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1# Copyright (C) 2002-2006 Python Software Foundation
2# Author: Barry Warsaw
3# Contact: email-sig@python.org
4
5"""Base class for MIME type messages that are not multipart."""
6
7__all__ = ['MIMENonMultipart']
8
9from email import errors
10from email.mime.base import MIMEBase
11
12
13
14class MIMENonMultipart(MIMEBase):
15    """Base class for MIME non-multipart type messages."""
16
17    def attach(self, payload):
18        # The public API prohibits attaching multiple subparts to MIMEBase
19        # derived subtypes since none of them are, by definition, of content
20        # type multipart/*
21        raise errors.MultipartConversionError(
22            'Cannot attach additional subparts to non-multipart/*')
23