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average_by python Code Snippet in 2022

mathlistintermediate

Last Updated: 26 November 2022

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 by fn.
  • Use sum() to sum all of the mapped values, divide by len(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']) # 5.0

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