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# Copyright (C) 2002-2004 Python Software Foundation
# Author: Barry Warsaw
# Contact: email-sig@python.org

"""Base class for MIME type messages that are not multipart."""

from email import Errors
from email import MIMEBase



class MIMENonMultipart(MIMEBase.MIMEBase):
    """Base class for MIME multipart/* type messages."""

    __pychecker__ = 'unusednames=payload'

    def attach(self, payload):
        # The public API prohibits attaching multiple subparts to MIMEBase
        # derived subtypes since none of them are, by definition, of content
        # type multipart/*
        raise Errors.MultipartConversionError(
            'Cannot attach additional subparts to non-multipart/*')

    del __pychecker__