Message 58429 - Python tracker

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Author	christian.heimes
Recipients	christian.heimes, gvanrossum, nascheme, noam, tim.peters
Date	2007-12-11.13:46:41
SpamBayes Score	0.22976723
Marked as misclassified	No
Message-id	<475E94C0.2090007@cheimes.de>
In-reply-to	<b348a0850712110521m31398f5dob03fc2016025dddf@mail.gmail.com>

Content
Noam Raphael wrote: > * nan is an object of type float, which behaves like None, that is: > "nan == nan" is true, but "nan < nan" and "nan < 3" will raise an > exception. No, that's not correct. The standard defines that nan is always unequal to nan. False >>> float("inf") == float("inf") True >>> float("inf") == -1*float("-inf") True The float module could gain three singletons nan, inf an neginf so you can do True Christian

Noam Raphael wrote:
> * nan is an object of type float, which behaves like None, that is:
> "nan == nan" is true, but "nan < nan" and "nan < 3" will raise an
> exception. 

No, that's not correct. The standard defines that nan is always unequal
to nan.

False
>>> float("inf") == float("inf")
True
>>> float("inf") == -1*float("-inf")
True

The float module could gain three singletons nan, inf an neginf so you
can do

True

Christian

History
Date	User	Action	Args
2007-12-11 13:46:41	christian.heimes	set	spambayes_score: 0.229767 -> 0.22976723 recipients: + christian.heimes, gvanrossum, tim.peters, nascheme, noam
2007-12-11 13:46:41	christian.heimes	link	issue1580 messages
2007-12-11 13:46:41	christian.heimes	create