no error when using `field` outside of a `dataclass`
Open
Nobody has claimed this yet.
feature
priority-2-low
topic-dataclasses
- Dominant language
- Python
- Stars
- 20.6k
- Forks
- 3.3k
- PR merge metrics
- PR metrics pending
Description
from dataclasses import field
a = field(default=1)
a + 1 # runtime error
reveal_type(a) # int
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 issue with the Python snippet or linked mypy playground, then trace how dataclasses.field is analyzed outside a dataclass context. Done means mypy reports the invalid use instead of accepting a value that runtime treats as a field object, while preserving valid dataclass usage.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- compilers, devtools
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100