mirror of
https://github.com/home-assistant/core
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221d5205e4
* Upgrade mypy to 0.770, related cleanups https://mypy-lang.blogspot.com/2020/03/mypy-0770-released.html * Clean up config and make it a notch stricter, address findings
50 lines
1.4 KiB
Python
50 lines
1.4 KiB
Python
"""Volume conversion util functions."""
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import logging
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from numbers import Number
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from homeassistant.const import (
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UNIT_NOT_RECOGNIZED_TEMPLATE,
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VOLUME,
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VOLUME_FLUID_OUNCE,
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VOLUME_GALLONS,
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VOLUME_LITERS,
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VOLUME_MILLILITERS,
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)
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_LOGGER = logging.getLogger(__name__)
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VALID_UNITS = [VOLUME_LITERS, VOLUME_MILLILITERS, VOLUME_GALLONS, VOLUME_FLUID_OUNCE]
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def __liter_to_gallon(liter: float) -> float:
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"""Convert a volume measurement in Liter to Gallon."""
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return liter * 0.2642
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def __gallon_to_liter(gallon: float) -> float:
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"""Convert a volume measurement in Gallon to Liter."""
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return gallon * 3.785
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def convert(volume: float, from_unit: str, to_unit: str) -> float:
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"""Convert a temperature from one unit to another."""
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if from_unit not in VALID_UNITS:
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raise ValueError(UNIT_NOT_RECOGNIZED_TEMPLATE.format(from_unit, VOLUME))
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if to_unit not in VALID_UNITS:
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raise ValueError(UNIT_NOT_RECOGNIZED_TEMPLATE.format(to_unit, VOLUME))
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if not isinstance(volume, Number):
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raise TypeError(f"{volume} is not of numeric type")
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if from_unit == to_unit:
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return volume
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result: float = volume
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if from_unit == VOLUME_LITERS and to_unit == VOLUME_GALLONS:
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result = __liter_to_gallon(volume)
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elif from_unit == VOLUME_GALLONS and to_unit == VOLUME_LITERS:
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result = __gallon_to_liter(volume)
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return result
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