[issue27353] Add nroot function to math

[Tim Peters]

Tim Peters added the comment:

Note that the very popular TI graphics calculators have had a distinct nth-root function at least since the TI-83.  It's a minor convenience there.

I'm +0 on adding it to Python's math module, which means not enough to do any work ;-)

Note that if it is added to `math`, it should also be added to `cmath`.

Short of that, a private function in `statistics` seems best to me.

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<http://bugs.python.org/issue27353>
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