converting celsius, fahrenheit, and kelvin

temps.py

import argparse


def c2f(val: float) -> float:
    return val * 1.8 + 32


def f2c(val: float) -> float:
    return (val - 32) / 1.8


def f2k(val: float) -> float:
    return (val + 459.67) / 1.8


def k2f(val: float) -> float:
    return val * 1.8 - 459.67


def c2k(val: float) -> float:
    return val + 273.15


def k2c(val: float) -> float:
    return val - 273.15


def build_parser():
    parser = argparse.ArgumentParser()
    parser.add_argument("scale", help='Source Scale (Celcius: c, Fahrenheit: f, Kelvin: k')
    parser.add_argument("temperature", help='Known Temperature')

    return parser.parse_args()


if __name__ == "__main__":
    args = build_parser()
    temperature = float(args.temperature)
    if args.scale == 'c':
        f, k = c2f(temperature), c2k(temperature)
        print(f'{temperature} C = {f} F and {k} K')
    elif args.scale == 'f':
        c, k = f2c(temperature), f2k(temperature)
        print(f'{temperature} F = {c} C and {k} K')
    elif args.scale == 'k':
        c, f = k2c(temperature), k2f(temperature)
        print(f'{temperature} K = {c} C and {f} F')
    else:
        print("Scale should be c, f, or k")