Python简单的单例模式实现-线程不安全

Python简单单例模式-线程不安全

# -*- coding: utf-8 -*-
# @Time     :2020/6/24 10:17
# @Author   :12257
# @SoftWare :PyCharm


class Singleton:
    __instance = None

    def __new__(cls, *args, **kwargs):
        if cls.__instance is None:
            cls.__instance = super(Singleton, cls).__new__(cls, *args, **kwargs)
        return cls.__instance

if __name__ == '__main__':
    s1 = Singleton
    s2 = Singleton

    print(id(s1),id(s2))
    print(s1 is s2)