def __init__(self, message, attrs):
        """
        @param message: An L{IMessagePart} provider which this structure object
            reports on.

        @param attrs: A C{dict} giving the parameters of the I{Content-Type}
            header of the message.
        """
        self.message = message
        self.attrs = attrs

        @param message: An L{IMessagePart} provider which this structure object
            reports on.

        @param attrs: A C{dict} giving the parameters of the I{Content-Type}
            header of the message.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/mail/imap4.py