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Mapped list average
Python, Math, List · Nov 2, 2020
Calculates the average of a list, after mapping each element to a value using the provided function.
- Use
map()to map each element to the value returned byfn. - Use
sum()to sum all of the mapped values, divide bylen(lst). - Omit the last argument,
fn, to use the default identity function.
def average_by(lst, fn = lambda x: x):
return sum(map(fn, lst), 0.0) / len(lst)average_by([{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }], lambda x: x['n'])
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