Python Singleton

Python Singleton

首先声明一个singleton装饰器

[code]#!/usr/bin/env python
# -*- coding: utf-8 -*-

def singleton(cls, *args, **kw):
    instances = {}

    def _singleton():
        if cls not in instances:
            instances[cls] = cls(*args, **kw)
        return instances[cls]

    return _singleton

使用@singleton注解在需要单例的类上标注

[code]#!/usr/bin/env python
# -*- coding: utf-8 -*-

@singleton
class Config:

    def __init__(self):
        pass

    def test(self):
        pass

测试

[code]#!/usr/bin/env python
# -*- coding: utf-8 -*-

config = Config()
config.test()
...