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# https://en.wikipedia.org/wiki/Ohm%27s_law

from typing import Dict

def ohms_law(voltage: float, current: float, resistance: float) -> Dict[str, float]:

"""

Apply Ohm's Law, on any two given electrical values, which can be voltage, current,

and resistance, and then in a Python dict return name/value pair of the zero value.

>>> ohms_law(voltage=10, resistance=5, current=0)

{'current': 2.0}

>>> ohms_law(voltage=0, current=0, resistance=10)

Traceback (most recent call last):

...

ValueError: One and only one argument must be 0

>>> ohms_law(voltage=0, current=1, resistance=-2)

Traceback (most recent call last):

...

ValueError: Resistance cannot be negative

>>> ohms_law(resistance=0, voltage=-10, current=1)

{'resistance': -10.0}

>>> ohms_law(voltage=0, current=-1.5, resistance=2)

{'voltage': -3.0}

"""

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

raise ValueError("One and only one argument must be 0")

if resistance < 0:

raise ValueError("Resistance cannot be negative")

if voltage == 0:

return {"voltage": float(current * resistance)}

elif current == 0:

return {"current": voltage / resistance}

elif resistance == 0:

return {"resistance": voltage / current}

else:

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

if __name__ == "__main__":

import doctest

doctest.testmod()

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