python类动态属性，以属性方式访问字典

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=None
        self.sampleid=None
        self.mass=None
        self.beizhu=""
        self.num=0
        self.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  v
        return 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]=value
            else:
                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