[issue43908] array.array and re types must be immutable: add Py_TPFLAGS_IMMUTABLETYPE flag

[Guido van Rossum]

Guido van Rossum <gvanrossum at gmail.com> added the comment:

That is as intended, right?

On Thu, Apr 29, 2021 at 07:59 STINNER Victor <report at bugs.python.org> wrote:

>
> STINNER Victor <vstinner at python.org> added the comment:
>
> check_set_special_type_attr() is used to prevent setting the following
> attributes:
>
> * __name__
> * __qualname__
> * __module__
> * __bases__
> * __doc__
>
> Right now, I cannot set the attribues on array.array type:
>
> $ ./python
> Python 3.10.0a7+ (heads/debug_doc2-dirty:0623fdb60d, Apr 29 2021, 12:06:18)
> >>> import array
>
> >>> array.array.__name__ = 'newname'
> TypeError: can't set attributes of built-in/extension type 'array.array'
>
> >>> array.array.__qualname__ = 'newname'
> TypeError: can't set attributes of built-in/extension type 'array.array'
>
> >>> array.array.__module__ = 'new module'
> TypeError: can't set attributes of built-in/extension type 'array.array'
>
> >>> array.array.__bases__ = (int,)
> TypeError: can't set attributes of built-in/extension type 'array.array'
>
> >>> array.array.__doc__ = 'doc'
> TypeError: can't set attributes of built-in/extension type 'array.array'
>
> I guess that type_setattro() is used and it checks for
> Py_TPFLAGS_IMMUTABLETYPE flag early.
>
> ----------
>
> _______________________________________
> Python tracker <report at bugs.python.org>
> <https://bugs.python.org/issue43908>
> _______________________________________
>
-- 
--Guido (mobile)

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43908>
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