_multiplay_metadata.json

{"version": 1, "file_mapping": {"main.py": "main.py", "pyproject.toml": "pyproject.toml"}}

main.py

from typing import reveal_type
x: list[int] = list()

y: list[int | None] = [None] * len(x)  # Object of type `list[None]` is not assignable to `list[int | None]` (invalid-assignment)
z: list[int | None] = [None]  # OK


def func() -> list[int | None]:
    if ...:
        return [None] * len(x) # Return type does not match returned value: expected `list[int | None]`, found `list[None]` (invalid-return-type)
    else:
        return [None]  # OK

def func2(x: list[int | None]):
    ...

func2([None] * len(x)) # Argument to function `func` is incorrect: Expected `list[int | None]`, found `list[None]` (invalid-argument-type)
func2(reveal_type([None]))  # OK  (Revealed type: `list[int | None]`)

pyproject.toml

[project]
name = "sandbox"
version = "0.1.0"
requires-python = ">=3.10"
dependencies = []


[tool.ty]
[tool.ty.rules]
undefined-reveal = "ignore"


[tool.mypy]
color_output = true
pretty = true
check_untyped_defs = true


[tool.pyright]
reportWildcardImportFromLibrary = false
reportSelfClsParameterName = false
reportUnusedExpression = false


[tool.zuban]
pretty = true
check_untyped_defs = true


[tool.pycroscope]
import_paths = ["."]


[tool.pyrefly]