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87 lines
3.1 KiB
Python
87 lines
3.1 KiB
Python
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"""
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A unit of time is any particular time interval, used as a standard way of measuring or
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expressing duration. The base unit of time in the International System of Units (SI),
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and by extension most of the Western world, is the second, defined as about 9 billion
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oscillations of the caesium atom.
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https://en.wikipedia.org/wiki/Unit_of_time
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"""
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time_chart: dict[str, float] = {
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"seconds": 1.0,
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"minutes": 60.0, # 1 minute = 60 sec
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"hours": 3600.0, # 1 hour = 60 minutes = 3600 seconds
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"days": 86400.0, # 1 day = 24 hours = 1440 min = 86400 sec
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"weeks": 604800.0, # 1 week=7d=168hr=10080min = 604800 sec
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"months": 2629800.0, # Approximate value for a month in seconds
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"years": 31557600.0, # Approximate value for a year in seconds
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}
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time_chart_inverse: dict[str, float] = {
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key: 1 / value for key, value in time_chart.items()
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}
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def convert_time(time_value: float, unit_from: str, unit_to: str) -> float:
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"""
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Convert time from one unit to another using the time_chart above.
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>>> convert_time(3600, "seconds", "hours")
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1.0
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>>> convert_time(3500, "Seconds", "Hours")
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0.972
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>>> convert_time(1, "DaYs", "hours")
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24.0
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>>> convert_time(120, "minutes", "SeCoNdS")
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7200.0
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>>> convert_time(2, "WEEKS", "days")
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14.0
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>>> convert_time(0.5, "hours", "MINUTES")
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30.0
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>>> convert_time(-3600, "seconds", "hours")
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Traceback (most recent call last):
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...
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ValueError: 'time_value' must be a non-negative number.
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>>> convert_time("Hello", "hours", "minutes")
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Traceback (most recent call last):
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...
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ValueError: 'time_value' must be a non-negative number.
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>>> convert_time([0, 1, 2], "weeks", "days")
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Traceback (most recent call last):
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...
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ValueError: 'time_value' must be a non-negative number.
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>>> convert_time(1, "cool", "century") # doctest: +ELLIPSIS
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Traceback (most recent call last):
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...
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ValueError: Invalid unit cool is not in seconds, minutes, hours, days, weeks, ...
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>>> convert_time(1, "seconds", "hot") # doctest: +ELLIPSIS
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Traceback (most recent call last):
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...
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ValueError: Invalid unit hot is not in seconds, minutes, hours, days, weeks, ...
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"""
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if not isinstance(time_value, (int, float)) or time_value < 0:
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msg = "'time_value' must be a non-negative number."
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raise ValueError(msg)
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unit_from = unit_from.lower()
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unit_to = unit_to.lower()
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if unit_from not in time_chart or unit_to not in time_chart:
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invalid_unit = unit_from if unit_from not in time_chart else unit_to
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msg = f"Invalid unit {invalid_unit} is not in {', '.join(time_chart)}."
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raise ValueError(msg)
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return round(
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time_value * time_chart[unit_from] * time_chart_inverse[unit_to],
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3,
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)
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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print(f"{convert_time(3600,'seconds', 'hours') = :,}")
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print(f"{convert_time(360, 'days', 'months') = :,}")
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print(f"{convert_time(360, 'months', 'years') = :,}")
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print(f"{convert_time(1, 'years', 'seconds') = :,}")
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