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* Pyupgrade to Python 3.9
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43 lines
1.4 KiB
Python
43 lines
1.4 KiB
Python
# https://en.wikipedia.org/wiki/Ohm%27s_law
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from __future__ import annotations
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def ohms_law(voltage: float, current: float, resistance: float) -> dict[str, float]:
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"""
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Apply Ohm's Law, on any two given electrical values, which can be voltage, current,
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and resistance, and then in a Python dict return name/value pair of the zero value.
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>>> ohms_law(voltage=10, resistance=5, current=0)
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{'current': 2.0}
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>>> ohms_law(voltage=0, current=0, resistance=10)
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Traceback (most recent call last):
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...
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ValueError: One and only one argument must be 0
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>>> ohms_law(voltage=0, current=1, resistance=-2)
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Traceback (most recent call last):
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...
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ValueError: Resistance cannot be negative
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>>> ohms_law(resistance=0, voltage=-10, current=1)
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{'resistance': -10.0}
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>>> ohms_law(voltage=0, current=-1.5, resistance=2)
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{'voltage': -3.0}
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"""
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if (voltage, current, resistance).count(0) != 1:
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raise ValueError("One and only one argument must be 0")
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if resistance < 0:
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raise ValueError("Resistance cannot be negative")
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if voltage == 0:
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return {"voltage": float(current * resistance)}
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elif current == 0:
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return {"current": voltage / resistance}
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elif resistance == 0:
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return {"resistance": voltage / current}
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else:
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raise ValueError("Exactly one argument must be 0")
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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