type of variable not narrowed after `continue` statement inside `try`/`except` block inside a for loop inside a function
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Nobody has claimed this yet.
bug
topic-type-narrowing
- Dominant language
- Python
- Stars
- 20.6k
- Forks
- 3.3k
- PR merge metrics
- PR metrics pending
Description
def _() -> None:
for value in [1,2]:
try:
foo = 1
except Exception:
foo = None
continue
reveal_type(foo) # `int | None`, should be `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
Start by reproducing the example in the linked mypy playground and inspect the control-flow type narrowing around the for loop, try/except, and continue statement. Add a regression test for this case; done means reveal_type(foo) is reported as int after the try/except block.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100