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F4 `types.GenericAlias` has extra `__copy__` and `__deepcopy__` in `__dir__` · Issue #105487 · python/cpython · GitHub
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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
@sobolevn

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@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 🤔

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