shows some money

I want to write an open source business calculator library in Python. There doesn't seem to be a single library that does this. Thoughts?

maybe the API looks like this:

Or maybe that's an Annuity, and we should have Perpetuities and things like that...

@AaronHall Seen github.com/numpy/numpy/blob/master/numpy/lib/financial.py ?

@ChrisW.Rea thanks, didn't know that existed yet. I want this to be no dependencies, but delegate to numpy where it makes sense if it's there, so that's pretty helpful.