object当中有什么？

class classname(object):
    """
    docstring
    """
    pass

class object:
    __doc__: str | None
    __dict__: dict[str, Any]
    __module__: str
    __annotations__: dict[str, Any]
    @property
    def __class__(self) -> type[Self]: ...
    # Ignore errors about type mismatch between property getter and setter
    @__class__.setter
    def __class__(self, __type: type[object]) -> None: ...  # noqa: F811
    def __init__(self) -> None: ...
    def __new__(cls) -> Self: ...
    # N.B. `object.__setattr__` and `object.__delattr__` are heavily special-cased by type checkers.
    # Overriding them in subclasses has different semantics, even if the override has an identical signature.
    def __setattr__(self, __name: str, __value: Any) -> None: ...
    def __delattr__(self, __name: str) -> None: ...
    def __eq__(self, __value: object) -> bool: ...
    def __ne__(self, __value: object) -> bool: ...
    def __str__(self) -> str: ...  # noqa: Y029
    def __repr__(self) -> str: ...  # noqa: Y029
    def __hash__(self) -> int: ...
    def __format__(self, __format_spec: str) -> str: ...
    def __getattribute__(self, __name: str) -> Any: ...
    def __sizeof__(self) -> int: ...
    # return type of pickle methods is rather hard to express in the current type system
    # see #6661 and https://docs.python.org/3/library/pickle.html#object.__reduce__
    def __reduce__(self) -> str | tuple[Any, ...]: ...
    if sys.version_info >= (3, 8):
        def __reduce_ex__(self, __protocol: SupportsIndex) -> str | tuple[Any, ...]: ...
    else:
        def __reduce_ex__(self, __protocol: int) -> str | tuple[Any, ...]: ...
    if sys.version_info >= (3, 11):
        def __getstate__(self) -> object: ...

    def __dir__(self) -> Iterable[str]: ...
    def __init_subclass__(cls) -> None: ...
    @classmethod
    def __subclasshook__(cls, __subclass: type) -> bool: ...

`doc: str | None`

__doc__方法是python内置方法之一，该方法通常会返回指定对象中的注释部分：

 
class ClassName:
   '''
   这个是我定义的类的注释
    '''
   def __init__(self):
    '''
    这是一个类属性
    '''
index = ClassName()
print(index.__doc__)
print(index.__init__.__doc__)

`dict: dict[str, Any]`

__dict__属性在不同的地方有不同的使用：

类__dict__属性：包括静态函数、普通函数、类函数或者全局变量、一些内置属性
类对象__dict__属性：存储了一些self.xxx的一些东西，其中父类与子类对象共用__dict__
在字典中是一个字典里面存放的数据
一些内置数据类型是没有__dict__属性的。比如int、list、dict等这些数据类型
继承的时候__dict__属性中每个类的类变量，函数名都放在自己的__dict__中，实例变量的__dict__中父类和子类对象的__dict__是公用的