来自https://docs.python.org/3.3/library/functions.html#object
object
does not have a__dict__
, so you can’t assign arbitrary attributes to an instance of theobject
class.
为什么“object
没有__dict__
”?
对我有用
>>> object.__dict__
mappingproxy({'__repr__': <slot wrapper '__repr__' of 'object' objects>, '__hash__': <slot wrapper '__hash__' of 'object' objects>, '__subclasshook__': <method '__subclasshook__' of 'object' objects>, '__ne__': <slot wrapper '__ne__' of 'object' objects>, '__format__': <method '__format__' of 'object' objects>, '__new__': <built-in method __new__ of type object at 0xa3dc20>, '__doc__': 'The most base type', '__class__': <attribute '__class__' of 'object' objects>, '__dir__': <method '__dir__' of 'object' objects>, '__delattr__': <slot wrapper '__delattr__' of 'object' objects>, '__getattribute__': <slot wrapper '__getattribute__' of 'object' objects>, '__le__': <slot wrapper '__le__' of 'object' objects>, '__init__': <slot wrapper '__init__' of 'object' objects>, '__gt__': <slot wrapper '__gt__' of 'object' objects>, '__ge__': <slot wrapper '__ge__' of 'object' objects>, '__eq__': <slot wrapper '__eq__' of 'object' objects>, '__reduce__': <method '__reduce__' of 'object' objects>, '__lt__': <slot wrapper '__lt__' of 'object' objects>, '__str__': <slot wrapper '__str__' of 'object' objects>, '__reduce_ex__': <method '__reduce_ex__' of 'object' objects>, '__sizeof__': <method '__sizeof__' of 'object' objects>, '__setattr__': <slot wrapper '__setattr__' of 'object' objects>})
为什么“不能为object
类的实例分配任意属性”?在
您将类型上的
__dict__
与实例上的属性混淆。object()
实例没有__dict__
属性:请注意,自定义Python类实例的}不存在。在
__dict__
属性是descriptor;实例本身没有该属性,而是提供该属性的类(因此返回type(instance).__dict__['__dict__'].__get__(instance)
)。object.__dict__
可能存在,但{object()
不支持实例属性,因为它是所有自定义Python类的基础,必须是support not having a ^{相关问题 更多 >
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