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

[Guido van Rossum]

Guido van Rossum  added the comment:

That is as intended, right?

On Thu, Apr 29, 2021 at 07:59 STINNER Victor  wrote:

>
> STINNER Victor  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.
>
> --
>
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> Python tracker 
> 
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-- 
--Guido (mobile)

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

[STINNER Victor]

STINNER Victor  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.

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

[STINNER Victor]

Change by STINNER Victor :


--
title: array.array should remain immutable: add Py_TPFLAGS_IMMUTABLETYPE flag 
-> array.array and re types must be immutable: add Py_TPFLAGS_IMMUTABLETYPE flag

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