如何通过python发送日历邮件（ics）

email的rfc:https://tools.ietf.org/html/rfc2446

方便起见，用代码说话（只是最简单的版本，各种定制需求可以参看rfc,不过很多效果需要客户端的支持，支持的比较好的是outlook）

# encoding: utf-8

import smtplib
from email.MIMEMultipart import MIMEMultipart
from email.MIMEBase import MIMEBase
from email.MIMEText import MIMEText
import os,datetime


def send_email(**kwargs):
    """
    method
    event
    dtstart
    due
    msg
    dtstamp
    """
    ical = """
    BEGIN:VCALENDAR\r\n
    PRODID:pyICSParser\r\n
    METHOD:%(method)s\r\n
    VERSION:2.0\r\n
    BEGIN:%(event)s\r\n
    DTSTART:%(dtstart)s\r\n
    DUE:%(due)s\r\n
    PRIORITY:1\r\n
    SUMMARY:%(msg)s\r\n
    UID:[e-mail]\r\n
    SEQUENCE:0\r\n
    DTSTAMP:%(dtstamp)s\r\n
    STATUS:%(status)s\r\n
    END:VEVENT\r\n
    END:VCALENDAR\r\n
    """% kwargs

    eml_body = u"%(msg)s" % kwargs
    msg = MIMEMultipart('mixed')
    msg['Date'] = formatdate(localtime=True)
    msg['Subject'] = u"%(msg)s" % kwargs
    msg['To'] = ",".join(attendees)

    part_email = MIMEText(eml_body,"html",'utf-8')
    part_cal = MIMEText(ical,'calendar;method=%(method)s'%kwargs,'utf-8')

    msgAlternative = MIMEMultipart('alternative')
    msg.attach(msgAlternative)

    ical_atch = MIMEBase('application/ics',' ;name="%s"'%("invite.ics"))
    ical_atch.set_payload(ical)
    Encoders.encode_base64(ical_atch)
    ical_atch.add_header('Content-Disposition', 'attachment; filename="%s"'%("invite.ics"))

    eml_atch = MIMEBase('text/plain','')
    Encoders.encode_base64(eml_atch)
    eml_atch.add_header('Content-Transfer-Encoding', "")

    msgAlternative.attach(part_email)
    msgAlternative.attach(part_cal)

    s = smtplib.SMTP()
    s.connect('xxxx')
    s.login(' ', ' ')
    s.sendmail('[e-mail]', attendees, msg.as_string())
    s.close()

attendees =['[e-mail]']
fro = ""

ddtstart = datetime.datetime.utcnow()
dur = datetime.timedelta(minutes= 5)
dtend = ddtstart + dur
dtend = dtend.strftime("%Y%m%dT%H%M%SZ")

send_email(method='PUBLISH',event='VTODO',dtstart=dtend,due=dtend,msg='publish 任务',dtstamp=dtend, status="COMPLETED")
send_email(method='REQUEST',event='VTODO',dtstart=dtend,due=dtend,msg='request 任务',dtstamp=dtend, status="NEEDS ACTION")
send_email(method='PUBLISH',event='VEVENT',dtstart=dtend,due=dtend,msg='publish 日历',dtstamp=dtend, status="CONFIRMED")
send_email(method='REQUEST',event='VEVENT',dtstart=dtend,due=dtend,msg='request 日历',dtstamp=dtend, status='CONFIRMED')