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Added apr_interest function to financial (#6025)

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* Added apr_interest function to financial

* Update interest.py

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Update financial/interest.py

* float

---------

Co-authored-by: Christian Clauss <cclauss@me.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
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Turro 2023-06-19 06:46:29 -05:00 committed by GitHub
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commit ea6c6056cf
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1 changed files with 39 additions and 2 deletions
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41
financial/interest.py
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@ -4,7 +4,7 @@ from __future__ import annotations
def simple_interest(
principal: float, daily_interest_rate: float, days_between_payments: int
principal: float, daily_interest_rate: float, days_between_payments: float
) -> float:
"""
>>> simple_interest(18000.0, 0.06, 3)
@ -42,7 +42,7 @@ def simple_interest(
def compound_interest(
principal: float,
nominal_annual_interest_rate_percentage: float,
number_of_compounding_periods: int,
number_of_compounding_periods: float,
) -> float:
"""
>>> compound_interest(10000.0, 0.05, 3)
@ -77,6 +77,43 @@ def compound_interest(
)
def apr_interest(
principal: float,
nominal_annual_percentage_rate: float,
number_of_years: float,
) -> float:
"""
>>> apr_interest(10000.0, 0.05, 3)
1618.223072263547
>>> apr_interest(10000.0, 0.05, 1)
512.6749646744732
>>> apr_interest(0.5, 0.05, 3)
0.08091115361317736
>>> apr_interest(10000.0, 0.06, -4)
Traceback (most recent call last):
...
ValueError: number_of_years must be > 0
>>> apr_interest(10000.0, -3.5, 3.0)
Traceback (most recent call last):
...
ValueError: nominal_annual_percentage_rate must be >= 0
>>> apr_interest(-5500.0, 0.01, 5)
Traceback (most recent call last):
...
ValueError: principal must be > 0
"""
if number_of_years <= 0:
raise ValueError("number_of_years must be > 0")
if nominal_annual_percentage_rate < 0:
raise ValueError("nominal_annual_percentage_rate must be >= 0")
if principal <= 0:
raise ValueError("principal must be > 0")
return compound_interest(
principal, nominal_annual_percentage_rate / 365, number_of_years * 365
)
if __name__ == "__main__":
import doctest