请考虑以下设置：
MutableSequence，该通用__init__可以在其MutableSequence中定义如何访问某些键属性以在运行时执行一致性检查（例如：在class UniqueKeyedList(MutableSequence[T], collections.abc.MutableSequence):
"""A mutable sequence that maintains uniqueness of a key-property accessible through a determined selector function.
Args:
contents (Collection[T]): A collection of items to initialise the `UniqueKeyedList` with.
key_getter (Callable[[T], Hashable]): Getter function to access key properties of `contents` items.
Raises:
ValueError: Raised if the input `contents` do not fulfill the uniqueness of keys property.
"""
def __init__(self, contents: Collection[T], *, key_getter=Callable[[T], Hashable]):
if not _fulfills_uniqueness_property(values=contents, key_getter=key_getter):
raise ValueError("Collection must not contain multiple entries with same key.")
self._contents = list(contents)
self._key = key_getter
# other implementations for abstract methods here
中强制键属性的唯一性）UniqueKeyedListkey_getter子类化UniqueKeyedList，并要求key_getter中的所有项目必须实现一个接口，以确保class IDIdentifiable(ABC):
"""Interface for objects implementing an `id_` property returning a hashable value.
"""
@property
@abstractmethod
def id_(self) -> Hashable:
raise NotImplementedError
class IDUniqueItemList(UniqueKeyedList[IDIdentifiable]):
"""`UniqueKeyedList` composed of `IDIdentifiable` objects.
Args:
args (Collection[IDIdentifiable]): A collection of `IDIdentifiable` objects to initialise the unique item list
with.
Raises:
ValueError: Raised if any operation violates the unique key constraint.
"""
def __init__(self, args: Collection[IDIdentifiable]):
super().__init__(args, key_getter=lambda x: x.id_)
始终访问现有属性：< / li>
IDUniqueItemList 目标：我想将IDUniqueItemList[MyClassImplementingIDIdentifiable]保留为通用类，以便为存储在其中的各个元素设置类型提示（例如IDUniqueItemList）。但是，我不能仅仅使TypeVar通用而不能强制我使用的IDIdentifiable实现IDIdentifiable。使IDUniqueItemList通用似乎是错误的。
如何最好地实现这样的设置，以保持子类{{1}}的通用性？