IntOrStr = int | str

x = 0

assert isinstance(x, IntOrStr)  # works

match x:
    case IntOrStr():  # E: "called match pattern must be a type"
        print(f"x is an int or str: {x}")

from typing import NamedTuple

class ColorName(NamedTuple):
    name: str

class RGB(NamedTuple):
    r: int
    g: int
    b: int

Color = ColorName | RGB

def f(color: Color): ...

c: Color = RGB(0, 255, 128)

def g(color: Color | str):
    match c:
        case Color():
            f(c)
        case str():
            f(ColorName(c))