python实现的简单窗口倒计时界面实例

# Countdown using Tkinter 
from Tkinter import *
import time
import tkMessageBox
class App:
 def __init__(self,master):
 frame = Frame(master)
 frame.pack()
 self.entryWidget = Entry(frame)
 self.entryWidget["width"] = 15
 self.entryWidget.pack(side=LEFT)
 self.hi_there = Button(frame,text="Start",command=self.start)
 self.hi_there.pack(side=LEFT)
 self.button = Button(frame,text="QUIT",fg="red",command=frame.quit)
 self.button.pack(side=LEFT)
 def start(self):
 text = self.entryWidget.get().strip()
 if text != "":
 num = int(text)
 self.countDown(num)
 def countDown(self,seconds):
 lbl1.config(bg='yellow')
 lbl1.config(height=3, font=('times',20,'bold'))
 for k in range(seconds, 0, -1):
 lbl1["text"] = k
 root.update()
 time.sleep(1)
 lbl1.config(bg='red')
 lbl1.config(fg='white')
 lbl1["text"] = "Time up!"
 tkMessageBox.showinfo("Time up!","Time up!")
 def GetSource():
 get_window = Tkinter.Toplevel(root)
 get_window.title('Source File?')
 Tkinter.Entry(get_window, width=30,
 textvariable=source).pack()
 Tkinter.Button(get_window, text="Change",
 command=lambda: update_specs()).pack()
root = Tk()
root.title("Countdown")
lbl1 = Label()
lbl1.pack(fill=BOTH, expand=1)
app = App(root)
root.mainloop()