类属性

 1 class Demo_Property:
 2     class_name = "Demo_Property"
 3 
 4     def __init__(self,x=0):
 5         self.x=x
 6 
 7     def class_info(self):
 8         print(‘类变量值：‘,Demo_Property.class_name)
 9         print(‘实例变量值：‘,self.x)
10 
11     def chng(self,x):
12         self.x=x
13 
14     def chng_cn(self,name):
15         Demo_Property.class_name = name
16 dpa=Demo_Property()
17 dpb=Demo_Property()
18 print(‘初始化这两个实例‘)
19 dpa.class_info()
20 dpb.class_info()
21 print(‘修改实例变量‘)
22 print(‘修改dpa实例变量‘)
23 dpa.chng(3)
24 dpa.class_info()
25 dpb.class_info()
26 print(‘修改dpb实例变量‘)
27 dpb.chng(10)
28 dpa.class_info()
29 dpb.class_info()
30 print(‘修改类变量‘)
31 print(‘修改dpa类变量‘)
32 dpa.chng_cn(‘dpa‘)
33 dpa.class_info()
34 dpb.class_info()
35 print(‘修改dpb实例变量‘)
36 dpb.chng_cn(‘dpb‘)
37 dpa.class_info()
38 dpb.class_info()