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'array.array' has no attribute 'clear' #11008

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'array.array' has no attribute 'clear'#11008
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stubs: false negativeType checkers do not report an error, but should

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@NCPlayz
NCPlayz
opened on Nov 10, 2023

array.array inheriting from MutableSequence has some unintended consequences, such as below

import array

x = array.array("B")
x.clear()

At runtime array.array does not have .clear(). Is it meant to have a .clear() implemented? Right now at least it doesn't and the stubs give an incorrect definition.

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  1. JelleZijlstra commented on Nov 10, 2023

    @JelleZijlstra
    JelleZijlstra
    on Nov 10, 2023
    Member

    This should probably be considered a CPython bug: array claims to be a MutableSequence at runtime, but doesn't implement the full ABC.

    >>> issubclass(array.array, collections.abc.MutableSequence)
True
>>> collections.abc.MutableSequence.clear
<function MutableSequence.clear at 0x1031579c0>
>>> array.array.clear
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: type object 'array.array' has no attribute 'clear'
  2. AlexWaygood
    added
    stubs: false negativeType checkers do not report an error, but should
    on Nov 10, 2023

  3. mikeziminio commented on Feb 2, 2024

    @mikeziminio
    mikeziminio
    on Feb 2, 2024
    Contributor

    I have added the issue to the cpython repository: python/cpython#114894

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