def __init__(self, disposition=None):
self._disposition = None<EOL>if disposition is not None:<EOL><INDENT>self.disposition = disposition<EOL><DEDENT>
Create a Disposition object

        :param disposition: The content-disposition of the attachment,
                            specifying display style.
                            Specifies how you would like the attachment to be
                            displayed.
                            - "inline" results in the attached file being
                              displayed automatically within the message.
                            - "attachment" results in the attached file
                              requiring some action to display (e.g. opening
                              or downloading the file).
                            If unspecified, "attachment" is used. Must be one
                            of the two choices.
        :type disposition: string, optional