设计模式

单例模式
class MySingleton:
    __obj = None
    __init_flag = True

    def __new__(cls, *args, **kwargs):
        if not cls.__obj:
            cls.__obj = super().__new__(cls)
        return cls.__obj

    def __init__(self, name):
        if MySingleton.__init_flag:
            print("Init ......")
            MySingleton.__init_flag = False
        self.name = name


s = MySingleton("nxr")
print(s.name)
s1 = MySingleton("jsm")
# print(s.name)
print(s1.name)