这篇文章主要为大家详细介绍了python单例模式实例的相关资料，具有一定的参考价值，感兴趣的小伙伴们可以参考一下
本文实例为大家分享了python单例模式的具体代码，供大家参考，具体内容如下
多次实例化的结果指向同一个实例
单例模式实现方式
方式一:
import settings class MySQL: __instance = None def __init__(self, ip, port): self.ip = ip self.port = port @classmethod def from_conf(cls): if cls.__instance is None: cls.__instance = cls(settings.IP,settings.PORT) return cls.__instance obj1 = MySQL.from_conf() obj2 = MySQL.from_conf() obj3 = MySQL.from_conf() print(obj1) print(obj2) print(obj3)
方式二:
import settings def singleton(cls): _instance = cls(settings.IP, settings.PORT) def wrapper(*args, **kwargs): if args or kwargs: obj = cls(*args, **kwargs) return obj return _instance return wrapper @singleton class MySQL: def __init__(self, ip, port): self.ip = ip self.port = port obj1 = MySQL() obj2 = MySQL() obj3 = MySQL() print(obj1) print(obj2) print(obj3)
方式三:
import settings class Mymeta(type): def __init__(self, class_name, class_bases, class_dic): self.__instance = self(settings.IP, settings.PORT) def<strong style="color:transparent">来源gao@daima#com搞(%代@#码@网</strong> __call__(self, *args, **kwargs): if args or kwargs: obj = self.__new__(self) self.__init__(obj, *args, **kwargs) return obj else: return self.__instance class MySQL(metaclass=Mymeta): def __init__(self, ip, port): self.ip = ip self.port = port obj1 = MySQL() obj2 = MySQL() obj3 = MySQL() print(obj1) print(obj2) print(obj3)
方式四:
def f1(): from singleton import instance print(instance) def f2(): from singleton import instance,MySQL print(instance) obj = MySQL('1.1.1.1', '3389') print(obj) f1() f2() singleton.py文件里内容: import settings class MySQL: print('run...') def __init__(self, ip, port): self.ip = ip self.port = port instance = MySQL(settings.IP, settings.PORT)
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