[issue23185] add inf and nan to math module

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

May be make math.inf and math.nan special objects so that for all x (except inf and nan):

x < math.inf
x > -math.inf
not (x < math.nan)
not (x > math.nan)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23185>
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