<?xml version="1.0"?>
<data>
    <work name="work1">
        <message>上課</message>
        <showtime>2017-11-04 11:38:20</showtime>
    </work>
    <work name="work2">
        <message>參加XXX會議</message>
        <showtime>2017-11-04 11:38:22</showtime>
    </work>
    <work name="work3">
        <message>參加XXX聚會</message>
        <showtime>2017-11-04 11:38:25</showtime>
    </work>
</data>

# _*_ encoding:utf-8 _*_
__data__ = ‘ 8:58‘

import os,sys
from datetime import datetime
import xml.etree.cElementTree as ET


class ClockMsg():

    def ShowMsg(self, message):
        print (message)

    def WaitTime(self, message, showtime):
        strnext_time = datetime.strptime(showtime, "%Y-%m-%d %H:%M:%S") #提醒時間
        while True:
            str_now = datetime.now()  #獲取當前時間
            str_now_time = str_now.strftime(‘%Y-%m-%d %H:%M:%S‘)

　　　　　　　if str(str_now_time) > str(strnext_time):

　　　　　　　　　　self.ShowMsg("輸入時間不能早於當前時間")

    　　　　　　　　return

            if str(str_now_time) == str(strnext_time):
                self.ShowMsg(message)
                return

    def GetMsg(self):
        tree = ET.parse("message.xml") #打開xml文檔
        root = tree.getroot()   #獲得root節點
        for work in root.findall(‘work‘):   #找到root節點下的所有work節點
            message = work.find(‘message‘).text    #子節點下節點message的值
            showtime = work.find(‘showtime‘).text   #子節點下節點showtime的值
            self.WaitTime(message, showtime)

if __name__ == "__main__":
    clockmsg = ClockMsg()
    clockmsg.GetMsg()

Python編寫某個時刻完成某個任務