python 类属性和实例属性、方法 访问权限问题

 1 class Animal:
 2     cls_attr = 'cls_attr'
 3     _cls_attr = '_cls_attr'
 4     __cls_attr = '__cls_attr'
 5 
 6     def __init__(self):
 7         self.ins_attr = 'ins_attr'
 8         self._ins_attr = '_ins_attr'
 9         self.__ins_attr = '__ins_attr'
10         print('Animal __init__')
11 
12     def func(self):
13         print('func')
14 
15     def _func(self):
16         print('_func')
17 
18     def __func(self):
19         print('__func')
20 
21     def __del__(self):
22         print('Animal __del__')
23 
24 
25 class Dog(Animal):
26 
27     def __init__(self):
28         '''子类重写__init__函数时，需手动调用父类的__init__函数'''
29         print('Dog __init__')
30         super(Dog, self).__init__()
31 
32     def __del__(self):
33         print('Dog __del__')
34         super(Dog, self).__del__()
35 
36 
37 a = Animal()
38 print(a.cls_attr)
39 print(a._cls_attr)
40 # print(a.__cls_attr)
41 print(a._Animal__cls_attr)
42 print(a.ins_attr)
43 print(a._ins_attr)
44 # print(a.__ins_attr)
45 print(a._Animal__ins_attr)
46 a.func()
47 a._func()
48 # a.__func()
49 a._Animal__func()
50 del a
51 
52 print('-' * 50)
53 
54 d = Dog()
55 print(d.cls_attr)
56 print(d._cls_attr)
57 # print(d.__cls_attr)
58 print(d._Animal__cls_attr)
59 print(d.ins_attr)
60 print(d._ins_attr)
61 # print(d.__ins_attr)
62 print(d._Animal__ins_attr)
63 d.func()
64 d._func()
65 # a.__func()
66 d._Animal__func()
67 del d

 1 Animal __init__
 2 cls_attr
 3 _cls_attr
 4 __cls_attr
 5 ins_attr
 6 _ins_attr
 7 __ins_attr
 8 func
 9 _func
10 __func
11 Animal __del__
12 --------------------------------------------------
13 Dog __init__
14 Animal __init__
15 cls_attr
16 _cls_attr
17 __cls_attr
18 ins_attr
19 _ins_attr
20 __ins_attr
21 func
22 _func
23 __func
24 Dog __del__
25 Animal __del__