python2 smtp mail sender func

mail.py

#!/usr/bin/python
# -*- coding:utf-8 -*-

import smtplib
from email.MIMEMultipart import MIMEMultipart
from email.MIMEBase import MIMEBase
from email.MIMEText import MIMEText
from email import Encoders
from email import Utils
from email.header import Header
import os
import base64

smtp_server = "smtp.daum.net"
port = 465
userid = "USER ID FOR SMTP SERVER"
passwd = "USER PW FOR SMTP SERVER"

def send_mail(from_user, to_user, subject, text, attach):
        COMMASPACE = ", "
        msg = MIMEMultipart("alternative")
        msg["From"] = from_user
        msg["To"] = to_user
        msg["Subject"] = Header(s=subject, charset="utf-8")
        msg["Date"] = Utils.formatdate(localtime = 1)
        msg.attach(MIMEText(text, "html", _charset="utf-8"))

        if (attach != None):
                part = MIMEBase("application", "octet-stream")
                part.set_payload(open(attach, "rb").read())
                Encoders.encode_base64(part)
                part.add_header("Content-Disposition", "attachment; filename=\"%s\"" % os.path.basename(attach))
                msg.attach(part)

        smtp = smtplib.SMTP_SSL(smtp_server, port)
        smtp.ehlo()
        smtp.login(userid, passwd)
        smtp.sendmail(from_user, to_user, msg.as_string())
        smtp.close()

# Example
send_mail('juice500ml@hanmail.net', 'juice500ml@gmail.com', "Test Subject 테스트 입력 ", "Test text 테스트 입력 ", "/home/juice500/Desktop/gen.py")