Python 监控主机程序，异常后发送邮件（我的第一只Python程序）

#-*- encoding:utf-8 -*- #!/usr/bin/env python # name IsOpen.py import os import socket import t

#-*- encoding:utf-8 -*-  
#!/usr/bin/env python  
# name IsOpen.py  
import os  
import socket  
import time  
import smtplib    
from email.mime.text import MIMEText  
 
mailto_list=["rootliu@****.com"]   
mail_host="smtp.****.com"  #设置服务器  
mail_user="rootliu@****.com"    #用户名  
mail_pass="******"   #口令   
mail_postfix="****.com"  #发件箱的后缀  
    
def send_mail(mailto_list,sub,content):  #to_list：收件人；sub：主题；content：邮件内容  
    me="VPN Server  is down"+"<"+mail_user+"@"+mail_postfix+">"   #这里的hello可以任意设置，收到信后，将按照设置显示  
    msg = MIMEText(content,_subtype='html',_charset='gb2312')    #创建一个实例，这里设置为html格式邮件  
    msg['Subject'] = sub    #设置主题  
    msg['From'] = me    
    msg['To'] = ";".join(mailto_list)    
    try:    
        s = smtplib.SMTP()    
        s.connect(mail_host)  #连接smtp服务器  
        s.login(mail_user,mail_pass)  #登陆服务器  
        s.sendmail(me, mailto_list, msg.as_string())  #发送邮件  
        s.close()    
        return True    
    except Exception as e:
        print str(e)    
        return False  
 
def IsOpen(ip,port,flag):
    s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)  
    try:  
        s.connect((ip,int(port)))  
        s.shutdown(2)  
        print ('%d is open'% port)  
        return True  
    except:  
        print ('%d is down' % port)    
        return False  
      
if __name__ == '__main__':  
    while(1>0):  
        flag=1  
        IsOpen('127.0.0.1',80,flag)  
        time.sleep(5)  
        flag=IsOpen('127.0.0.1',80,flag)  
        print (flag)  
        if flag==False:  
            send_mail(mailto_list,"VPN Server is down","error")  
            time.sleep(5)