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105 lines
2.9 KiB
Python
105 lines
2.9 KiB
Python
"""
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Conversion of length units.
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Available Units:
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Metre, Kilometre, Megametre, Gigametre,
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Terametre, Petametre, Exametre, Zettametre, Yottametre
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USAGE :
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-> Import this file into their respective project.
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-> Use the function length_conversion() for conversion of length units.
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-> Parameters :
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-> value : The number of from units you want to convert
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-> from_type : From which type you want to convert
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-> to_type : To which type you want to convert
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REFERENCES :
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-> Wikipedia reference: https://en.wikipedia.org/wiki/Meter
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-> Wikipedia reference: https://en.wikipedia.org/wiki/Kilometer
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-> Wikipedia reference: https://en.wikipedia.org/wiki/Orders_of_magnitude_(length)
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"""
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UNIT_SYMBOL = {
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"meter": "m",
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"kilometer": "km",
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"megametre": "Mm",
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"gigametre": "Gm",
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"terametre": "Tm",
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"petametre": "Pm",
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"exametre": "Em",
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"zettametre": "Zm",
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"yottametre": "Ym",
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}
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# Exponent of the factor(meter)
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METRIC_CONVERSION = {
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"m": 0,
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"km": 3,
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"Mm": 6,
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"Gm": 9,
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"Tm": 12,
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"Pm": 15,
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"Em": 18,
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"Zm": 21,
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"Ym": 24,
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}
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def length_conversion(value: float, from_type: str, to_type: str) -> float:
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"""
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Conversion between astronomical length units.
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>>> length_conversion(1, "meter", "kilometer")
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0.001
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>>> length_conversion(1, "meter", "megametre")
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1e-06
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>>> length_conversion(1, "gigametre", "meter")
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1000000000
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>>> length_conversion(1, "gigametre", "terametre")
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0.001
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>>> length_conversion(1, "petametre", "terametre")
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1000
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>>> length_conversion(1, "petametre", "exametre")
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0.001
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>>> length_conversion(1, "terametre", "zettametre")
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1e-09
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>>> length_conversion(1, "yottametre", "zettametre")
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1000
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>>> length_conversion(4, "wrongUnit", "inch")
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Traceback (most recent call last):
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...
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ValueError: Invalid 'from_type' value: 'wrongUnit'.
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Conversion abbreviations are: m, km, Mm, Gm, Tm, Pm, Em, Zm, Ym
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"""
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from_sanitized = from_type.lower().strip("s")
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to_sanitized = to_type.lower().strip("s")
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from_sanitized = UNIT_SYMBOL.get(from_sanitized, from_sanitized)
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to_sanitized = UNIT_SYMBOL.get(to_sanitized, to_sanitized)
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if from_sanitized not in METRIC_CONVERSION:
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raise ValueError(
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f"Invalid 'from_type' value: {from_type!r}.\n"
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f"Conversion abbreviations are: {', '.join(METRIC_CONVERSION)}"
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)
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if to_sanitized not in METRIC_CONVERSION:
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raise ValueError(
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f"Invalid 'to_type' value: {to_type!r}.\n"
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f"Conversion abbreviations are: {', '.join(METRIC_CONVERSION)}"
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)
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from_exponent = METRIC_CONVERSION[from_sanitized]
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to_exponent = METRIC_CONVERSION[to_sanitized]
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exponent = 1
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if from_exponent > to_exponent:
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exponent = from_exponent - to_exponent
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else:
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exponent = -(to_exponent - from_exponent)
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return value * pow(10, exponent)
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if __name__ == "__main__":
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from doctest import testmod
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testmod()
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