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

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

Chris Angelico rosuav at gmail.com
Sun Jul 13 18:34:20 CEST 2014


On Mon, Jul 14, 2014 at 2:23 AM, Steven D'Aprano <steve at pearwood.info> wrote:

We will see later that that happens. Further, when comparing float NaNs of the same identity, the list implementation forgot to special-case NaNs. Which would be a bug, IMHO. "Forgot"? I don't think the behaviour of list comparisons is an accident.

Well, "forgot" is on the basis that the identity check is intended to be a mere optimization. If that were the case ("don't actually call eq when you reckon it'll return True"), then yes, failing to special-case NaN would be a bug. But since it's intended behaviour, as explained further down, it's not a bug and not the result of forgetfulness.

ChrisA



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