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financial/present_value.py
42 строки
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Christian Clauss
Fix docstring in present_value.py (#8702)
01 май 2023, 03:59
Не верифицирован
01 май 2023, 03:59
f6df26b
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""" Reference: https://www.investopedia.com/terms/p/presentvalue.asp An algorithm that calculates the present value of a stream of yearly cash flows given... 1. The discount rate (as a decimal, not a percent) 2. An array of cash flows, with the index of the cash flow being the associated year Note: This algorithm assumes that cash flows are paid at the end of the specified year """ def present_value(discount_rate: float, cash_flows: list[float]) -> float: """ >>> present_value(0.13, [10, 20.70, -293, 297]) 4.69 >>> present_value(0.07, [-109129.39, 30923.23, 15098.93, 29734,39]) -42739.63 >>> present_value(0.07, [109129.39, 30923.23, 15098.93, 29734,39]) 175519.15 >>> present_value(-1, [109129.39, 30923.23, 15098.93, 29734,39]) Traceback (most recent call last): ... ValueError: Discount rate cannot be negative >>> present_value(0.03, []) Traceback (most recent call last): ... ValueError: Cash flows list cannot be empty """ if discount_rate < 0: raise ValueError("Discount rate cannot be negative") if not cash_flows: raise ValueError("Cash flows list cannot be empty") present_value = sum( cash_flow / ((1 + discount_rate) ** i) for i, cash_flow in enumerate(cash_flows) ) return round(present_value, ndigits=2) if __name__ == "__main__": import doctest doctest.testmod()