python3 sends an instance of any file mail

Examples are as follows:

#!/usr/bin/python
# -*- coding: UTF-8 -*-
import smtplib
import email.mime.multipart
import email.mime.text
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from email.mime.application import MIMEApplication

def send_email(smtpHost, sendAddr, password, recipientAddrs, subject='', content=''):
 msg = email.mime.multipart.MIMEMultipart()
 msg['from'] = sendAddr
 msg['to'] = recipientAddrs
 msg['subject'] = subject
 content = content
 txt = email.mime.text.MIMEText(content, 'plain', 'utf-8')
 msg.attach(txt)


 #  Add attachments, send D:/mydev/yasuo.rar file 
 part = MIMEApplication(open('D:/mydev/6.rar','rb').read())
 part.add_header('Content-Disposition', 'attachment', filename="yasuo.rar")
 msg.attach(part)

 smtp = smtplib.SMTP()
 smtp.connect(smtpHost, '25')
 smtp.login(sendAddr, password)
 smtp.sendmail(sendAddr, recipientAddrs, str(msg))
 print(" Send successfully! ")
 smtp.quit()

try:

subject = 'Python  Test email '
content = ' This is a 1 Letters from  Python  Written test mail. '
send_email('smtp.163.com', '18310161797@163.com', ' Your password ', '526189064@qq.com', subject, content)
except Exception as err:
print(err)