从标准库向 Python 字典添加属性

2022-01-13 00:00:00 python dictionary attributes

问题描述

我想知道是否可以向 Python 字典添加属性?

I was wondering if you could add an attribute to a Python dictionary?

class myclass():
    def __init__(): 
     self.mydict = {}  # initialize a regular dict
     self.mydict.newattribute = "A description of what this dictionary will hold"
     >>> AttributeError: 'dict' object has no attribute 'newattribute'
     setattr(self.mydict, "attribute", "A description of what this dictionary will hold"
     >>> AttributeError: 'dict' object has no attribute 'newattribute'

有没有办法快速添加我的描述属性，而不必复制 dict 类和重载构造函数.我以为这很简单，但我想我错了.

Is there anyway to quickly add my description attribute without having to copy the dict class and overloading the constructor. I thought it would be simple, but I guess I was wrong.

解决方案

直接派生自dict:

class MyDict(dict):
    pass

MyDict 实例的行为类似于 dict，但可以具有自定义属性:

Instances of MyDict behave like a dict, but can have custom attributes:

>>> d = MyDict()
>>> d.my_attr = "whatever"
>>> d.my_attr
'whatever'

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