Finding the average of a list

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On Python 3.8+, with floats, you can use statistics.fmean as it’s faster with floats.

On Python 3.4+, you can use statistics.mean:

l = [15, 18, 2, 36, 12, 78, 5, 6, 9]

import statistics
statistics.mean(l)  # = 20.11111111111111

On older versions of Python you can:

sum(l) / len(l)

On Python 2, you need to convert len to a float to get float division

sum(l) / float(len(l))

There is no need to use functools.reduce as it is much slower.

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