[已解决]关于《扩展阅读：Python Mixin 编程机制（转）》第三个插件方式的例子

void_island

1. class PlugIn(object):
   
2.     def __init__(self):
   
3.         self._exported_methods = []
   
4.         
   
5.     def plugin(self, owner):
   
6.         for f in self._exported_methods:
   
7.             owner.__dict__[f.__name__] = f
   
8. 
   
9.     def plugout(self, owner):
   
10.         for f in self._exported_methods:
    
11.             del owner.__dict__[f.__name__]
    
12. 
    
13. class AFeature(PlugIn):
    
14.     def __init__(self):
    
15.         super(AFeature, self).__init__()
    
16.         self._exported_methods.append(self.get_a_value)
    
17. 
    
18.     def get_a_value(self):
    
19.         print('a feature.')
    
20. 
    
21. class BFeature(PlugIn):
    
22.     def __init__(self):
    
23.         super(BFeature, self).__init__()
    
24.         self._exported_methods.append(self.get_b_value)
    
25. 
    
26.     def get_b_value(self):
    
27.         print('b feature.')
    
28.         
    
29. 
    
30. class Combine:pass
    
31. 
    
32. c = Combine()
    
33. AFeature().plugin(c)
    
34. BFeature().plugin(c)
    
35. 
    
36. c.get_a_value()
    
37. c.get_b_value()

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没有理解具体怎么运作，求大佬尽量详细解析。。。

最佳答案

月排行榜 / 总排行榜

Stubborn

2020-6-5 12:35:12

1. c = Combine()
   
2. AFeature().plugin(c)
   
3. 
   
4. class AFeature(PlugIn):
   
5.     def __init__(self):
   
6.         super(AFeature, self).__init__()
   
7. 
   
8. class PlugIn(object):
   
9.     def __init__(self):
   
10.         self._exported_methods = []
    
11. 
    
12. self._exported_methods.append(self.get_a_value)
    
13. 
    
14.     def plugin(self, owner): #  这里的owner,就是Combine的实例化对象
    
15.         for f in self._exported_methods:
    
16.             owner.__dict__[f.__name__] = f

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跳转到最佳答案楼层

Stubborn

1. c = Combine()
   
2. AFeature().plugin(c)
   
3. 
   
4. class AFeature(PlugIn):
   
5.     def __init__(self):
   
6.         super(AFeature, self).__init__()
   
7. 
   
8. class PlugIn(object):
   
9.     def __init__(self):
   
10.         self._exported_methods = []
    
11. 
    
12. self._exported_methods.append(self.get_a_value)
    
13. 
    
14.     def plugin(self, owner): #  这里的owner,就是Combine的实例化对象
    
15.         for f in self._exported_methods:
    
16.             owner.__dict__[f.__name__] = f

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void_island

Stubborn 发表于 2020-6-5 12:35

大致能理解，感谢