Add aiter and anext builtin function #3609

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1. youknowone

   added

   good first issueGood for newcomersGood for newcomers

   on Apr 14, 2022
2. Snowapril commented on Apr 14, 2022

   

   Snowapril

   on Apr 14, 2022

   Last edited by youknowone

   Contributor

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   builtins.aiter can be implemented quite easy with just a few lines of code.
   but for builtins.anext, it seems anext_awaitable must be implemented first.

   static PyObject *
   builtin_anext_impl(PyObject *module, PyObject *aiterator,
                      PyObject *default_value)
   {
       // ...skip
       awaitable = (*t->tp_as_async->am_anext)(aiterator);
       if (default_value == NULL) {
           return awaitable;
       }
   
       PyObject* new_awaitable = PyAnextAwaitable_New(
               awaitable, default_value);
       Py_DECREF(awaitable);
       return new_awaitable;
   }

   👍React with 👍1Reacted by Jeong, YunWon
3. sum12 commented on Apr 17, 2022

   

   sum12

   on Apr 17, 2022

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   Thanks for the "good for issue". I am probably misunderstanding things.
   the slots for tp_as_async->am_aiter is missing. According to cpython that would be the correct way to check if the object has __aiter__ implementaed, Is this the correct way to proceed, probably an outline of how this could be done would be great
4. youknowone commented on Apr 18, 2022

   

   youknowone

   on Apr 18, 2022

   MemberAuthor

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   @sum12 you are right. that's the right way. But instead of the right way, you can implement it by calling __aiter__ directly.

   If you are interested in the right way, You can do it by looking at other slots, like IterNext or Callable. The right way would not be the 'good first issue'.
5. sum12

   added 3 commits that reference this issue on Apr 19, 2022

   implement aiter

   ...

   ff54846

   implement aiter

   ...

   a6d9047

   implement aiter

   ...

   8455c74
6. youknowone

   removed

   good first issueGood for newcomersGood for newcomers

   on Apr 22, 2022
7. youknowone

   added

   A-stdlib

   on May 8, 2022
8. sidx04 commented on May 26, 2025

   

   sidx04

   on May 26, 2025

   Last edited by sidx04

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   hey @youknowone @sum12 @Snowapril , i see builtins.anext is still not implemented, however builtins.aiter is. is it possible for me to take on this issue? from what I have understood, I think anext calls the aiter to fetch an async iterator which is then processed in the anext func. I'm assuming I can use this as a starting point to model anext_awaitable.

   Any guidance would be appreciated!
9. YashSuthar983

   added 4 commits that reference this issue on Oct 28, 2025

   Added miniml anext() implementation

   ...

   f96a823

   Added miniml anext() implementation

   ...

   ae8a3be

   Added miniml anext() implementation

   ...

   452e6e4

   Implement minimal builtins.anext()

   ...

   d08b04e
10. youknowone commented on Dec 25, 2025

    

    youknowone

    on Dec 25, 2025

    Last edited by youknowone

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    Thanks @sum12 and @YashSuthar983 ! this is done!

    Thanks @Snowapril for advices

    😄React with 😄1Reacted by Snowapril
11. youknowone

    closed this as completedon Dec 25, 2025