make list_iterator able to be converted to bool

[ConnorTippets]

Feature or enhancement

Proposal:

Currently, if you cast an empty list iterator (iter([])) to a bool, you get True

> bool(iter([]))
True

This is opposed to casting an empty list ([]) to a bool, where you get the much more reasonable result of False

> bool([])
False

I propose properly implementing boolean conversion for list_iterator, to prevent potentially confusing and unintuitive bugs.

I had a bit of a look under the hood, and I believe implementing tp_as_sequence in the _PyListIterObject class in /Include/internal/pycore_list.h on lines 69-73 would resolve this issue.

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

[sirosen]

Please understand that the requirement for a prior discussion exists in order to manage the project in a sustainable way.

The devguide for CPython is fairly clear about this expectation.

[ConnorTippets]

Whoops, sorry! Haven't done this before, and I mostly just read the page about the issue tracker and not much else.