Python---__getattr__\__setattr_ overloaded '. ' Operation

#!coding:utf-8classPerson (object):def __init__(self,id):#to define a property named IDSelf.id=IDdef __getattr__(self,attr):#__getattr__ used to overload an object instance '. ' operator,        #if the property called by the. Operator is present, return the property directly; otherwise call __getattr__ to return        Print 'In __getattr__'        ifattr=='Name':            return 'My name is Hello world'        Else:            Raiseattributeerror,attrdef __setattr__(self,attr,value):ifattr=='Name':            #Note that this time cannot be directly assigned to a property, or it is a dead loop.Self.__dict__[attr]=valueElse:            Raiseattributeerror,attr+'Not find'if __name__=='__main__': P=person ('007')    Printp.idPrintP.name#__getattr__ is called here because the instance does not register the name attribute. P.a=1#sets an unknown property, which throws an exception. 

Python---__getattr__\__setattr_ overloaded '. ' Operation