Прочети кода внимателно

from typing import Protocol, runtime_checkable


@runtime_checkable
class Sized(Protocol):
    def __len__(self) -> int: ...


class Bag:
    def __init__(self, items: list) -> None:
        self._items = items

    def __len__(self) -> int:
        return len(self._items)


class Empty:
    pass


class FakeSized:
    __len__ = "not actually a method"


print(isinstance(Bag([1, 2, 3]), Sized))
print(isinstance(Empty(), Sized))
print(isinstance([1, 2], Sized))
print(isinstance("hello", Sized))
print(isinstance(42, Sized))
print(isinstance(FakeSized(), Sized))

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