[issue27181] Add geometric mean to `statistics` module

[Ram Rachum]

Ram Rachum added the comment:

Also... I like the detailed docstrings with the real-life examples! That stuff helps when coding and using an unfamiliar function (since I see the docs in a panel of my IDE), so I wish I'd see more detailed docstrings like these ones in the standard library. For `geometric_mean`, maybe I'd add one sentence that describes how the geometric mean is calculated.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27181>
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