For those who don't see Python. This is strange, but I have found where Python Preview group is hiding. Go to File -> Options ->Customize Ribbon -> In Choose commands from drop-down select Main Tabs -> Expand Formulas -> Select Python (Preview) -> Press Add button (between panels). And under strange I mean that... this gives nothing. When you go to Formulas tab and press lower button of Insert Python button (with little dropdown), you must see two menus: Custom Python Formula and Explore Python Samples. However, you see another menus: Python in Excel and Try Python sample (sic! - note "Samples" with capital "S" in the first case and "sample" with lower case "s" in the second case). In other words, there's no way to insert Python code.