iframe-proxy | Sunbelt Computer Software

28 lines (22 loc) · 574 Bytes

from __future__ import annotations

def mean(nums: list) -> float:

"""

Find mean of a list of numbers.

Wiki: https://en.wikipedia.org/wiki/Mean

>>> mean([3, 6, 9, 12, 15, 18, 21])

12.0

>>> mean([5, 10, 15, 20, 25, 30, 35])

20.0

>>> mean([1, 2, 3, 4, 5, 6, 7, 8])

4.5

>>> mean([])

Traceback (most recent call last):

...

ValueError: List is empty

"""

if not nums:

raise ValueError("List is empty")

return sum(nums) / len(nums)

if __name__ == "__main__":

import doctest

doctest.testmod()

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