python - 单例模式，python例模式,单例模式：class

python - 单例模式，python例模式,单例模式：class

单例模式：

class Foo:    instance = None    def __init__(self,name):        self.name = name    @classmethod    def get_instance(cls):        #cls 类名        if cls.instance:            return cls.instance        else:            obj = cls(‘google‘)            cls.instance = obj            return objobj1 = Foo.get_instance()print(obj1)obj2 = Foo.get_instance()print(obj2)

out:

<__main__.Foo object at 0x00000000007D4278>
<__main__.Foo object at 0x00000000007D4278>

由上可知，obj1和obj2 内存地址都是一样的

python - 单例模式