Pylance 2022.6.10 no longer allows Enum with another mixed-in type

[mikeyk]

Environment data

• Language Server version: 2022.6.10
• OS and version: darwin arm64
• Python version (and distribution if applicable, e.g. Anaconda): Python 3.10 virtual env
• python.analysis.indexing: null
• python.analysis.typeCheckingMode: basic

Code Snippet

from enum import Enum

class StrEnum(str, Enum):
  HELLO = "hello"
  OK = "ok"

Note that this is the order suggested by the Python docs.

Expected behavior

No pylance warning given for snippet above.

Actual behavior

As of the 2022.6.10 release, this now reports:

The metaclass of a derived class must be a subclass of the metaclasses of all its base classes

2022.6.11 pre-release exhibits the same issue. This previously worked in 2022.6.0.

[erictraut]

I'm not able to repro the problem, and I can't think of any reason why this behavior would have changed recently.

Is it possible that you have a custom enum module or stub installed? If you right click on Enum and choose "Go to Declaration", where does it take you?

[mikeyk]

Ah, that was exactly it @erictraut; our local version of typeshed had worked until the latest Pylance update and then the combination started showing that metaclass error; updating typeshed definitions fixes the issue on latest Pylance. Thank you!