python 定时信息提醒

remindAtTime.py

import os, sys, time, subprocess
from datetime import datetime
from tkinter import messagebox

if len(sys.argv) == 1:
    msg = input('请输入提示要做的事情\n')
    t = input('请输入到期时间, 格式：时:分:秒\n')

    hms = t.split(':') if ':' in t else t.split('：')
    h, m, s = hms

    h = 0 if int(h) >= 24 else int(h)
    m, s = min(int(m), 59), min(int(s), 59)

    now = datetime.now()
    nh, nm, ns = now.hour, now.minute, now.second

    counter = abs(h - nh) * 60 * 60 + (m - nm) * 60 + (s - ns)

    subprocess.Popen(['pythonw', __file__, msg, str(counter)])  //并没有起作用呀

else:
    time.sleep(int(sys.argv[2]))
    messagebox.showinfo('时间到了！！！', sys.argv[1])

好像并没有起作用