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Re: NaN comparisons - Call For Anecdotes

From Marko Rauhamaa <marko@pacujo.net>
Newsgroups comp.lang.python
Subject Re: NaN comparisons - Call For Anecdotes
Date 2014-07-08 20:31 +0300
Organization A noiseless patient Spider
Message-ID <871ttvahaq.fsf@elektro.pacujo.net> (permalink)
References <53BC05FB.4050707@jmunch.dk> <mailman.11630.1404832805.18130.python-list@python.org> <878uo3akqy.fsf@elektro.pacujo.net> <mailman.11640.1404836832.18130.python-list@python.org>

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Chris Angelico <rosuav@gmail.com>:

> I'd say it would surprise people rather a lot if operations like dict
> insertion/lookup could trigger arithmetic exceptions. :)

That wouldn't trigger exceptions.

Dict operations do an "is" test before an "==" test. In fact, you
couldn't even use NaN as a dict key otherwise. Thus, dict operations
never test NaN == NaN.


Marko

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Thread

Re: NaN comparisons - Call For Anecdotes Chris Angelico <rosuav@gmail.com> - 2014-07-09 01:19 +1000
  Re: NaN comparisons - Call For Anecdotes Marko Rauhamaa <marko@pacujo.net> - 2014-07-08 19:16 +0300
    Re: NaN comparisons - Call For Anecdotes Chris Angelico <rosuav@gmail.com> - 2014-07-09 02:27 +1000
      Re: NaN comparisons - Call For Anecdotes Marko Rauhamaa <marko@pacujo.net> - 2014-07-08 20:31 +0300
        Re: NaN comparisons - Call For Anecdotes Chris Angelico <rosuav@gmail.com> - 2014-07-09 03:54 +1000
        Re: NaN comparisons - Call For Anecdotes Chris Angelico <rosuav@gmail.com> - 2014-07-09 03:57 +1000
        Re: NaN comparisons - Call For Anecdotes Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-07-08 18:12 +0000
    Re: NaN comparisons - Call For Anecdotes Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-07-08 18:10 +0000

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