python定时提醒

import threading,datetime

from tkinter import messagebox

import tkinter

def warning():

    root=tkinter.Tk()

    msg="现在时间是："+datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')+",起来喝杯水"

    result=messagebox.showwarning(title='warning',message=msg)

    root.mainloop()

def func():

    global timer

    warning()

    timer=threading.Timer(5,func)

    timer.start()

timer=threading.Timer(5,func)

timer.start()