list of dict is reported as not compatible with list of Mapping

[Czaki]

Bug Report

Then have a function that returns a list of dicts and assigns it to a variable annotated as list of Mapping the mypy reports error, however when change annotation to Sequence[Mapping] it works.

To Reproduce

Code that generates mypy warning

from collections.abc import Mapping, Sequence


def get_dkt() -> list[dict]:
    return [{}]
    
var2: list[Mapping]

var2 = get_dkt()

code that do not generate error:

from collections.abc import Mapping, Sequence


def get_dkt() -> list[dict]:
    return [{}]
    
var2: Sequence[Mapping]

var2 = get_dkt()

https://mypy-play.net/?mypy=latest&python=3.12&gist=a3a7cf085ceed0a395392a6adaa74a29

Expected Behavior

Both presented type annotation above should work.

Actual Behavior

Your Environment

• Mypy version used: 1.11.2
• Python version used: 3.12

[JelleZijlstra]

https://mypy.readthedocs.io/en/stable/common_issues.html#invariance-vs-covariance