Python/maths/average_mean.py

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from typing import List
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)
2019-10-05 05:14:13 +00:00
if __name__ == "__main__":
import doctest
doctest.testmod()