not out of the box, but they do exist
XlsxWriter 0.8.5 : Python Package Index
openpyxl - A Python library to read/write Excel 2010 xlsx/xlsm files — openpyxl 2.3.5 documentation
plus there are a couple of branches on github
Okay, we're starting to circle (see my previous example). Meeting adjourned.
I try to avoid .xlsx for data unless I really need functionality like big worksheets. If your datasets are that big, you probably should be using a database anyway!
grief... great minds think ... then there are the rest of us, time to change the bifocals
Data Interoperability extension will write XLSX.
Of course it has a cost.