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本文實例為大家分享了python單例模式的具體代碼,供大家參考,具體內(nèi)容如下
多次實例化的結(jié)果指向同一個實例
單例模式實現(xiàn)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 __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文件里內(nèi)容: import settings class MySQL: print('run...') def __init__(self, ip, port): self.ip = ip self.port = port instance = MySQL(settings.IP, settings.PORT)
以上就是本文的全部內(nèi)容,希望對大家的學(xué)習(xí)有所幫助,也希望大家多多支持億速云。
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