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

__author__ = 'Orcsir'
class ClosureInstance:
    def __init__(self, locals):
        self.__dict__.update(locals)

    def __len__(self):
        return self.__dict__["__len__"]()


def Stack():
    items = []

    def push(item):
        items.append(item)

    def pop():
        items.pop()

    def __len__():
        return len(items)

    dct = {}
    for name, value in locals().items():
        if callable(value):
            dct[name] = value

    return ClosureInstance(dct)
# Test
s = Stack()
s.push(10)
s.push(20)
print(len(s))