no error when subtyping string literal
Open
Nobody has claimed this yet.
bug
priority-2-low
topic-runtime-semantics
- Dominant language
- Python
- Stars
- 20.6k
- Forks
- 3.3k
- PR merge metrics
- PR metrics pending
Description
class Foo:
pass
class Bar("Foo"): # no error, crashes at runtime
pass
TypeError: str() argument 'encoding' must be str, not tuple
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
Run the linked mypy playground with the provided Python example and confirm that the string literal used as a base class is accepted during type checking. The issue is done when this example produces a type-checking diagnostic instead of reaching the runtime TypeError.
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
- Clearly specified
- Newbie friendliness
- 45/100