traitlets.Set should support generic type annotations for type safety
Nobody has claimed this yet.
Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 45/100
Research direction
Start in traitlets/traitlets.py at the Set container trait implementation and inspect how its type parameters could correspond to the annotated element type. Done means Set accepts annotations such as Set[str] and Set[int] while preserving the existing default-value behavior; the issue does not name a test file or test entry point.
Written by the indexing model from the issue text.
Description
Problem
traitlets.Set currently lacks generic type support, making it impossible to specify the type of elements it contains for proper type checking.
Current Situation
from traitlets import Set
import traitlets
class MyClass(traitlets.HasTraits):
# This works but provides no type information
my_set = Set()
# This doesn't work - no generic support
# my_set: Set[str] = Set() # Type error
Desired Behavior
traitlets.Set should support generic type annotations similar to how Python's built-in collections work:
from traitlets import Set
import traitlets
class MyClass(traitlets.HasTraits):
# Should be possible for type safety
room_ids: Set[str] = Set()
numbers: Set[int] = Set(default_value={1, 2, 3})
Reference
The Set class is implemented in traitlets/traitlets.py as a container trait.
- Dominant language
- Python
- Stars
- 653
- Forks
- 217
- Avg merge
- 2d 21h
- Merged PRs (30d)
- 2
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.
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