通过Python发送电子邮件的程序带有"AttributeError: 'str' object has no attribute 'get_content_maintype"

Question

我有一个python代码，用来发送一封带有附件的电子邮件，我已经归结为：

#!/usr/bin/python
import os, re
import sys
import smtplib
#from email.mime.image import MIMEImage
from email.mime.multipart import MIMEMultipart
from email.MIMEText import MIMEText

SMTP_SERVER = 'smtp.gmail.com'
SMTP_PORT = 587
sender = '[e-mail]'
password = "e45dt4iamkiddingthisisnotmypassword"
recipient = '[e-mail]'
subject = 'Python emaillib Test'
message = 'Images attached.'
def main():
    msg = MIMEMultipart()
    msg['Subject'] = 'Python emaillib Test'
    msg['To'] = recipient
    msg['From'] = sender
    msg.attach('/tmp/images/a.gif')
    part = MIMEText('text', "plain")
    part.set_payload(message)
    msg.attach(part)
    session = smtplib.SMTP(SMTP_SERVER, SMTP_PORT)
    session.ehlo()
    session.starttls()
    session.ehlo
    session.login(sender, password)
#    my_message=msg.as_string()
    qwertyuiop=msg
    session.sendmail(sender, recipient, qwertyuiop.as_string())
    session.quit()
if __name__ == '__main__':
    main()

我在运行时遇到这个错误：

Traceback (most recent call last):
  File "./abcd.py", line 49, in <module>
    main()
  File "./abcd.py", line 44, in main
    session.sendmail(sender, recipient, qwertyuiop.as_string())
  File "/usr/lib/python2.7/email/message.py", line 137, in as_string
    g.flatten(self, unixfrom=unixfrom)
  File "/usr/lib/python2.7/email/generator.py", line 83, in flatten
    self._write(msg)
  File "/usr/lib/python2.7/email/generator.py", line 108, in _write
    self._dispatch(msg)
  File "/usr/lib/python2.7/email/generator.py", line 134, in _dispatch
    meth(msg)
  File "/usr/lib/python2.7/email/generator.py", line 203, in _handle_multipart
    g.flatten(part, unixfrom=False)
  File "/usr/lib/python2.7/email/generator.py", line 83, in flatten
    self._write(msg)
  File "/usr/lib/python2.7/email/generator.py", line 108, in _write
    self._dispatch(msg)
  File "/usr/lib/python2.7/email/generator.py", line 125, in _dispatch
    main = msg.get_content_maintype()
AttributeError: 'str' object has no attribute 'get_content_maintype'

我认为这与msg.attach（"/tmp/images/a.gif"）有关，但我不确定。问题的根源是qwertyuiop.as_string（）。

Answer 1

问题是msg.attach()附加了另一条消息，而不是字符串/文件名。您需要创建一个MIMEImage对象并附加它：

# instead of msg.attach('/tmp/images/a.gif')...
fp = open('/tmp/images/a.gif', 'rb')
msgImage = MIMEImage(fp.read())
fp.close()
msg.attach(msgImage)

示例改编自此处

如果您想要图像以外的类型，请签出http://docs.python.org/library/email.mime.html.

qwertyuiop.as_string()行出现错误的原因是，在调用as_string()之前，不会解析消息。