python-attrs / python-attrs/attrs
Type annotation for attr.ib wrappers functions
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Bug
Typing
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- Python
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Description
It's possible to type a method that wraps an attr.ib attribute?
Example:
import attr
from typing import Any
def typed() -> Any:
return attr.ib(type=str)
@attr.s
class TestingParams:
foo = attr.ib(type=str)
acme = typed()
TestingParams(foo='1', acme='3')
Executing mypy (0.812) with Python (3.7.3) and attrs (20.3.0) I got the following output
error: Unexpected keyword argument "acme" for "TestingParams" [call-arg]
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
Reproduce the example with mypy 0.812, Python 3.7.3, and attrs 20.3.0, focusing on the unexpected keyword argument for the wrapped attribute. Then inspect the attrs typing integration and determine what support is needed; done means the example type-checks without the acme error.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- developer-experience
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100