# Instead of
# def f(list: List[Union[int, str]], param: Optional[int]) -> Union[float, str]
def f(list: List[int | str], param: int | None) -> float | str:
    pass

f([1, "abc"], None)

# Instead of typing.List[typing.Union[str, int]]
typing.List[str | int]
list[str | int]

# Instead of typing.Dict[str, typing.Union[int, float]]
typing.Dict[str, int | float]
dict[str, int | float]