[Python-Dev] == on object tests identity in 3.x (original) (raw)

[Python-Dev] == on object tests identity in 3.x - list delegation to members?

Andreas Maier andreas.r.maier at gmx.de
Wed Jul 16 13:40:03 CEST 2014

Am 13.07.2014 22:05, schrieb Akira Li:

Nick Coghlan <ncoghlan at gmail.com> writes: ...

definition of floats and the definition of container invariants like "assert x in [x]")

The current approach means that the lack of reflexivity of NaN's stays confined to floats and similar types - it doesn't leak out and infect the behaviour of the container types. What we've never figured out is a good place to document it. I thought there was an open bug for that, but I can't find it right now. There was related issue "Tuple comparisons with NaNs are broken" http://bugs.python.org/issue21873 but it was closed as "not a bug" despite the corresponding behavior is not documented anywhere.

I currently know about these two issues related to fixing the docs:

http://bugs.python.org/11945 - about NaN values in containers http://bugs.python.org/12067 - comparisons

I am working on the latter, currently. The patch only targets the comparisons chapter in the Language Reference, there is another comparisons chapter in the Library Reference, and one in the Tutorial.

I will need to update the patch to issue 12067 as a result of this discussion.

Andy

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