Nikita Sobolev <m...@sobolevn.me> added the comment:
It does not happen on `3.11` (main):
```
Python 3.11.0a4+ (heads/main-dirty:ef3ef6fa43, Jan 20 2022, 20:48:25) [Clang
11.0.0 (clang-1100.0.33.16)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> class A:
... __slots__ = ('x',)
...
>>> A.__slots__ += ('y',)
>>> A.__slots__
('x', 'y')
>>> a = A()
>>> a.__slots__
('x', 'y')
>>> a.__slots__ += ('z',)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'A' object attribute '__slots__' is read-only
>>> a.__slots__
('x', 'y')
```
It also does not happen on `3.9`:
```
Python 3.9.9 (main, Dec 21 2021, 11:35:28)
[Clang 11.0.0 (clang-1100.0.33.16)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> class A:
... __slots__ = ('x',)
...
>>> a = A()
>>> a.__slots__ += ('y',)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'A' object attribute '__slots__' is read-only
>>> a.__slots__
('x',)
```
----------
nosy: +sobolevn
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46550>
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