Parameters for a TypedDict don't show type on hover

[rchiodo]

Note: if you are reporting a wrong signature of a function or a class in the standard library, then the typeshed tracker is better suited for this report: https://github.com/python/typeshed/issues.

Describe the bug
Hover for TypedDicts init does not compute the type

To Reproduce
Steps to reproduce the behavior.

VS Code extension or command-line
VS Code Extension

Additional context
Add any other context about the problem here.

[erictraut]

@rchiodo, can you please paste the code in text form? It's inconvenient to retype from a screen shot.

[tuchandra]

I don't think your code is correct. TypedDict is not initialized like a class, even though it looks like one. This is completely wrong, thanks Eric.

The below should work and autocomplete/hover correctly—

y: Movie2 = {"name": "foo", "year": 4}

# alternative
y: Movie2 = dict(name="foo", year=4)

[erictraut]

@tuchandra, the constructor call in the screen shot above is legal for a TypedDict. The two forms you provided are also supported.

[erictraut]

Here's the code in text form:

from typing import TypedDict

class Movie2(TypedDict):
    name: str
    year: int

y = Movie2(name='foo', year=4)

print(y['name'])

[erictraut]

I agree that the hover text in this case could be improved. Since this is a language server issue, not a core type-checking issue, I'm going to transfer it to pylance-release.

[erictraut]

This will be addressed in the next release of pyright and a future release of pylance.

[rchiodo]

This issue has been fixed in prerelease version 2022.11.21, which we've just released. You can find the changelog here: CHANGELOG.md