#!/usr/bin/env python
# vim:set fileencoding=utf8: #

from email.message import Message
from email.mime.message import MIMEMessage

msg = Message()
msg.set_payload("A string payload")

# This call to msg.attach() should generate a friendly exception
# indicating that it is illegal to attach after setting a string payload.
# At present, it fails with the following traceback:
# Traceback (most recent call last):
#   File "test_email_attach_to_string.py", line 19, in <module>
#     msg.attach(MIMEMessage(Message()))
#   File ".../Lib/email/message.py", line 196, in attach
#     self._payload.append(payload)
# AttributeError: 'str' object has no attribute 'append'
msg.attach(MIMEMessage(Message()))