Why not something like:


from typing import Any, Generic, Mapping, TypeVar, TypedDict, cast

T = TypeVar("T", bound=Mapping[str, Any])

class Item(Generic[T]):
    def __init__(self) -> None:
        self.stash: T = cast(T, {})

class MyStash(TypedDict):
    my_plugin_attr: int

def pytest_runtest_setup(item: Item[MyStash]) -> None:
    item.stash["my_plugin_attr"] = 8

def pytest_runtest_teardown(item: Item[MyStash]) -> None:
    print(item.stash["my_plugin_attr"])
    # Maybe
    del item.stash["my_plugin_attr"]  # type error here because the key is required


This works in both pyright and mypy.
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