面向对象进阶

 1 class Animal(object):
 2     name = "hello"
 3 
 4     def __init__(self, name):
 5         self.name = name
 6         self.__num = 100
 7 
 8     @classmethod  # 类方法,只能访问类属性,不能调用实例属性
 9     def talk(self):
10         print("%s talk wang" % self.name)
11 
12     def walk(self):
13         print("%s walking now" % self.name)
14 
15     @staticmethod  # 静态方法,不能直接访问类属性,以及实例属性
16     def habbit(self):
17         print(" %s habbit ..." % self.name)
18 
19     @property  # 属性,将类方法变成类属性形式对外提供访问
20     def total(self):
21         print("total pro is %s" % self.__num)
22 
23     @property
24     def total_num(self):
25         print("total  num pro is %s" % self.__num)
26 
27     @total_num.setter
28     def total_num(self, num):  # 静态属性修改值,如果要修改,则必须传入一个参数
29         self.__num = num
30         print("total num  set is %s" % self.__num)
31 
32     @total_num.deleter
33     def total_num(self):
34         print("total num del is %s" % self.__num)
35         del self.__num
36 
37 newdog = Animal("san")
38 newdog.talk()
39 newdog.walk()
40 newdog.habbit(newdog)
41 print(newdog._Animal__num)
42 newdog.total
43 newdog.total_num
44 newdog.total_num = 3
45 del newdog.total_num
46 newdog.total_num  # 已经删除了该实例属性,所以不存在了,报错