from typing import TypedDict

class MyTypedDict1(TypedDict):
    aaa: int
    bbb: int


class MyTypedDict2(TypedDict):
    aaa: int
    bbb: int
    ccc: int

d1: MyTypedDict1 = {
    "aaa": 1,
    "bbb": 2,
}

d2: MyTypedDict2 = {
    **d1,
    "ccc": 3,
}