For Python there's also PyExcelerate for creating XLSX files: https://github.com/kz26/PyExcelerate https://github.com/kz26/PyExcelerate Supposedly it's the fas

For Python there's also PyExcelerate for creating XLSX files: https://github.com/kz26/PyExcelerate https://github.com/kz26/PyExcelerate Supposedly it's the fastest, even beating out xlsxwriter.