R. David Murray added the comment:

If I remember correctly, the exceptions adhere to the standard because it gives 
the option of "signaling" in those cases (but in any case it is the behavior we 
want).  

0.5 is a float, so x**.5 is not the square root.

   >>> math.sqrt(-0.0)
   -0.0

I'm closing this but nosying Mark Dickinson, who will correct me if I got 
anything wrong :)

----------
nosy: +mark.dickinson, r.david.murray
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30933>
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