ind_reactance.py

# https://en.wikipedia.org/wiki/Electrical_reactance#Inductive_reactance
from __future__ importannotations

frommathimportpi


defind_reactance(
inductance: float, frequency: float, reactance: float
) ->dict[str, float]:
"""
 Calculate inductive reactance, frequency or inductance from two given electrical
 properties then return name/value pair of the zero value in a Python dict.

 Parameters
 ----------
 inductance : float with units in Henries

 frequency : float with units in Hertz

 reactance : float with units in Ohms

 >>> ind_reactance(-35e-6, 1e3, 0)
 Traceback (most recent call last):
 ...
 ValueError: Inductance cannot be negative

 >>> ind_reactance(35e-6, -1e3, 0)
 Traceback (most recent call last):
 ...
 ValueError: Frequency cannot be negative

 >>> ind_reactance(35e-6, 0, -1)
 Traceback (most recent call last):
 ...
 ValueError: Inductive reactance cannot be negative

 >>> ind_reactance(0, 10e3, 50)
 {'inductance': 0.0007957747154594767}

 >>> ind_reactance(35e-3, 0, 50)
 {'frequency': 227.36420441699332}

 >>> ind_reactance(35e-6, 1e3, 0)
 {'reactance': 0.2199114857512855}

 """

if (inductance, frequency, reactance).count(0) !=1:
raiseValueError("One and only one argument must be 0")
ifinductance<0:
raiseValueError("Inductance cannot be negative")
iffrequency<0:
raiseValueError("Frequency cannot be negative")
ifreactance<0:
raiseValueError("Inductive reactance cannot be negative")
ifinductance==0:
return {"inductance": reactance/ (2*pi*frequency)}
eliffrequency==0:
return {"frequency": reactance/ (2*pi*inductance)}
elifreactance==0:
return {"reactance": 2*pi*frequency*inductance}
else:
raiseValueError("Exactly one argument must be 0")


if__name__=="__main__":
importdoctest

doctest.testmod()