Financial functions
Simple financial functions
| fv(rate, nper, pmt, pv[, when]) | Compute the future value. | 
| pv(rate, nper, pmt[, fv, when]) | Compute the present value. | 
| npv(rate, values) | Returns the NPV (Net Present Value) of a cash flow series. | 
| pmt(rate, nper, pv[, fv, when]) | Compute the payment against loan principal plus interest. | 
| ppmt(rate, per, nper, pv[, fv, when]) | Compute the payment against loan principal. | 
| ipmt(rate, per, nper, pv[, fv, when]) | Compute the interest portion of a payment. | 
| irr(values) | Return the Internal Rate of Return (IRR). | 
| mirr(values, finance_rate, reinvest_rate) | Modified internal rate of return. | 
| nper(rate, pmt, pv[, fv, when]) | Compute the number of periodic payments. | 
| rate(nper, pmt, pv, fv[, when, guess, tol, …]) | Compute the rate of interest per period. | 
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    https://docs.scipy.org/doc/numpy-1.16.1/reference/routines.financial.html