financial.interest

Functions

apr_interest(→ float)
compound_interest(→ float)
simple_interest(→ float)

Module Contents

financial.interest.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

financial.interest.compound_interest(principal: float, nominal_annual_interest_rate_percentage: float, number_of_compounding_periods: float) → 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

financial.interest.simple_interest(principal: float, daily_interest_rate: float, days_between_payments: float) → 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