[issue45121] Regression in 3.9.7 with typing.Protocol

Change by Jelle Zijlstra : -- nosy: +Jelle Zijlstra, kj ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe: https

[issue45121] Regression in 3.9.7 with typing.Protocol

Eric V. Smith added the comment: Sorry I didn't notice your reference to issue 45081. -- ___ Python tracker ___ ___ Python-bugs-lis

[issue45121] Regression in 3.9.7 with typing.Protocol

Change by Yurii Karabas <1998uri...@gmail.com>: -- keywords: +patch nosy: +uriyyo nosy_count: 3.0 -> 4.0 pull_requests: +26630 stage: -> patch review pull_request: https://github.com/python/cpython/pull/28206 ___ Python tracker

[issue45121] Regression in 3.9.7 with typing.Protocol

Shantanu added the comment: Sorry if my message was confusing. Hopefully the following makes things clear: 3.9.6: snippet runs without error 3.9.7, with bpo-44806: (a probably reasonable) TypeError, but a breaking change main, with bpo-45081: RecursionError -- _

[issue45121] Regression in 3.9.7 with typing.Protocol

Shantanu added the comment: As I mentioned in the post, bpo-45081 actually makes this issue worse, since we get a RecursionError. I think `TypeError: Protocols cannot be instantiated` is probably okay behaviour (as opposed to RecursionError), more just unfortunate that it seems to be an una

[issue45121] Regression in 3.9.7 with typing.Protocol

Eric V. Smith added the comment: Possibly related to issue 45081, which ended up not having anything to do with dataclasses (despite the title). Can you check if that fix solves your problem? -- nosy: +eric.smith ___ Python tracker

[issue45121] Regression in 3.9.7 with typing.Protocol

Change by Shantanu : -- nosy: +lukasz.langa ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.pyth

[issue45121] Regression in 3.9.7 with typing.Protocol

New submission from Shantanu : Consider: ``` from typing import Protocol class P(Protocol): ... class C(P): def __init__(self): super().__init__() C() ``` This code passes without error on 3.9.6. With 3.9.7, we get: ``` Traceback (most recent call last): File "/Users/shanta