Class methods and Class properties

The class method exists in order to modify the class properties.

code example:

class people (object):    address = "Shandong"              #类属性    #实例方法    def __init__ (self):        self.name = "Xiaowang"         # Instance properties        self.age =                   #实例属性    #类方法    @classmethod    def setnewaddress (CLS):        cls.address = "Inner Mongolia"    #可以通过类名的方式来获取类属性    #但是不能通过类名获取实例属性    #类对象, you can call the Class property directly, or you can call the class method #但是类对象 directly,    disallow the invocation of the instance property, and do not allow the invocation of the instance method    #如果是一个实例对象    #它可以获取实例属性和类属性的值, but only instance properties can be modified, class properties cannot be modified    #他还可以调用实例方法和类方法xiaoming = people () Xiaoming.setnewaddress () print (people.address) execution result: Inner Mongolia

code Example 2:

Class Animal (object):    def __init__ (self, name = "Animal", color = "white"):        self.name = name        Self.color = Colorclass Horse (Animal):    horsenum = 0            #类属性    def __init__ (self, name, color = ""):        super (). __INIT__ (name)        Self.sethorsenum ()    @classmethod    def sethorsenum (CLS):        cls.horsenum + = 1bailongma = Horse ("White Dragon Horse") print ( Bailongma.name) print (bailongma.color) print (bailongma.horsenum) Chituma = Horse ("Red Rabbit Horse") print (chituma.name) print ( Chituma.color) print (chituma.horsenum) execution result: White Dragon horse white 1 red rabbit horse White 2

　　

Class methods and Class properties