py.py

class XLSRenderer(renderers.BaseRenderer):

    # https://blogs.msdn.microsoft.com/vsofficedeveloper/2008/05/08/office-2007-file-format-mime-types-for-http-content-streaming-2/
    media_type = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'
    format = 'xlsx'
    charset = None
    render_style = 'binary'

    def render(self, data, accepted_media_type=None, renderer_context=None):

        logger.info(f'XLSRenderer svn data: {data["svns"]}')
                    
                    
        expose_transcripts = data['organization'].features.expose_transcripts

        wb = SVNWorkbookGenerator(
            data['svns'],
            expose_transcripts=expose_transcripts
        ).generate()

        # excel files are some kind of zipped xml data
        logger.info("saving workbook")
        return wb