Include html part in a mail with python libgmail

I've a question about its usage: i need to send an html formatted mail. I prepare my message with

ga = libgmail.GmailAccount(USERNAME,PASSWORD)
msg = MIMEMultipart('alternative') 
msg.attach(part1)
msg.attach(part2)
...
ga.sendMessage(msg.as_string())

This way doesn't works, it seems can't send msg with sendMessage method. What is the right way? : D

From stackoverflow

• If you refer to libgmail from sourceforge, you need to compose your messages with the email module.

  Generate the HTML message as a MIME document, and include it as a part of a multipart MIME message. When you have a fully constructed multipart MIME, pass it along as a string to the libgmail constructor, using to .as_string() method.

  An example in the doc contains the code for a similar requirement:

  # Create message container - the correct MIME type is multipart/alternative.
  msg = MIMEMultipart('alternative')
  msg['Subject'] = "Link"
  msg['From'] = me
  msg['To'] = you
  ...
  # Record the MIME types of both parts - text/plain and text/html.
  # ... text and html are strings with appropriate content.
  part1 = MIMEText(text, 'plain')
  part2 = MIMEText(html, 'html')
  
  # Attach parts into message container.
  # According to RFC 2046, the last part of a multipart message, in this case
  # the HTML message, is best and preferred.
  msg.attach(part1)
  msg.attach(part2)
  

  Emilio : thanks for the explanation. Now i have the msg object, but i don't know how pass it to libgmail methods to send mail, like libgmail.GmailAccount(USERNAME,PASSWORD) ga.sendMessage(msg.as_string()) doesn't works :/

  gimel : try to create a "GmailComposedMessage" from the string, and then try to send this object.

  Emilio : I don't understand how :/