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types.GenericAlias has extra __copy__ and __deepcopy__ in __dir__ #105487

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types.GenericAlias has extra __copy__ and __deepcopy__ in __dir__#105487
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interpreter-core(Objects, Python, Grammar, and Parser dirs)topic-typingtype-bugAn unexpected behavior, bug, or error

Description

@sobolevn
sobolevn
opened on Jun 8, 2023

Repro:

>>> type A[X] = list[X]
>>> dir(A[int])
[..., '__copy__', '__deepcopy__', ...]

We can access all other attributes, but not __copy__ and __deepcopy__:

>>> A[int].__copy__
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'types.GenericAlias' object has no attribute '__copy__'. Did you mean: '__doc__'?

>>> A[int].__deepcopy__
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'types.GenericAlias' object has no attribute '__deepcopy__'

I am not quite sure what is the right thing to do here 🤔

Linked PRs

Activity

  1. sobolevn
    added
    type-bugAn unexpected behavior, bug, or error
    topic-typing
    on Jun 8, 2023
  2. sobolevn
    added a commit that references this issue on Jun 8, 2023

    pythongh-105487: Change the `repr` of `ParamSpec` list of args in `Ge…

    3402de9

  3. hugovk commented on Nov 10, 2023

    @hugovk
    hugovk
    on Nov 10, 2023
    Member

    Thanks for the fix!

  4. hugovk
    closed this as completedon Nov 10, 2023

  5. asottile-sentry commented on Sep 5, 2025

    @asottile-sentry
    asottile-sentry
    on Sep 5, 2025

    a little late to the party but __bases__ appears to not work as well:

    >>> '__bases__' in dir(list[str])
True
>>> list[str].__bases__
Traceback (most recent call last):
  File "<python-input-15>", line 1, in <module>
    list[str].__bases__
AttributeError: 'types.GenericAlias' object has no attribute '__bases__'. Did you mean: '__args__'?
  6. sobolevn
    reopened this on Sep 6, 2025
  7. sobolevn
    added a commit that references this issue on Sep 6, 2025

    pythongh-105487: Fix `__dir__` entries of `GenericAlias`

    110e6b0

  8. sobolevn commented on Sep 6, 2025

    @sobolevn
    sobolevn
    on Sep 6, 2025
    MemberAuthor

    Looks like the linked PR does something completely different. I created a new one.

  9. sobolevn commented on Sep 6, 2025

    @sobolevn
    sobolevn
    on Sep 6, 2025
    MemberAuthor

    Thanks for the report!

  10. picnixz
    added
    interpreter-core(Objects, Python, Grammar, and Parser dirs)
    on Sep 6, 2025
  11. sobolevn
    added 2 commits that reference this issue on Sep 6, 2025

    pythongh-105487: Fix `__dir__` entries of `GenericAlias`

    1eac463

    gh-105487: Fix `__dir__` entries of `GenericAlias` (#138578)

    b0420b5
  12. miss-islington
    added a commit that references this issue on Sep 7, 2025

    pythongh-105487: Fix `__dir__` entries of `GenericAlias` (pythonGH-13…

    200f76f
  13. sobolevn
    added 2 commits that reference this issue on Sep 8, 2025

    [3.13] pythongh-105487: Fix `__dir__` entries of `GenericAlias` (pyth…

    ee40172

    [3.13] gh-105487: Fix `__dir__` entries of `GenericAlias` (GH-138578) (…

    d3b6bb1
  14. lkollar
    added a commit that references this issue on Sep 9, 2025

    pythongh-105487: Fix `__dir__` entries of `GenericAlias` (python#138578)

    b42938b
  15. encukou
    added a commit that references this issue on Oct 7, 2025

    [3.14] gh-105487: Fix `__dir__` entries of `GenericAlias` (GH-138578) (…

    09fdd21
  16. hugovk
    closed this as completedon Jul 24, 2026
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