动态属性能够用来描述变化的类，在实际应用中容易遇到用到。

import logging
class Sample:def __init__(self):self.time=Noneself.sampleid=Noneself.mass=Noneself.beizhu=""self.num=0self.items={}#字典属性def __getattribute__(self, attr): #注意：attr是传入的属性名,不是属性值# print(attr)if attr!="items":   v=self.items.get(attr)if v!=None:return  vreturn object.__getattribute__(self, attr) #返回属性def __setattr__(self, attr,value): #注意：attr是传入的属性名,不是属性值# print([attr,value])# print(attr)# print(dir(self))if attr!="items": # print(dir(self))if hasattr(self, "items") and self.items.get(attr)!=None:self.items[attr]=valueelse:return object.__setattr__(self, attr,value)    else:return object.__setattr__(self, attr,value)if __name__=="__main__":s=Sample()s.sampleid="001"s.items={"a":"a","b":"b"}print(s.sampleid,s.a,s.b)s.a="a2"print(s.sampleid,s.a,s.b)

运行演示： 

D:\ma\python\report__stand2\simple>python s1.py
001 a b
001 a2 b