python 发送附件至邮箱

import smtplib
from email.MIMEText import MIMEText
from email.MIMEMultipart import MIMEMultipart
from email.MIMEBase import MIMEBase
from email import Encoders
import time

#send email
mail_body="邮件内容"
mail_from='发送的邮箱'
mail_to=['要发送的邮箱']
# 构造MIMEMultipart对象做为根容器
msg=MIMEMultipart()

# 构造MIMEText对象做为邮件显示内容并附加到根容器
body=MIMEText(mail_body)
msg.attach(body)

# 构造MIMEBase对象做为文件附件内容并附加到根容器
# 等同于如下3行
#contype = 'application/octet-stream'
#maintype, subtype = contype.split('/', 1)
#part = MIMEBase(maintype, subtype)
part = MIMEBase('application', 'octet-stream')

# 读入文件内容并格式化，此处文件为当前目录下，也可指定目录 例如：open(r'/tmp/123.txt','rb')
part.set_payload(open(file_name,'rb').read())
Encoders.encode_base64(part)
## 设置附件头
part.add_header('Content-Disposition', 'attachment; filename="'+file_name+'"')
msg.attach(part)

# 设置根容器属性
msg['Subject']=str(now.strftime("%Y%m%d")) + '数据'
msg['From']=mail_from
msg['To']=';'.join(mail_to)
msg['date']=time.strftime('%a, %d %b %Y %H:%M:%S %z')
#如上得到了格式化后的完整文本msg.as_string()
#用smtp发送邮件
smtp=smtplib.SMTP()

＃连接邮件服务商
smtp.connect('smtp.exmail.qq.com')

smtp.login('发送邮箱','发送邮箱密码')

smtp.sendmail(mail_from,mail_to,msg.as_string())
smtp.quit()
print 'ok'