Mypy doesn't assign TypedDict output as Literals
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Description
Bug Report
(A clear and concise description of what the bug is.)
To Reproduce
When I do this, I get an error saying a literal is required. When I add a literal it can't assign a string to a literal.
Actual Behavior
When using the first way, I got this error:
main.py:19: error: TypedDict key must be a string literal; expected one of ("b", "c", "d") [literal-required]
Found 1 error in 1 file (checked 1 source file)
The second way this one:
main.py:19: error: Incompatible types in assignment (expression has type "str", variable has type "Literal['b', 'c', 'd']") [assignment]
Found 1 error in 1 file (checked 1 source file)
Your Environment
I used the standard strict configuration from vscode, I don't know where I could find the version info and default command-line flags.
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 two linked mypy-play reproductions and compare their TypedDict and Literal behavior under the reported Python 3.11/latest setup. Done means both examples type-check as intended without the reported literal-required or incompatible-assignment errors.
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
- 45/100