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Why? This is the type of thing I use Python for all the time. I'm much better at Python than I am at Excel and Python isn't even my main language.

Based on him being an iOS dev, it sounded to me like he made an entire iOS app just to calculate some values, not a small command line application.

I actually prefer writing little JS apps to do stuff like this to using Excel.

Which I don't even have on my personal computer now that I think about it.

Assuming his goal was to be ready with results of his calculations in real time while on a call, which may happen while you’re away from your computer, it makes sense I think. Excel is great, but on phone while away from your computer? Not so sure.