python 单例模式

# 单例模式
class B:
    __instance = None

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

    def __init__(self, name, age):
        self.name = name
        self.age = age

    def func(self):
        print(self.name)


a = B(‘alex‘, 80)  # 实例化,传值
b = B(‘egon‘, 20)  # 实例化,覆盖值
print(a)
print(b)
print(a.name)
print(b.name)

python 单例模式

原文：https://www.cnblogs.com/Jehold/p/11125840.html