[issue27181] Add geometric mean to `statistics` module

[Ram Rachum]

Ram Rachum added the comment:

To complicate things further...

I implemented a geometric mean on my own, and then I figured out what I really want is a *weighted* geometric mean, so I implemented that for myself. If you'd want to include that, that'll be cool. Actually I'm not sure if the goal of the `statistics` module is to be comprehensive or minimal. I'm hoping it's meant to be comprehensive. But then I'd guess there would be a lot of things you'd want to add except my little feature.

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<http://bugs.python.org/issue27181>
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