python 实现i 金融 interst 计算 课程设计

# https://www.investopedia.com from __future__ import annotations def simple_interest( principal: float, daily_interest_rate: float, days_between_payments: int ) -> float: """ >>> simple_interest(18000.0, 0.06, 3) 3240.0 >>> simple_interest(0.5, 0.06, 3) 0.09 >>> simple_interest(18000.0, 0.01, 10) 1800.0 >>> simple_interest(18000.0, 0.0, 3) 0.0 >>> simple_interest(5500.0, 0.01, 100) 5500.0 >>> simple_interest(10000.0, -0.06, 3) Traceback (most recent call last): ... ValueError: daily_interest_rate must be >= 0 >>> simple_interest(-10000.0, 0.06, 3) Traceback (most recent call last): ... ValueError: principal must be > 0 >>> simple_interest(5500.0, 0.01, -5) Traceback (most recent call last): ... ValueError: days_between_payments must be > 0 """ if days_between_payments <= 0: raise ValueError("days_between_payments must be > 0") if daily_interest_rate < 0: raise ValueError("daily_interest_rate must be >= 0") if principal <= 0: raise ValueError("principal must be > 0") return principal * daily_interest_rate * days_between_payments def compound_interest( principal: float, nominal_annual_interest_rate_percentage: float, number_of_compounding_periods: int, ) -> float: """ >>> compound_interest(10000.0, 0.05, 3) 1576.2500000000014 >>> compound_interest(10000.0, 0.05, 1) 500.00000000000045 >>> compound_interest(0.5, 0.05, 3) 0.07881250000000006 >>> compound_interest(10000.0, 0.06, -4) Traceback (most recent call last): ... ValueError: number_of_compounding_periods must be > 0 >>> compound_interest(10000.0, -3.5, 3.0) Traceback (most recent call last): ... ValueError: nominal_annual_interest_rate_percentage must be >= 0 >>> compound_interest(-5500.0, 0.01, 5) Traceback (most recent call last): ... ValueError: principal must be > 0 """ if number_of_compounding_periods <= 0: raise ValueError("number_of_compounding_periods must be > 0") if nominal_annual_interest_rate_percentage < 0: raise ValueError("nominal_annual_interest_rate_percentage must be >= 0") if principal <= 0: raise ValueError("principal must be > 0") return principal * ( (1 + nominal_annual_interest_rate_percentage) ** number_of_compounding_periods - 1 ) if __name__ == "__main__": import doctest doctest.testmod()