Python编程之基础知识练习_006

练习内容：使用闭包函数模拟类实例

 1 __author__ = 'Orcsir'
 2 class ClosureInstance:
 3     def __init__(self, locals):
 4         self.__dict__.update(locals)
 5 
 6     def __len__(self):
 7         return self.__dict__["__len__"]()
 8 
 9 
10 def Stack():
11     items = []
12 
13     def push(item):
14         items.append(item)
15 
16     def pop():
17         items.pop()
18 
19     def __len__():
20         return len(items)
21 
22     dct = {}
23     for name, value in locals().items():
24         if callable(value):
25             dct[name] = value
26 
27     return ClosureInstance(dct)
28 # Test
29 s = Stack()
30 s.push(10)
31 s.push(20)
32 print(len(s))