No first-class bound method support
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bug
- Dominant language
- Python
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Description
class X:
def f(self) -> None:
pass
reveal_type(X().f)
reveal_type(X().f.__self__)
I'd expect X().f to be some Callable derived generic type for bound methods.
I'd expect X().f.__self__ to be typed X. Currently __self__ is defined in the typeshed for types.MethodType as returning object.
Playground: https://mypy-play.net/?mypy=latest&python=3.11&gist=0de8d7a90f1d3770b3b600052c1671b1
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 by reproducing the two reveal_type results in the linked mypy playground and compare them with the expected bound-method and self types. Done means bound methods have an appropriate generic Callable-derived type and self is inferred as X rather than object.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- devtools
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100