[issue39094] Add a default to statistics.mean and related functions

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

What would the proposal look like for `statistics.stdev`? There you need at least two data points to compute a result, and a user might want to do different things for an empty dataset versus a single data point.

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nosy: +mark.dickinson

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39094>
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