Issue 28955: Not matched behavior of numeric comparison with the documentation (original) (raw)

Issue28955

Created on 2016-12-13 04:09 by woo yoo, last changed 2022-04-11 14:58 by admin. This issue is now closed.

Messages (5)
msg283069 - (view)	Author: woo yoo (woo yoo)	Date: 2016-12-13 04:09
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
msg283070 - (view)	Author: woo yoo (woo yoo)	Date: 2016-12-13 04:13
Maybe the description should be changed into "all order comparisons of not-a-number and any number will return False"
msg283096 - (view)	Author: R. David Murray (r.david.murray) *	Date: 2016-12-13 11:45
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.
msg325373 - (view)	Author: Benjamin Peterson (benjamin.peterson) *	Date: 2018-09-14 17:48
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
msg325377 - (view)	Author: miss-islington (miss-islington)	Date: 2018-09-14 18:05
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