microsoft / microsoft/pyright

`override` decorator doesn't report problems when paired with `cached_property` decorator

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#11,130 2 comments 0 reactions 0 assignees View on GitHub
enhancement request
Dominant language
Python
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Description

Pyright doesn't report a problem for a method decorated with `cached_property` and `override` in a class even if no such method exists in the base class. Is this intended behaviour?

```python
from functools import cached_property
from typing import override

class A:
pass

class B(A):
@cached_property
@override
def should_override(self) -> int: # Should report a problem
return 0
```

Pylance 2025.9.1
Pyright 1.1.406

Contributor guide

Open the contributing guide

Research direction

Start with the minimal Python example in the issue and run it through Pyright 1.1.406 to reproduce the missing diagnostic. Trace how Pyright handles `override` when it is paired with `functools.cached_property`; done means reporting that `should_override` has no matching member in base class A.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
devtools
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
45/100

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