Backport PEP 695's TypeAliasType

[adriangb]

Cross-referencing here for visibility.

https://discuss.python.org/t/please-consider-delaying-or-even-rejecting-pep-695/26408/62?u=adriangb
https://mail.python.org/archives/list/typing-sig@python.org/thread/T5MRLQL7H4Y4HWFA7CBC34MHJCKQEI7L/

cc @JelleZijlstra, I didn't want to bug everyone in the discuss thread 😅

[adriangb]

Thank you Jelle!

[leonartdoss]

Hello @adriangb!
Since I implemented pydantic in my project, I'm getting the following error:

Invalid lambda response received: Invalid API Gateway Response Keys: {'requestId', 'stackTrace', 'errorType', 'errorMessage'} 
in {'errorMessage': "Unable to import module 'main.app': cannot import name 'TypeAliasType' from 'typing_extensions'          
(/opt/python/typing_extensions.py)", 'errorType': 'Runtime.ImportModuleError', 'requestId':                                   
'194b3776-a307-40b0-b5f7-945eb949f3db', 'stackTrace': []} 

It's a lambda function (AWS) which contains some Pydantic models. I'm using python 3.9.
Do you think that my problem can be related to this issue?

Thank you!
Leonardo

[adriangb]

Yes but you must have mispecified your dependencies:

https://github.com/pydantic/pydantic/blob/5baac76d893a226f02be29def9446352e18cabbc/pyproject.toml#L62

We require typing-extensions >= 4.6.1 which included this addition.

[leonartdoss]

Yes but you must have mispecified your dependencies:

https://github.com/pydantic/pydantic/blob/5baac76d893a226f02be29def9446352e18cabbc/pyproject.toml#L62

We require typing-extensions >= 4.6.1 which included this addition.

I have typing-extensions 4.7.1. In the link which you sent, I see pydantic-core 2.2.0, but pydantic 2.0.2 requires pydantic-core 2.1.2. I don't know if this could be related.

ps.: Should I move this thread to an issue in Pydantic repo?

Thanks