This comment prompted me to go look at the various spreadsheet software available, since I was only familiar with the usual Excel / GS / Libre. There is also GNOME's Gnumeric, KDE's Calligra, Apple's Numbers, an online variant of LibreOffice called Collabora, an Excel clone made by a German company called PlanMaker, a Latvian effort called OnlyOffice, and then probably the most unusual variant, but somehow it isn't surprising that somebody made a spreadsheet based on Python:

http://en.wikipedia.org/wiki/Pyspread