Mark Dickinson added the comment:
More examples, showing that `y` is not ignored when `x` is a NaN.
>>> result1 = copysign(float('nan'), 1.0)
>>> result2 = copysign(float('nan'), -1.0)
>>> copysign(1.0, result1) # result1 is a NaN whose sign bit is cleared.
1.0
>>> copysign(1.0, result2) # result2 is a NaN whose sign bit is set.
-1.0
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<http://bugs.python.org/issue12211>
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