python-attrs / python-attrs/attrs
Adding runtime_checkable to AttrsInstance
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Description
Is it possible to add the runtime_checkable decorator to AttrsInstance protocol?
In my project, I am working on a decorator that automates converting a dict into an AttrsInstance.
To perform reflection checks on input definitions, I found myself needing to subclass AttrsInstance without modifying it—just to add the runtime_checkable decorator.
It would be incredibly helpful if the attrs library's definition already included runtime_checkable.
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
Read src/attr/init.py at lines 37-38, where AttrsInstance is defined. Add the requested runtime_checkable support and verify that callers can perform runtime checks on AttrsInstance without subclassing it.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- tooling
- Issue type
- Feature
- Difficulty
- 1/5
- Estimated time
- 1-3 hours
- Activity status
- Stale
- Clarity
- Clearly specified
- Newbie friendliness
- 35/100