numpy.npv(rate, values)
[source]
Returns the NPV (Net Present Value) of a cash flow series.
Parameters: 


Returns: 

Returns the result of: [G]
[G]  L. J. Gitman, “Principles of Managerial Finance, Brief,” 3rd ed., AddisonWesley, 2003, pg. 346. 
>>> np.npv(0.281,[100, 39, 59, 55, 20]) 0.0084785916384548798 # may vary
(Compare with the Example given for numpy.lib.financial.irr)
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https://docs.scipy.org/doc/numpy1.17.0/reference/generated/numpy.npv.html