能做些什麼來避免出現額外的窗口？

代碼timer.py如下：

#!/usr/bin/python 
import time 
start = time.time() 
interval=1 

import sys 
import tkMessageBox 

def showmessage(): 
    tkMessageBox.showinfo("timer.py", "Timer Complete!") 

if __name__ == "__main__": 
    if len(sys.argv) > 1: 
     ns = {'__builtins__': None} 
     seconds=int(eval(str(sys.argv[1]), ns)) 
     if len(sys.argv) > 2: 
      if sys.argv[2]=="mins" or sys.argv[2]=="min": 
       seconds=seconds*60 

     interval = 1 if seconds < interval else interval 
     second=seconds - (time.time() - start) + 0.5 
     while second >= 0: 
      #In Python 3: print('string', end='\r') 
      if int(second/3600) > 0: 
       print "\rTime =%3d hrs %02d mins %02d sec" % \ 
        (second/3600, (second % 3600)/60, second % 60), 
      else: 
       print "\rTime =%3d mins %02d sec" % \ 
        (second/60, second % 60), 

      sys.stdout.flush() 
      time.sleep(interval) 

      if int(second % 60+0.5) == 0: 
       print #or sys.stdout.write("\n") 
      second=seconds - (time.time() - start) + 0.5 

     showmessage() 
    else: 
     print ("Usage: %s [seconds]"  % str(sys.argv[0])) 
     print ("  %s [minutes] mins" % str(sys.argv[0])) 

Answer 1

發生這種情況，因爲如果你改變showmessage以下這些URL想要一個父窗口：

def showmessage(): 
    root = tk.Tk() 
    root.withdraw() 
    tkMessageBox.showinfo("timer.py", "Timer Complete!") 
    root.destroy() 

，並添加：

import Tkinter as tk 

到你的進口，那麼你只會得到消息框