8000 gh-100315: clarification to `__slots__` docs. by kwsp · Pull Request #102621 · python/cpython · GitHub
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gh-100315: clarification to __slots__ docs.
refer to tp_itemsize in discussion on "variable-length" built-in types
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kwsp committed Mar 12, 2023
commit 6f6ba2740c2cf6eea37d297f6fae0bb523aee264
3 changes: 2 additions & 1 deletion Doc/reference/datamodel.rst
Original file line number Diff line number Diff line change
Expand Up @@ -1945,7 +1945,8 @@ Notes on using *__slots__*
program undefined. In the future, a check may be added to prevent this.

* Nonempty *__slots__* does not work for classes derived from "variable-length"
built-in types such as :class:`int`, :class:`bytes` and :class:`tuple`.
built-in types such as :class:`int`, :class:`bytes` and :class:`tuple`
(see :c:member:`~PyTypeObject.tp_itemsize`).

* Any non-string :term:`iterable` may be assigned to *__slots__*.

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