message.py 文件源码

def _create_attachment(self, filename, content, mimetype=None):
        """
        Converts the filename, content, mimetype triple into a MIME attachment
        object.
        """
        if mimetype is None:
            mimetype, _ = mimetypes.guess_type(filename)
            if mimetype is None:
                mimetype = DEFAULT_ATTACHMENT_MIME_TYPE
        attachment = self._create_mime_attachment(content, mimetype)
        if filename:
            try:
                filename.encode('ascii')
            except UnicodeEncodeError:
                if six.PY2:
                    filename = filename.encode('utf-8')
                filename = ('utf-8', '', filename)
            attachment.add_header('Content-Disposition', 'attachment',
                                  filename=filename)
        return attachment