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71 lines
1.7 KiB
Python
71 lines
1.7 KiB
Python
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"""
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Convert speed units
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https://en.wikipedia.org/wiki/Kilometres_per_hour
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https://en.wikipedia.org/wiki/Miles_per_hour
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https://en.wikipedia.org/wiki/Knot_(unit)
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https://en.wikipedia.org/wiki/Metre_per_second
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"""
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speed_chart: dict[str, float] = {
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"km/h": 1.0,
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"m/s": 3.6,
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"mph": 1.609344,
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"knot": 1.852,
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}
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speed_chart_inverse: dict[str, float] = {
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"km/h": 1.0,
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"m/s": 0.277777778,
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"mph": 0.621371192,
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"knot": 0.539956803,
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}
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def convert_speed(speed: float, unit_from: str, unit_to: str) -> float:
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"""
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Convert speed from one unit to another using the speed_chart above.
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"km/h": 1.0,
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"m/s": 3.6,
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"mph": 1.609344,
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"knot": 1.852,
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>>> convert_speed(100, "km/h", "m/s")
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27.778
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>>> convert_speed(100, "km/h", "mph")
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62.137
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>>> convert_speed(100, "km/h", "knot")
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53.996
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>>> convert_speed(100, "m/s", "km/h")
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360.0
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>>> convert_speed(100, "m/s", "mph")
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223.694
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>>> convert_speed(100, "m/s", "knot")
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194.384
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>>> convert_speed(100, "mph", "km/h")
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160.934
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>>> convert_speed(100, "mph", "m/s")
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44.704
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>>> convert_speed(100, "mph", "knot")
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86.898
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>>> convert_speed(100, "knot", "km/h")
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185.2
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>>> convert_speed(100, "knot", "m/s")
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51.444
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>>> convert_speed(100, "knot", "mph")
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115.078
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"""
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if unit_to not in speed_chart or unit_from not in speed_chart_inverse:
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raise ValueError(
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f"Incorrect 'from_type' or 'to_type' value: {unit_from!r}, {unit_to!r}\n"
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f"Valid values are: {', '.join(speed_chart_inverse)}"
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)
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return round(speed * speed_chart[unit_from] * speed_chart_inverse[unit_to], 3)
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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