解释 __dict__ 属性 [英] Explain __dict__ attribute

问题描述

我真的对 __dict__ 属性感到困惑.我已经搜索了很多，但仍然不确定输出.

如果在对象、类或函数中使用此属性，有人可以从零开始解释它的使用吗?

解决方案

基本上它包含了描述相关对象的所有属性.它可用于更改或读取属性.引用 __dict__ 的文档><块引用>

用于存储对象(可写)属性的字典或其他映射对象.

请记住，在 Python 中一切都是对象.当我说一切时，我的意思是所有的东西，比如函数、类、对象等(是的，你没看错，类.类也是对象).例如:

def func():经过func.temp = 1打印(func.__dict__)类 TempClass:一 = 1def temp_function(self):经过打印(TempClass.__dict__)

会输出

{'temp': 1}{'__module__': '__main__','一':1，'temp_function':<函数 TempClass.temp_function at 0x10a3a2950>，'__dict__':<'TempClass' 对象的属性 '__dict__'，'__weakref__':<'TempClass' 对象的属性 '__weakref__'，'__doc__':无}

I am really confused about the __dict__ attribute. I have searched a lot but still I am not sure about the output.

Could someone explain the use of this attribute from zero, in cases when it is used in a object, a class, or a function?

解决方案

Basically it contains all the attributes which describe the object in question. It can be used to alter or read the attributes. Quoting from the documentation for __dict__

A dictionary or other mapping object used to store an object's (writable) attributes.

Remember, everything is an object in Python. When I say everything, I mean everything like functions, classes, objects etc (Ya you read it right, classes. Classes are also objects). For example:

def func():
    pass

func.temp = 1

print(func.__dict__)

class TempClass:
    a = 1
    def temp_function(self):
        pass

print(TempClass.__dict__)

will output

{'temp': 1}
{'__module__': '__main__', 
 'a': 1, 
 'temp_function': <function TempClass.temp_function at 0x10a3a2950>, 
 '__dict__': <attribute '__dict__' of 'TempClass' objects>, 
 '__weakref__': <attribute '__weakref__' of 'TempClass' objects>, 
 '__doc__': None}

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