smtp模块使用

 import smtplib
 from email.mime.text import MIMEText
 from bs4 import BeautifulSoup
 from urllib.request import urlopen
 import time

 def sendMail(subject, body):
     msg = MIMEText(body)
     msg['Subject'] = subject
     msg['From'] = "christmas_alerts@pythonscraping.com"
     msg['To'] = "ryan@pythonscraping.com"

     s = smtplib.SMTP('localhost')
     s.send_message(msg)
     s.quit()

 bsObj = BeautifulSoup(urlopen("https://isitchristmas.com/"))
 while(bsObj.find("a", {"id":"answer"}).attrs['title'] == "NO"):
     print("It is not Christmas yet.")
     time.sleep(3600)
     bsObj = BeautifulSoup(urlopen("https://isitchristmas.com/"))
 sendMail("It's Christmas!", "According to http://itischristmas.com, it is Christmas!")

利用smtplib来检测网站的变化，然后给自己发邮件