send email with attachments in Python

sendemail.py

'''
email send service library. Using SMTP.

author: yaowei
last modify: 2012-07-30

'''
import datetime
import logging
import os
import smtplib

from email.mime.text import MIMEText
from email import encoders
from email.message import Message
from email.mime.audio import MIMEAudio
from email.mime.base import MIMEBase
from email.mime.image import MIMEImage
from email.mime.multipart import MIMEMultipart
from email.header import Header

import mimetypes

def _get_attach_msg(path):
    ''' make MIME type attachment message '''
    if not os.path.isfile(path):
        return
    # Guess the content type based on the file's extension.  Encoding
    # will be ignored, although we should check for simple things like
    # gzip'd or compressed files.
    ctype, encoding = mimetypes.guess_type(path)
    if ctype is None or encoding is not None:
        # No guess could be made, or the file is encoded (compressed), so
        # use a generic bag-of-bits type.
        ctype = 'application/octet-stream'
    maintype, subtype = ctype.split('/', 1)
    if maintype == 'text':
        fp = open(path)
        # Note: we should handle calculating the charset
        msg = MIMEText(fp.read(), _subtype=subtype)
        fp.close()
    elif maintype == 'image':
        fp = open(path, 'rb')
        msg = MIMEImage(fp.read(), _subtype=subtype)
        fp.close()
    elif maintype == 'audio':
        fp = open(path, 'rb')
        msg = MIMEAudio(fp.read(), _subtype=subtype)
        fp.close()
    else:
        fp = open(path, 'rb')
        msg = MIMEBase(maintype, subtype)
        msg.set_payload(fp.read())
        fp.close()
        # Encode the payload using Base64
        encoders.encode_base64(msg)
    # Set the filename parameter
    msg.add_header('Content-Disposition', 'attachment', filename=path.split('/')[-1])
    return msg

def _make_mime(mail_from, mail_to, subject, body, attachments):
    '''create MIME'''
    msg = MIMEMultipart()
    msg['From'] = Header(mail_from, 'ascii')
    msg['To'] = Header(mail_to,  'ascii')
    msg['Subject'] = Header(subject, 'ascii')
    msg.preamble = 'You will not see this in a MIME-aware mail reader.\n'
    msg.attach( MIMEText(body,'plain')) 
    for filepath in attachments:
        msg.attach(_get_attach_msg(filepath))
    return msg


def send_email(sender,receivers, subject, content, attachments, smtp_host, smtp_user, smtp_passwd):
    '''
    Send email using smtp server and auth 
    param:
    sender: email sender address
    receiver: email receiver addresses list, eg. ['alice@example.com']
    subject: email title string
    content: email content string

    smtp_host: smtp host address
    smtp_user: smtp user name
    smtp_passwd: smtp password
    '''
    try:
        client = smtplib.SMTP(smtp_host)
        client.set_debuglevel(1)
        client.login(smtp_user, smtp_passwd)
        client.sendmail(sender, receivers, _make_mime(sender,','.join( receivers ), subject, content, attachments).as_string())
        client.close()
        logging.debug("Successfully sent email")
    except smtplib.SMTPException:
        logging.warning("Error: unable to send email")