[issue28955] Not matched behavior of numeric comparison with the documentation

[miss-islington]

miss-islington  added the comment:


New changeset ca2fa2841f8e3ce5213a0e8c0abc1d0fdc7d386b by Miss Islington (bot) 
in branch '3.7':
closes bpo-28955: Clarified comparisons between NaN and number in reference 
documentation (GH-5982)
https://github.com/python/cpython/commit/ca2fa2841f8e3ce5213a0e8c0abc1d0fdc7d386b


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[issue28955] Not matched behavior of numeric comparison with the documentation

[Benjamin Peterson]

Benjamin Peterson  added the comment:


New changeset ad8a0004206ba7aec5a8a60fce413da718080db2 by Benjamin Peterson 
(Tony Flury) in branch 'master':
closes bpo-28955: Clarified comparisons between NaN and number in reference 
documentation (GH-5982)
https://github.com/python/cpython/commit/ad8a0004206ba7aec5a8a60fce413da718080db2


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nosy: +benjamin.peterson
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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[issue28955] Not matched behavior of numeric comparison with the documentation

[miss-islington]

Change by miss-islington :


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pull_requests: +8740

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[issue28955] Not matched behavior of numeric comparison with the documentation

[Serhiy Storchaka]

Change by Serhiy Storchaka :


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nosy: +mark.dickinson

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[issue28955] Not matched behavior of numeric comparison with the documentation

[Anthony Flury]

Change by Anthony Flury :


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keywords: +patch
pull_requests: +5748
stage: needs patch -> patch review

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[issue28955] Not matched behavior of numeric comparison with the documentation

[Cheryl Sabella]

Change by Cheryl Sabella :


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keywords: +easy
stage:  -> needs patch
type: behavior -> enhancement
versions: +Python 3.7, Python 3.8 -Python 3.5

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[issue28955] Not matched behavior of numeric comparison with the documentation

[R. David Murray]

R. David Murray added the comment:

Sure, we like to make the docs more precise when it doesn't interfere with the 
presentation.  Perhaps something like:  "Additionally, ordering comparisions 
involving not-a-number values will always return False."

I wonder if we should also mention here that this follows the IEEE standard.

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[issue28955] Not matched behavior of numeric comparison with the documentation

[woo yoo]

woo yoo added the comment:

Maybe the description should be changed into "all order comparisons of 
not-a-number and any number will return False"

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[issue28955] Not matched behavior of numeric comparison with the documentation

[woo yoo]

New submission from woo yoo:

According to the documentation, which said "Additionally, comparing any number 
to a not-a-number value will return False. ",the comparison of `float('nan')!= 
1`should yield False, while the result is True.

Small errors like this in documentation should be corrected?

The related link 
https://docs.python.org/3/reference/expressions.html#value-comparisons

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assignee: docs@python
components: Documentation
messages: 283069
nosy: docs@python, woo yoo
priority: normal
severity: normal
status: open
title: Not matched behavior of numeric comparison with the documentation
type: behavior
versions: Python 3.5

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