NumPy : Beginner's Guide - Third Edition

Time for action – calculating the net present value

We will calculate the net present value for a random generated cash flow series:

1. Generate five random values for the cash flow series. Insert -100 as the start value:

   cashflows = np.random.randint(100, size=5)
   cashflows = np.insert(cashflows, 0, -100)
   print("Cashflows", cashflows)

   The cash flows would be as follows:

   Cashflows [-100   38   48   90   17   36]
   

2. Call the npv() function to calculate the net present value from the cash flow series we generated in the previous step. Use a rate of 3 percent:

   print("Net present value", np.npv(0.03, cashflows))

   The net present value:

   Net present value 107.435682443
   

What just happened?

We computed the net present value from a random generated cash flow series with the ...