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* Pyupgrade to Python 3.9
* updating DIRECTORY.md
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29 lines
574 B
Python
29 lines
574 B
Python
from __future__ import annotations
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def mean(nums: list) -> float:
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"""
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Find mean of a list of numbers.
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Wiki: https://en.wikipedia.org/wiki/Mean
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>>> mean([3, 6, 9, 12, 15, 18, 21])
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12.0
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>>> mean([5, 10, 15, 20, 25, 30, 35])
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20.0
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>>> mean([1, 2, 3, 4, 5, 6, 7, 8])
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4.5
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>>> mean([])
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Traceback (most recent call last):
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...
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ValueError: List is empty
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"""
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if not nums:
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raise ValueError("List is empty")
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return sum(nums) / len(nums)
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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