Not implemented. Compute the payment against loan principal.
rate : array_like
Rate of interest (per period)
per : array_like, int
Amount paid against the loan changes. The per is the period of interest.
nper : array_like
Number of compounding periods
pv : array_like
Present value
fv : array_like, optional
Future value
when : {{‘begin’, 1}, {‘end’, 0}}, {string, int}
When payments are due (‘begin’ (1) or ‘end’ (0))
See also
pmt, pv, ipmt
numpy.pmt
numpy.ipmt