python--built-in properties

I. Common built-in properties

help (class or instance) The class All parent classes of the The

Common proprietary Properties	Description	Trigger Mode
__init__	construct initialization function	After creating an instance, when assigning values, after __new__
__new__	Build instance required properties	Create instance
__class__	instance where the td> instance resides. __class__
__str__	Instance string representation, readability	print (class instance), using REPR results if not implemented
__repr__	Instance string representation, accuracy	class instance carriage return or print (Repr (class instance))
__del__	destructor	del Delete instance
__dict__	instance from Define Property	VARs (instance. __dict__)
__doc__	class document, subclass does not inherit
__getattribute__	Property Access interceptors	Access instance Properties
__bases__	class constitute elements	class name. __bases__

1. Use of property interceptors

classItcast (object):def __init__(Self,subject1): Self.subject1=Subject1 Self.subject2='CPP'    #property Access when the Interceptor, hit log    def __getattribute__(self,obj):ifobj = ='Subject1':            Print('Log Subject1')            return 'redirect Python'        Else:#comment out these 2 lines when testing, will not find Subject2            returnObject.__getattribute__(self,obj)defShow (self):Print('This is itcast') s= Itcast ("python")Print(S.subject1)Print(S.SUBJECT2)#ResultsLog Subject1redirect pythoncpp

use of property interceptors

python--built-in properties