New submission from Arnuld <lispyarn...@gmail.com>: In section "6.10.1 Value comparisons", it is written:
https://docs.python.org/3/reference/expressions.html "The not-a-number values float('NaN') and decimal.Decimal('NaN') are special. Any ordered comparison of a number to a not-a-number value is false. A counter-intuitive implication is that not-a-number values are not equal to themselves. For example, if x = float('NaN'), 3 < x, x < 3, x == x, x != x are all false. This behavior is compliant with IEEE 754." Last comparison "x != x" does not return False, it returns True. Here is the output from my iPython interpeter I am using on Arch Linux (latest as of today): In [86]: x == y Out[86]: False In [87]: x != y Out[87]: True I verified the bug it on Wikipedia too: https://en.wikipedia.org/wiki/NaN#Comparison_with_NaN ---------- assignee: docs@python components: Documentation files: Screenshot_2020-04-04 6 Expressions — Python 3 8 2 documentation.png messages: 365742 nosy: ArnuldOnData, docs@python priority: normal severity: normal status: open title: Python Language Reference Documentation type: enhancement versions: Python 3.7, Python 3.8, Python 3.9 Added file: https://bugs.python.org/file49033/Screenshot_2020-04-04 6 Expressions — Python 3 8 2 documentation.png _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue40177> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
