How to send email with pdf attachment in Python? [duplicate]

Possible Duplicate:
How to send Email Attachments with python

I would like to edit the following code and send an email with an attachment. Attachment is a pdf file, it is under /home/myuser/sample.pdf, in linux environment. What should I change below?

import smtplib  
fromaddr = 'myemail@gmail.com'  
toaddrs  = 'youremail@gmail.com'  
msg = 'Hello'  


# Credentials (if needed)  
username = 'myemail'  
password = 'yyyyyy'  

# The actual mail send  
server = smtplib.SMTP('smtp.gmail.com:587')  
server.starttls()  
server.login(username,password)  
server.sendmail(fromaddr, toaddrs, msg)  
server.quit()