Hi Hamia, missed your post the other the day. Did you check out the Surface.IsCylinder() method? Looks like it should do the trick :)

I've previously used the Python modules xlrd and xlwt for reading/writing Excel files. That said I think I would also consider using the .NET methods available through IronPython. See this link: http://www.ironpython.info/index.php?title=Interacting_with_Excel

GhPython Workshop coming up this month. Tool developer Chris Mackey is teaching a live webinar titled - Making Your Own Python Components. More information and registration at https://attendee.gototraining.com/42b11/register/4476111114579892225