from typing import *
from abc import ABC
class EmptyTypedDict(TypedDict):
 pass
DictT = TypeVar("DictT", bound=TypedDict, default=EmptyTypedDict)
class MyClass(ABC, Generic[DictT]):
 @abstractmethod
 def my_func_inner(self, **extra: Unpack[DictT]): ...
 def my_func(self, arg: int, **extra: Unpack[DictT]):
 print(f"Arg: {arg}, extra: {extra}")
 return self.my_func_inner(self, **extra)
class SubExtra(TypedDict):
 x: int
 y: str
class MyClassSub(MyClass[SubExtra]):
 def my_func_inner(self, *, x: int, y: str):
 print(f"x = {x}, y = {y}")