(🐞) double partial handled incorrectly
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bug
- Dominant language
- Python
- Stars
- 20.6k
- Forks
- 3.3k
- PR merge metrics
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Description
a = None
a = []
a.append("")
a = None # incompatible, expected list[str], found None
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
The issue provides only a Python reproducer and names no files or tests. Start by running the snippet through mypy and tracing the partial-type handling that produces the diagnostic. Before changing behavior, establish the intended result for the second assignment and add a focused regression test showing the corrected diagnostic.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- tooling
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 32/100