Methods for object-oriented private properties (plus two underscores) the difference between modern class classic classes

@classmetod

#!/usr/bin/env python#-*-coding:utf-8-*-class Animal:    def __init__ (self,name):        self.name = name    Hobbie = The ' meat '    @classmethod   #类方法不能访问实例变量  plus  self.name can't access def Talk    (self):        #print ("%s is Talking "%self.name)        print ("%s is Talking "%self.hobbie) Animal.hobbieAnimal.talk () d = Animal (" Wangwang ") D.talk ()

　　

@staticmethon

#!/usr/bin/env python#-*-coding:utf-8-*-class Animal:    def __init__ (self,name):        self.name = name    Hobbie = ' Meat '    @classmethod   #类方法不能访问实例变量  Self.name will not be able to access    def talk (self):        #print ("%s is Talking "%self.name"        print ("%s is Talking"%self.hobbie) "    @staticmethod   #静态方法, it has nothing to do with the case, instance variables and class variables are inaccessible,    def Walk ():        print ("is walking ...") #Animal. Hobbie#animal.talk () d = Animal ("Wangwang") D.walk ()

　　

@property

#!/usr/bin/env python#-*-coding:utf-8-*-class animal:def __init__ (self,name): Self.name = name SELF.N Um = None Hobbie = ' meat ' @classmethod #类方法不能访问实例变量 self.name cannot access def talk (self): #print ("%s I S talking "%self.name) print ("%s is Talking "%self.hobbie) @staticmethod #静态方法 with no relation to the case, instance variables and class variables are inaccessible, D    EF Walk (): Print ("is walking ...") @property #加了property后babit就不是方法了, when used without parentheses, is a property. The class variable instance variable can also be accessed by turning the method into a property. The value cannot be passed. If you do not want to pass the value to see the following example, delete also under Def habit (self): print ("[%s] habit is Xxoo"%self.name) #往里面传值 @property def total_p        Layers (self): return self.num @total_players. Setter def total_players (self,num): Self.num = num Print ("Total players:", Self.num) #删值 @total_players. Deleter def total_players (self): print ("Total player Got Delted ") del Self.num#animal.hobbie#animal.talk () # d = Animal (" Wangwang ") # D.walk () d = Animal (" Wangwang ") D.habi Tprint (D.total_players) d.total_players = 3del D.total_playersprint (d.total_players) 

Private variable (private property)) is not accessible outside, if special circumstances are not to access it is also possible

Print ("Out__num:", d.__num) changed to print ("Out__num:", D._animal__num)

#!/usr/bin/env python#-*-coding:utf-8-*-class animal:def __init__ (self,name): Self.name = name Self._  _num = None Hobbie = ' meat ' @classmethod #类方法不能访问实例变量 self.name cannot access def talk (self): #print ("%s    Is talking '%self.name ' Print ("%s is Talking"%self.hobbie) @staticmethod #静态方法, has nothing to do with the case, the instance variables and class variables are inaccessible,    Def walk (): Print ("is walking ...") @property after #加了property Babit is not a method, it is a property. The class variable instance variable can also be accessed by turning the method into a property. The value cannot be passed. If you do not want to pass the value to see the following example, delete also under Def habit (self): print ("[%s] habit is Xxoo"%self.name) #往里面传值 @property def total_p        Layers (self): return self.__num @total_players. Setter def total_players (self,num): Self.__num = num Print ("Total players:", Self.__num) #删值 the @total_players. Deleter def total_players (self): print ("Total p Layer got delted ") del Self.num#animal.hobbie#animal.talk () # d = Animal (" Wangwang ") # D.walk () d = Animal (" Wangwang ") D.habitprint (D.total_players) d.total_players = 3d.__num = 9print ("Out__num:", D.__num) #del d.total_playersprint (d.total_players) 

　　

The difference between inheriting a classic class and a new class

#!/usr/bin/env python#-*-coding:utf-8-*-# B > C > A breadth First  from left to right from the same level to find, and then go to a   new class # B > A > C                   Depth First   Classic Class # The difference between the new class and the classic class is the difference between py2 and Py3, the same code with 2.7 is the depth first class A:                               #经典类 #class A (object):                       #新式类    n = "a"    def F2 ( Self):        print ("AF2") class B (A):    n = "B"    def F1 (self):        print ("B")    def F2 (self):        print ("B2 ") class C (A):    n =" C "    def F2 (self):        print (" C ") class D (b,c):    PASSD = d () #d. F1 () d.f2 () #面向对象特性之多态" __DOC__ Display class explanation annotation __del__ destruction method and so on after the execution of the unified destroy __call__ instantiation Plus () automatically execute the  call method without an egg __new__ the class rewrite, new calls Init   temporarily useless __dict_ The member variables of the _ class are displayed in the dictionary form.

　　

Methods for object-oriented private properties (plus two underscores) the difference between modern class classic classes