@@ -13,6 +13,26 @@ Post-History:
1313 `19-Jul-2025 <https://discuss.python.org/t/pep-798-unpacking-in-comprehensions/99435 >`__,
1414Resolution: `03-Nov-2025 <https://discuss.python.org/t/pep-798-unpacking-in-comprehensions/99435/60 >`__
1515
16+ .. note ::
17+ The Steering Council accepts this PEP with one modification: we require that
18+ both synchronous and asynchronous generator expressions use explicit loops
19+ rather than yield from for unpacking operations.
20+
21+ The Steering Council believes that simplicity and consistency are paramount
22+ here. The delegation behaviour provided by ``yield from `` adds semantic
23+ complexity for advanced use cases involving ``.send(), `` ``.throw() ``, and
24+ ``.close() `` that are rarely relevant when writing comprehensions. We don’t
25+ believe that developers writing comprehensions should have to think about
26+ the differences between sync and async generator semantics or about generator
27+ delegation protocols. We firmly believe that the mental model should be as
28+ simple as possible and as symmetric as possible between all kinds of
29+ comprehensions. The straightforward semantics of explicit loops provide a
30+ uniform mental model that works the same way regardless of context, and also
31+ provides better parity with the function-like versions, such as
32+ ``itertools.chain.from_iterable ``. For the rare cases where someone actually
33+ needs delegation behaviour, the Steering Council believes they should use an
34+ explicit generator function with ``yield from `` rather than a comprehension.
35+
1636
1737Abstract
1838========
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