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

[Marko Rauhamaa]

Nick Coghlan <ncoghlan at gmail.com>:

> Right, it's not a mere optimisation - it's the only way to get
> containers to behave sensibly. Otherwise we'd end up with nonsense
> like:
>
>>>> x = float("nan")
>>>> x in [x]
> False

Why is that nonsense? I mean, why is it any more nonsense than

   >>> x == x
   False

Anyway, personally, I'm perfectly "happy" to live with the choices of
past generations, regardless of whether they were good or not. What you
absolutely don't want to do is "correct" the choices of past generations.


Marko