mirror of https://github.com/home-assistant/core
31 lines
1.1 KiB
Python
31 lines
1.1 KiB
Python
"""Temperature util functions."""
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from homeassistant.const import (
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TEMP_CELSIUS, TEMP_FAHRENHEIT, UNIT_NOT_RECOGNIZED_TEMPLATE, TEMPERATURE)
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def fahrenheit_to_celsius(fahrenheit: float) -> float:
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"""Convert a temperature in Fahrenheit to Celsius."""
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return (fahrenheit - 32.0) / 1.8
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def celsius_to_fahrenheit(celsius: float) -> float:
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"""Convert a temperature in Celsius to Fahrenheit."""
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return celsius * 1.8 + 32.0
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def convert(temperature: 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 (TEMP_CELSIUS, TEMP_FAHRENHEIT):
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raise ValueError(UNIT_NOT_RECOGNIZED_TEMPLATE.format(
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from_unit, TEMPERATURE))
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if to_unit not in (TEMP_CELSIUS, TEMP_FAHRENHEIT):
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raise ValueError(UNIT_NOT_RECOGNIZED_TEMPLATE.format(
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to_unit, TEMPERATURE))
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if from_unit == to_unit:
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return temperature
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elif from_unit == TEMP_CELSIUS:
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return celsius_to_fahrenheit(temperature)
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else:
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return fahrenheit_to_celsius(temperature)
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