[issue14521] math.copysign(1., float('nan')) returns -1.

[mattip]

New submission from mattip <matti.picus at gmail.com>:

Python 2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import math
>>> math.copysign(1., float('inf'))
1.0
>>> math.copysign(1., float('-inf'))
-1.0
>>> math.copysign(1., float('nan'))
-1.0
>>> math.copysign(1., float('-nan'))
1.0
>>>

----------
components: None
messages: 157746
nosy: mattip
priority: normal
severity: normal
status: open
title: math.copysign(1., float('nan')) returns -1.
type: behavior
versions: Python 2.7

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14521>
_______________________________________