Python窗口倒计时

拿去直接用吧，这个还是挺好用的...

# Countdown using Tkinter 
from tkinter import *
import time
import tkinter.messagebox

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="开始", command=self.start)
        self.hi_there.pack(side=LEFT)
        self.button = Button(frame, text="退出", 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):
            if k == 30:
                print("\a")
            if k== 29:
                print("\a")
            if k== 28:
                print("\a")
            lbl1["text"] = k
            root.update()
            time.sleep(1)
        lbl1.config(bg='red')
        lbl1.config(fg='white')
        lbl1["text"] = "时间到！"
        tkMessageBox.showinfo("时间到！","时间到！")

    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()