On Sun, Aug 29, 2021 at 2:01 PM Serhiy Storchaka <storchaka@gmail.com> wrote:

> So my question is whether the discrepancy between what `async for`
> expects and what `aiter()` expects on purpose?
> https://bugs.python.org/issue31861 <https://bugs.python.org/issue31861>
> was the issue for creating aiter() and I didn't notice a discussion of
> this difference. The key reason I'm asking is this does cause a
> deviation compared to the relationship between `for` and `iter()` (which
> does not require `__iter__` to be defined on the iterator, although
> collections.abc.Iterator does). It also makes the glossary definition
> being linked from
> https://docs.python.org/3.10/reference/compound_stmts.html#the-async-for-statement
> <https://docs.python.org/3.10/reference/compound_stmts.html#the-async-for-statement>
> incorrect.

PyIter_Check() only checks existence of __next__, not __iter__ (perhaps
for performance reasons).

Or maybe no one thought to require __iter__ for iterators?