Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!eternal-september.org!feeder.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Marko Rauhamaa Newsgroups: comp.lang.python Subject: Re: NaN comparisons - Call For Anecdotes Date: Tue, 08 Jul 2014 19:16:53 +0300 Organization: A noiseless patient Spider Lines: 10 Message-ID: <878uo3akqy.fsf@elektro.pacujo.net> References: <53BC05FB.4050707@jmunch.dk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Injection-Info: mx05.eternal-september.org; posting-host="ff5cf27ef3d5b31f034d3b72bdc27a41"; logging-data="4069"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+7IAwXqouPbe3YAKwvbiTY" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.3 (gnu/linux) Cancel-Lock: sha1:1me0SEW2KwuqYGWTaU//+86IYVM= sha1:hJL0ybtnwLjqQmNJKfGEpiwXkaQ= Xref: csiph.com comp.lang.python:74180 Chris Angelico : > Why *should* all NaNs be equal to each other? I appreciate why you can't say NaN is equal to NaN. However, shouldn't the very comparison attempt trigger an arithmetic exception? After all, so does a division by zero. Marko