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# https://en.m.wikipedia.org/wiki/Electric_power

from __future__ import annotations

from typing import NamedTuple

class Result(NamedTuple):

name: str

value: float

def electric_power(voltage: float, current: float, power: float) -> tuple:

"""

This function can calculate any one of the three (voltage, current, power),

fundamental value of electrical system.

examples are below:

>>> electric_power(voltage=0, current=2, power=5)

Result(name='voltage', value=2.5)

>>> electric_power(voltage=2, current=2, power=0)

Result(name='power', value=4.0)

>>> electric_power(voltage=-2, current=3, power=0)

Result(name='power', value=6.0)

>>> electric_power(voltage=2, current=4, power=2)

Traceback (most recent call last):

...

ValueError: Exactly one argument must be 0

>>> electric_power(voltage=0, current=0, power=2)

Traceback (most recent call last):

...

ValueError: Exactly one argument must be 0

>>> electric_power(voltage=0, current=2, power=-4)

Traceback (most recent call last):

...

ValueError: Power cannot be negative in any electrical/electronics system

>>> electric_power(voltage=2.2, current=2.2, power=0)

Result(name='power', value=4.84)

>>> electric_power(current=0, power=6, voltage=2)

Result(name='current', value=3.0)

"""

if (voltage, current, power).count(0) != 1:

raise ValueError("Exactly one argument must be 0")

elif power < 0:

raise ValueError(

"Power cannot be negative in any electrical/electronics system"

)

elif voltage == 0:

return Result("voltage", power / current)

elif current == 0:

return Result("current", power / voltage)

elif power == 0:

return Result("power", float(round(abs(voltage * current), 2)))

else:

raise AssertionError

if __name__ == "__main__":

import doctest

doctest.testmod()

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