`property` accessed on class incorrectly understood as function, expected `property`
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bug
topic-descriptors
- Dominant language
- Python
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Description
class Foo:
@property
def foo(self) -> int:
return 1
reveal_type(foo) # Revealed type is "def (self: asdf.Foo) -> int"
reveal_type(Foo.foo) # Revealed type is "def (self: asdf.Foo) -> int"
related: https://github.com/python/mypy/issues/15911#issuecomment-1685167054
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the Foo reproducer in the issue and compare its two reveal_type results with the related discussion in mypy issue 15911. Trace how mypy interprets the @property declaration when accessed through the class, and consider the work complete when Foo.foo is revealed as a property rather than a function while instance access remains correct.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Clearly specified
- Newbie friendliness
- 35/100