(🐞) Variable in dataclass body has value of type `Field` when mypy thinks it's `int` (or whatever)
Open
Nobody has claimed this yet.
bug
priority-2-low
topic-dataclasses
- Dominant language
- Python
- Stars
- 20.6k
- Forks
- 3.3k
- PR merge metrics
- PR metrics pending
Description
from dataclasses import dataclass, field
@dataclass
class A:
a: int = field(default=1)
print(a + 1)
- related #13120
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 provided dataclasses reproducer and run mypy on it to confirm the mismatch between the annotated int and the runtime Field value. Trace the dataclass handling that determines the type of names used in the class body, then add a regression test for this example. Done means the checker reports the class-body operation consistently with the runtime value.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- devtools
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100