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gh-157361: Implement anext() in Python instead of C - #157362
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Remove the C implementation of the anext() builtin and the anext_awaitable helper type. Instead, compile a small Python source at interpreter startup and copy the resulting anext() function into the builtins dict. The Python version keeps the C semantics: __anext__ is looked up on the type and called eagerly, the one-argument form returns the awaitable unchanged, and the two-argument form wraps it in a coroutine that returns the default on StopAsyncIteration. The source is executed from pycore_init_builtins() rather than _PyBuiltin_Init(), since running bytecode requires the interpreter's common constants, which are only set up after the builtins module is created.
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Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
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I'm merging this to start working on implementing |
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Remove the C implementation of the
anext()builtin and theanext_awaitablehelper type. A_pybuiltinsmodule is created with the implementation and that is frozen into the interpreter using the existing freeze infrastructure.The Python version keeps the C semantics:
__anext__is looked up on the type and called eagerly, the one-argument form returns the awaitable unchanged, and the two-argument form wraps it in a coroutine that returns the default onStopAsyncIteration.I'll implement
aitersimilarly in a followup.anextandaiterin pure Python #157361