asyncio Generic classes should return GenericAlias in __class_getitem__

@asvetlov

BPO	46469
Nosy	@asvetlov, @1st1, @miss-islington, @kumaraditya303
PRs	bpo-46469: Make asyncio generic classes return GenericAlias #30777 [3.10] bpo-46469: Make asyncio generic classes return GenericAlias (GH-30777) #30784 [3.9] bpo-46469: Make asyncio generic classes return GenericAlias (GH-30777) #30785

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2022-01-22.14:10:04.875>
created_at = <Date 2022-01-22.04:41:15.324>
labels = ['type-bug', '3.9', '3.10', '3.11']
title = 'asyncio Generic classes should return GenericAlias in __class_getitem__'
updated_at = <Date 2022-01-22.14:10:04.874>
user = 'https://github.com/kumaraditya303'

bugs.python.org fields:

activity = <Date 2022-01-22.14:10:04.874>
actor = 'asvetlov'
assignee = 'none'
closed = True
closed_date = <Date 2022-01-22.14:10:04.875>
closer = 'asvetlov'
components = []
creation = <Date 2022-01-22.04:41:15.324>
creator = 'kumaraditya'
dependencies = []
files = []
hgrepos = []
issue_num = 46469
keywords = ['patch']
message_count = 4.0
messages = ['411231', '411249', '411251', '411254']
nosy_count = 4.0
nosy_names = ['asvetlov', 'yselivanov', 'miss-islington', 'kumaraditya']
pr_nums = ['30777', '30784', '30785']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue46469'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

In asyncio, the Generic classes return the class itself in __class_getitem__ instead of GenericAlias, because of this they cannot be introspected as GenericAlias objects.

Running Debug|x64 interpreter...
Python 3.11.0a4+ (main, Jan 22 2022, 10:00:18) [MSC v.1930 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import asyncio
>>> asyncio.Future
<class '_asyncio.Future'>
>>> asyncio.Future[int] 
<class '_asyncio.Future'>
>>> list
<class 'list'>
>>> list[int]
list[int]
>>> list[int].__args__
(<class 'int'>,)
>>> asyncio.Future[int].__args__
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: type object '_asyncio.Future' has no attribute '__args__'

New changeset ea5b968 by Kumar Aditya in branch 'main':
bpo-46469: Make asyncio generic classes return GenericAlias (GH-30777)
ea5b968

New changeset 90e2998 by Miss Islington (bot) in branch '3.10':
[3.10] bpo-46469: Make asyncio generic classes return GenericAlias (GH-30777) (bpo-30784)
90e2998

New changeset 6ed874f by Kumar Aditya in branch '3.9':
[3.9] bpo-46469: Make asyncio generic classes return GenericAlias (GH-30777) (GH-30785)
6ed874f

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asyncio Generic classes should return GenericAlias in __class_getitem__ #90627

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asyncio Generic classes should return GenericAlias in __class_getitem__ #90627

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kumaraditya303 commented on Jan 22, 2022

asvetlov commented on Jan 22, 2022

asvetlov commented on Jan 22, 2022

miss-islington commented on Jan 22, 2022

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