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

mattip report at bugs.python.org
Sat Apr 7 20:43:06 CEST 2012


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

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