Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

I don't feel a need to change anything, my post hit a few seconds after yours 
:-) 

That said, "return u ** (-1.0 / alpha)" would be a slight, but nice improvement.

It might also be reasonable to document a safe range of alpha values.

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<https://bugs.python.org/issue41421>
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