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# Copyright (C) 2001-2006 Python Software Foundation# Author: Barry Warsaw# Contact: email-sig@python.org """Base class for MIME specializations.""" __all__ = ['MIMEBase'] from email import message  class MIMEBase(message.Message):    """Base class for MIME specializations."""     def __init__(self, _maintype, _subtype, **_params):        """This constructor adds a Content-Type: and a MIME-Version: header.         The Content-Type: header is taken from the _maintype and _subtype        arguments.  Additional parameters for this header are taken from the        keyword arguments.        """        message.Message.__init__(self)        ctype = '%s/%s' % (_maintype, _subtype)        self.add_header('Content-Type', ctype, **_params)        self['MIME-Version'] = '1.0'