从标准库向python字典添加属性

Question

我想知道你是否可以在python字典中添加一个属性.

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'

无论如何都要快速添加我的描述属性,而不必复制dict类并重载构造函数.我觉得这很简单,但我想我错了.

谢谢,J

Answer 1

只是来自dict:

class MyDict(dict):
    pass

实例MyDict可以具有自定义属性:

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