[case testTypeVarMappingBound]
# Dicts are special-cased for efficient iteration.
from typing import Dict, TypedDict, TypeVar, Union

class TD(TypedDict):
    foo: int

M = TypeVar("M", bound=Dict[str, int])
U = TypeVar("U", bound=Union[Dict[str, int], Dict[str, str]])
T = TypeVar("T", bound=TD)

def fn_mapping(m: M) -> None:
    print([x for x in m])
    print([x for x in m.values()])
    print([x for x in m.keys()])
    print({k: v for k, v in m.items()})

def fn_union(m: U) -> None:
    print([x for x in m])
    print([x for x in m.values()])
    print([x for x in m.keys()])
    print({k: v for k, v in m.items()})

def fn_typeddict(t: T) -> None:
    print([x for x in t])
    print([x for x in t.values()])
    print([x for x in t.keys()])
    print({k: v for k, v in t.items()})

def test_mapping() -> None:
    fn_mapping({})
    print("=====")
    fn_mapping({"a": 1, "b": 2})
    print("=====")

    fn_union({"a": 1, "b": 2})
    print("=====")
    fn_union({"a": "1", "b": "2"})
    print("=====")

    orig: Union[Dict[str, int], Dict[str, str]] = {"a": 1, "b": 2}
    fn_union(orig)
    print("=====")

    td: TD = {"foo": 1}
    fn_typeddict(td)
[typing fixtures/typing-full.pyi]
[out]
\[]
\[]
\[]
{}
=====
\['a', 'b']
\[1, 2]
\['a', 'b']
{'a': 1, 'b': 2}
=====
\['a', 'b']
\[1, 2]
\['a', 'b']
{'a': 1, 'b': 2}
=====
\['a', 'b']
\['1', '2']
\['a', 'b']
{'a': '1', 'b': '2'}
=====
\['a', 'b']
\[1, 2]
\['a', 'b']
{'a': 1, 'b': 2}
=====
\['foo']
\[1]
\['foo']
{'foo': 1}

[case testParamSpecComponentsAreUsable]
from typing import Callable
from typing_extensions import ParamSpec

P = ParamSpec("P")

def deco(func: Callable[P, int]) -> Callable[P, int]:
    def inner(*args: P.args, **kwargs: P.kwargs) -> int:
        print([x for x in args])
        print({k: v for k, v in kwargs.items()})
        print(list(kwargs))
        print(list(kwargs.keys()))
        print(list(kwargs.values()))
        return func(*args, **kwargs)

    return inner

@deco
def f(x: int, y: str) -> int:
    return x

def test_usable() -> None:
    assert f(1, 'a') == 1
    assert f(2, y='b') == 2
[out]
\[1, 'a']
{}
\[]
\[]
\[]
\[2]
{'y': 'b'}
\['y']
\['y']
\['b']