我们平时需要使用 Python 发送各类邮件，这个需求怎么来实现？答案其实很简单，smtplib 和 email库可以帮忙实现这个需求。smtplib 和 email 的组合可以用来发送各类邮件：普通文本，HTML 形式，带附件，群发邮件，带图片的邮件等等。我们这里将会分几节把发送邮件功能解释完成。
smtplib 是 Python 用来发送邮件的模块，email 是用来处理邮件消息。
发送邮件系列最后一篇将会介绍发送混合邮件：里面包含附件，HTML 形式，不同文本:
import smtplib
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
sender = '***'
receiver = '***'
subject = 'python email test'
smtpserver = 'smtp.163.com'
username = '***'
password = '***'
# Create message container - the correct MIME type is multipart/alternative.
msg = MIMEMultipart('mixed')
msg['Subject'] = "Link"
# Create the body of the message (a plain-text and an HTML version).
text = "Hi!\nHow are you?\nHere is the link you wanted:\nhttp://www.python.org"
html = """\
Hi!
How are you?
Here is the link you wanted.
"""
# Record the MIME types of both parts - text/plain and text/html.
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)
# 构造附件
att = MIMEText(open('/Users/1.jpg', 'rb').read(), 'base64', 'utf-8')
att["Content-Type"] = 'application/octet-stream'
att["Content-Disposition"] = 'attachment; filename="1.jpg"'
msg.attach(att)
smtp = smtplib.SMTP()
smtp.connect(smtpserver)
smtp.login(username, password)
smtp.sendmail(sender, receiver, msg.as_string())
smtp.quit()
注意：这里的代码并没有把异常处理加入，需要读者自己处理异常。