[issue27181] Add geometric mean to `statistics` module

[Roundup Robot]

Roundup Robot added the comment:

New changeset de0fa478c22e by Steven D'Aprano in branch '3.6':
Issue #27181 remove geometric_mean and defer for 3.7.
https://hg.python.org/cpython/rev/de0fa478c22e

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