A.M. Kuchling added the comment:
Actually ISTM the 'if x is NaN' sentence can also go; it seems to just copy the
sign bit no matter what x and y are.
>>> from math import *
>>> nan = float('nan')
>>> neg = -nan
>>> copysign(+1, copysign(nan, neg))
-1.0
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<http://bugs.python.org/issue12211>
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