Raymond Hettinger <raymond.hettin...@gmail.com> added the comment: My recommendation is to have *weights* as an optional argument:
statistics.mean(values, weights=None) While it is tempting to special case dicts and counters, I got feedback from Jake Vanderplas and Wes McKinney that in practice it is more common to have the weights as a separate list/array/vector. That API has other advantages as well. For starters, it is a simple extension of the existing API, so it isn't a disruptive change. Also, it works well with mapping views: statistics.mean(vehicle_sales.keys(), vehicle_sales.values()) And the API also helps support use cases where different weightings are being explored for the same population: statistics.mean(salary, years_of_service) statistics.mean(salary, education) statistics.mean(salary, age) ---------- nosy: +rhettinger versions: +Python 3.7 -Python 3.5 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue20479> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com